Approve

ISA–RP

R E C O M M E N D E D P R A C T I C E

60.6–1984

Nameplates, Labels, andTags for Control Centers

d 28 February 1984

Copyright 1984 by the Instrument Society of America. All rights reserved. Printed in the UnitedStates of America. No part of this publication may be reproduced, stored in a retrieval system, ortransmitted in any form or by any means (electronic, mechanical, photocopying, recording, orotherwise), without the prior written permission of the publisher.

ISA67 Alexander DriveP.O. Box 12277Research Triangle Park, North Carolina 27709

ISA–RP60.6–1984, Nameplates, Labels, and Tags for Control Centers

ISBN 0-87664-813-8

Preface

This preface is included for information purposes and is not a part of ISA-RP60.6-1984.

This Recommended Practice has been prepared as a part of the service of ISA toward a goal of uniformity in the field of instrumentation. To be of real value, this document should not be static, but should be subject to periodic review. Toward this end, the Society welcomes all comments and criticisms, and asks that they be addressed to the Secretary, Standards and Practices Board, ISA, 67 Alexander Drive, P.O. Box 12277, Research Triangle Park, NC 27709, Telephone (919) 549-8411, e-mail: standards@isa.org.

The ISA Standards and Practices Department is aware of the growing need for attention to the metric system of units in general, and the International System of Units (SI) in particular, in the preparation of instrumentation standards. The Department is further aware of the benefits to U.S.A. users of ISA standards of incorporating suitable references to the SI (and the metric system) in their business and professional dealings with other countries. Toward this end, this Department will endeavor to introduce SI-acceptable metric units in all new and revised standards to the greatest extent possible. The Metric Practice Guide, which has been published by the Institute of Electrical and Electronic Engineers as ANSI/IEEE Std. 268-1982, and future revisions will be the reference guide for definitions, symbols, abbreviations, and conversion factors.

It is the policy of ISA to encourage and welcome the participation of all concerned individuals and interests in the development of ISA standards. Participation in the ISA standards-making process by an individual in no way constitutes endorsement by the employer of that individual, of the ISA, or of any of the standards that ISA develops.

The SP60 Committee is preparing a series of recommended practices on control centers. ISA-RP60.6 is the third of this series to be published. The published recommended practices and drafts in preparation are listed below:

RECOMMENDED PRACTICE

SECTION TITLE

dRP60.1* Control Center (C.C.) FacilitiesdRP60.2* C.C. Design Guide and TerminologydRP60.3* Human Engineering for Control CentersdRP60.4* Documentation for Control CentersdRP60.5* Control Center Graphic DisplaysRP60.6 Nameplates, Labels, and Tags for Control Centers

dRP60.7* Control Center ConstructionRP60.8 Electrical Guide for Control Centers (published 1978)RP60.9 Piping Guide for Control Centers (published 1981)

dRP60.10* Control Center Inspection and TestingdRP60.11* Crating, Shipping and Handling for C.C.

*Draft Recommended Practice, for additional information on the status of this document contact ISA Headquarters.

ISA-RP60.6-1984 3

The persons listed below served as active members of the ISA Control Centers Committee for the major share of its working period.

NAME COMPANY

H. R. Solk, Chairman ConsultantJ. M. Fertitta, Secretary The Foxboro CompanyA. R. Alworth Shell Oil CompanyC. D. Armstrong Tennessee Valley AuthorityF. Aured Panels, Inc.B. W. Ball Brown & Root, Inc.R. W. Borut* The M. W. Kellogg CompanyC. Goding BIF Sanitrol, Unit of Gen. SignalT. P. Holland Johnson Controls, Inc.-Panel UnitJ. F. Jordon Monsanto CompanyJ. G. McFadden Public Service Electric & GasR. Munz Mundix Control Systems, Inc.R. F. Rossbauer Fischer & PorterA. Stockmal ContravesM. J. Walsh Procon, Inc.R. L. Welch El Paso Natural Gas Company

The persons listed below served as corresponding members of the ISA Control Centers Committee for the major share of its working period:

NAME COMPANY

J. Cerretani Detroit Edison CompanyN. L. Conger ConocoL. Corsetti Crawford & Russell, Inc.T. J. Crosby Robertshaw Controls CompanyC. R. Davis EngineerJ. M. Devenney RetiredF. L. Durfee Swanson Engineering & Manufacturing H. P. Fabisch Fluor Engineering & Constructors, Inc.J. Farina Gismo Div. of Guarantee Electric CompanyH. L. Faul A-E Development CorporationM. E. Gunn Swanson Engineering & ManufacturingR. E. Hetzel Stauffer Chemical CompanyR. I. Hough Hough AssociatedJ. R. Jordon International Paper CompanyH. Kamerer Wilmington Steel Metal Ind. A. Kayser Consolidated Controls CorporationJ. L. Kern Weyerhauser CompanyR. W. Kief Emanon CompanyA. L. Kress 3M CompanyR. A. Landthorn Panels,Inc.A. J. Langelier EngineerC. S. Lisser* Oak Ridge National LaboratoryS. F. Luna General Atomics Company

*Chairman Emeritus

4 ISA-RP60.6-1984

R. G. Marvin Dow Chemical CompanyA. P. McCauley, Jr. Chagrin Valley Controls, Inc.W. B. Miller Moore Products CompanyC. W. Moehring BechtelD. P. Morrison BIF/General SignalR. L. Nickens Reynolds Metal CompanyF. W. Reichert EngineerI. Stubbs Panelmatic,Inc.J. F. Walker Honeywell, Inc.G. Walley The N/P CompanyS. J. Whitman Acco/Bristol DivisionW. T. Williams Instrumentation EngineerW. J. Wylupek Moore Products Company

This Recommended Practice was approved for publication by the ISA Standards and Practices Board in February 1984.

NAME COMPANY

W. Calder III, Chairman The Foxboro CompanyN. L. Conger ConocoB. Feikle Bailey Controls CompanyT. J. Harrison IBM CorporationH. S. Hopkins Westinghouse Electric Company J. L. Howard Boeing Aerospace CompanyR. T. Jones Philadelphia Electric CompanyR. Keller The Boeing CompanyO. P. Lovett, Jr. Isis CorporationE. C. Magison Honeywell, Inc.A. P. McCauley Chagrin Valley Controls, Inc.J. W. Mock Bechtel CorporationE. M. Nesvig ERDCO Engineering CorporationR. Prescott Moore Products CompanyD. Rapley Stearns Catalytic CorporationW. C. Weidman Gilbert Commonwealth, Inc.K. A. Whitman Allied Chemical CorporationP. Bliss**B. A. Christensen**L. N. Combs**R. L. Galley**R. G. Marvin**W. B. Miller** Moore Products CompanyG. Platt** Bechtel Power CorporationJ. R. Williams** Stearns Catalytic Corporation

**Director Emeritus

ISA-RP60.6-1984 5

Contents

1 Purpose .............................................................................................................................. 9

2 Scope ................................................................................................................................. 9

3 Functional definitions ....................................................................................................... 9

4 Identification .................................................................................................................... 10

5 Types of identification .................................................................................................... 11

6 Materials .......................................................................................................................... 11

7 Methods of fabrication ................................................................................................... 12

8 Methods of attachment ................................................................................................... 13

9 Typical locations ............................................................................................................. 14

Appendix A Control center examples A-1 ........................................................................ 15

Appendix A Nameplates (usable area) A-2 ....................................................................... 16

Appendix A Nameplate letter size and spacing guide A-3 ............................................. 17

Appendix A Nameplate letter size and spacing guide A-3 (cont.) .................................. 18

Appendix A Wire terminal identification A-4 .................................................................... 19

Appendix B Abbreviations ................................................................................................. 20

Appendix C Character heights .......................................................................................... 41

Appendix D Gothic lettering examples ............................................................................. 42

ISA-RP60.6-1984 7

1 Purpose

The purpose of this Recommended Practice is to assist the designer or engineer in choosing and specifying the method of identifying items mounted on a control center or associated with a control center facility.

2 Scope

This Recommended Practice is intended to summarize identification methods and to suggest the uses of nameplates, labels, and tags. Examples are included for guidance in preparing drawings and specifications. (See Appendix A.) Since materials will determine the tools and techniques used, savings may be realized by using the materials and symbols standardized by the control center manufacturer selected—provided that the materials fully satisfy the application and purpose intended.

3 Functional definitions

3.1 Nameplate: Used to display basic information, including function.

3.2 Label: Used to inform of detailed instructions about item identified.

FRC-104OIL TO BURNER 4

FLOWUNIT AND/OR

FUNCTION

EXAMPLE:

NOTICE AND/ORTECHNICAL

INFORMATION

EXAMPLE:

CAUTIONCONTAINS STATIC

SENSITIVECOMPONENTS

ISA-RP60.6-1984 9

3.2.1 Tags: Used to display specific information about item identified.

4 Identification

4.1 The effectiveness of controls and displays depends upon identification. Therefore, this iden-tification should be positioned as close as is practical to its respective item. The location of the identification in relation to the item should be consistent throughout the control center to minimize confusion for operation, maintenance, and testing.

4.2 Identification lettering should be oriented horizontally and centered or left-justified. The min-imum spacing between words should be the width of the letter "E." The spacing between the bottom of a line of lettering and the top of the following line should be a minimum of 40 percent and a maximum of 66 percent of the letter height. (See Appendix A for recommended spacing.)

4.3 Similar types of identification on controls and displays should have the same height letters with uniform stroke width. (See Appendix B for abbreviations and Appendix C for letter height recommendations.)

4.4 Letters should preferably be black or white on a sharply contrasting background, upper case (capital letters are preferred). Dark letters on light background will minimize illegibility from dirt buildup in the engraved letters. The condensed gothic style of letters is usually the easiest to read. (See Appendix D.)

4.5 Background color may be used to emphasize separate but related functions. (See ISA-RP60.3 Human Engineering for Control Centers.) The most legible combination of letter color and back-ground color should be used in lieu of using one letter color on all background colors.

4.6 When manufacturers' standards are not suitable, the material, type, and method of attachment of the identification should be specified.

INSTRUMENT WIREOR LOOP NUMBER

EXAMPLE:

XFRC-104

10 ISA-RP60.6-1984

5 Types of identification

5.1 The type and method of identification should be standardized early in the design to ensure consistency.

5.2 Nameplates are one of the most common types of identification and are used mostly on panels and displays. Nameplates are normally adjacent to the instruments to be identified. Nameplates may also be used in the back of panels to aid assembly, maintenance, and troubleshooting.

5.3 Labels made of flexible material may be used in all of the above situations and are especially useful on irregular surfaces (instrument bodies, etc.).

5.4 Tags are suitable for identifying interconnecting piping and wiring. Tags may be fastened with wire or plastic ties when other methods of attachment are not acceptable. (See Appendix A.)

5.5 Terminal identification for wiring or tubing is necessary for installation, maintenance, and troubleshooting. See Table 1 for a summary of processes used in terminal identification.

6 Materials

6.1 Most materials that can be cut or shaped can be used for identification purposes. Some of the most common materials used are metals, plastics, and laminated stocks. Nameplates are frequently made from laminated engraving stock.

6.2 Metals are used in making nameplates and tags. Aluminum, brass, steel, tinplate, and stainless steel are commonly used in embossing, engraving, stamping, and photoetching processes. Metals can be painted many different colors with chemical-resistant, baked enamel or epoxy paints.

6.3 Plastics are used in making nameplates, tags, and terminal identifications. A transparent plastic engraving stock, such as acrylic, rigid vinyl, and polycarbonate, is generally coated with paint on the back surface and engraved from the back side. The engraved area is then filled with a contrasting color paint.

6.4 Laminated engraving stocks have a contrasting color center core. A wide range of colors are available. Using an engraving machine, the characters are transferred to the stock by routing out the top colored layer to expose the contrasting color core. Laminated engraving stocks are available in various thicknesses and may be cut to the final nameplate size from sheet stock.

6.5 Heavy paper or fabric tags with handwritten or typed descriptions have uses as temporary identification if permanent methods are not available or desirable at the time of their installation.

6.6 The choice of materials used for identification may depend on the environment of the service. For instance, ultraviolet radiation from direct sunlight and heat can cause certain types of plastics to deteriorate.

ISA-RP60.6-1984 11

7 Methods of fabrication

7.1 There are various acceptable methods of making nameplates, labels, and tags for identification of controls and displays, including the following processes:

7.1.1 Etching is a process of engraving lines in plates by means of acid. Etchings can be made on copper, steel, and glass, with copper being the most frequently used material.

7.1.2 Engraving is a method of carving words or designs on the surface of metal or plastics.

7.1.3 Painting is a process utilizing any kind of paint in various colors to cover almost any surface with designs and words.

7.1.4 Stenciling is a process of reproducing designs or letters on most surfaces by passing a brush wet with ink or paint over a stencil. A stencil is a thin sheet of metal or other material with lines and dots cut into it to form a pattern.

7.1.5 Silk screening is a means of printing with stencils on almost any surface. Almost any kind of ink or paint can be used in the process. Bolting cloth (stencil silk) is stretched across a frame, and a stencil pattern is applied to this supporting surface. A squeegee is used to force the ink or paint through the open areas of the stencil.

7.1.6 Typing is a common method used to produce printed characters on paper or other material.

7.1.7 Photo-etching is a photographic process of superimposing lines or designs, in color, perma-nently to anodized aluminum.

7.1.8 Embossing is a process in which a raised design is stamped or pressed by mechanical means on the surface of metal, paper, or plastic.

7.1.9 Stamping is the process of imprinting or making impressions by the use of a die or other stamping tools.

7.2 Each of the above processes has a certain cost vs. longevity ratio and should be selected on the basis of best serving the purpose desired.

12 ISA-RP60.6-1984

Table 1 — Identification types

8 Methods of attachment

8.1 The most common methods of attachment are mechanical and adhesive.

8.2 Mechanical methods of attachment of nameplates, labels, and tags directly to the surface of an item by non-corrosive rivets, screws, brads, or clamps can be considered permanent. Wrap-around loops of chain, wire, and plastic ties can also be used for securing identification directly to the item to be identified.

8.3 Adhesives are available to attach nameplates to clean, smooth surfaces. The same purpose may be served by using double-faced pressure-sensitive tape. The permanence of adhesives is dependent upon the conditions to which they are subjected. A hostile and changing environment is the natural enemy of the adhesive method of attaching nameplates, and the permanence of the adhesive method is directly related to environmental exposure.

8.4 One of the considerations in choosing the method of attachment may be the desired degree of permanence. There may be instances where anticipated future revisions would sway the se-lection to a method of attachment that allows easy removal.

Process Nameplates Labels Tags Terminal

Identification *

*See Section 5 Types of Identification for terminal identification.

Etching X X

Engraving X X X

Painting X X X X

Silk Screening X X

Stenciling X X

Typing X X X X

Photo-etching X X

Lithography X X

Embossing X X

Stamping X X X

ISA-RP60.6-1984 13

9 Typical locations

9.1 Identification of instruments and controls on the face of a control center may be used to make clear the relationship between systems and their subsystems. An example is shown in Appendix A (A-1).

9.2 Typical nameplates are shown in Appendix A (A-2). After the identification wording is select-ed and the size of lettering and number of lines are chosen, the overall dimensions of the name-plate may be selected using Appendix A (A-3). To aid in operator recognition, it may be desirable to identify similar types of devices or functions with the same size of nameplate. It is not recom-mended, however, that one size of nameplate be routinely used for all devices and functions without regard to the space actually required by the lettering in each case.

9.3 Typical wire terminal identifications are shown in Appendix A (A-4). Wiring schedules should establish the identification method used.

9.4 Control Center components that may be removed for maintenance should, as a minimum, have their permanent mounting locations identified. The removable component may also be iden-tified.

14 ISA-RP60.6-1984

Appendix A — Control center examples A-1

ISA-RP60.6-1984 15

Appendix A — Nameplates (usable area) A-2

16 ISA-RP60.6-1984

Appendix A — Nameplate letter size and spacing guide A-3

Based on gothic style letters with stroke width of 1/6th to 1/8th of character height.

ISA-RP60.6-1984 17

Appendix A — Nameplate letter size and spacing guide A-3 (cont.)

Based on gothic style letters with stroke width of 1/6th to 1/8th of character height.

18 ISA-RP60.6-1984

Appendix A — Wire terminal identification A-4

ISA-RP60.6-1984 19

Appendix B — Abbreviations

Where possible, abbreviations should be avoided. Where abbreviations are used they should be consistent throughout the control center. One abbreviation should not have more than one meaning.

The following Table of Abbreviations is representative only and is not intended to be either mandatory or complete.

Advance........................................ADV

- A -Abandoned ...................................ABNDAbbreviate ....................................ABBR Abnormal ......................................ABNL About ............................................ABT Above ...........................................ABV Absolute........................................ABS Absorber .......................................ABRAbsorptive.....................................ABSV Abutment ......................................ABUT Accelerate.....................................ACCEL Acceleration (due to gravity).........G Acceleration (in general)...............A Access Opening ...........................AO Access Panel................................AP Accessory .....................................ACCESS Account.........................................ACCTAccumulate...................................ACCUMAccumulator..................................ACCAcetylene......................................ACETAcidproof .....................................APAcoustic ........................................ACST Acre ..............................................ACAcre-foot .......................................AC-FTActivation ......................................ACTNActual............................................ACTLActual Cubic Foot (per min.).........ACFMActuate .........................................ACTEActuating.......................................ACTGActuator ........................................ACTRAdapter .........................................ADPTAddition.........................................ADDAdditive.........................................ADDTAdhesive.......................................ADHAdjust............................................ADJ

After .............................................AFTAfternoon ......................................PMAggregate .....................................AGGRAgitator .........................................AGTRAir Blast ........................................ABAir Blast Circuit Breaker................ABCBAir Blast Transformer....................ABTAir Break Switch ...........................ABSAir Circuit Breaker.........................ACBAir Condition .................................AIR COND, A/CAir Conditioning

(Cooling-Heating System).........A/CSAir Conditioning Unit .....................A/CUAir Cooled .....................................AIR CLDAir Handling Unit...........................AHUAirborne ........................................ABNAirplane.........................................APLAir Supply .....................................A/SAirtight...........................................ATAlarm ............................................ALMAlarm Check Valve ......................ACVAlcohol ..........................................ALCAlkaline ........................................ALKAlloy .............................................ALYAlphanumeric Keyboard ..............ANKAlteration ......................................ALTRNAlternate ......................................ALTAlternating Current .......................ACAlternator ......................................ALTNTRAltitude..........................................ALTAluminum .....................................ALAmber ...........................................AMBAmbient ........................................AMBAmerican Wire Gage ....................AWGAmmeter .......................................AM

20 ISA-RP60.6-1984

Amount .........................................AMTAmpere ........................................A, AMPAmpere-hour.................................AHAmperes per Centimeter

per°F ......................................A/CM/°/FAmpere per Meter.........................A/MAmpere Turn.................................ATAmplifier .......................................AMPLAmplitude .....................................AMAmplitude Modulation ..................AMAnalog Control Output ..................ACOAnalog Status Input .....................ASIAnalog Status Output ..................ASOAnalog-to-Digital ...........................A/DAnalog-to-Digital Converter ..........ADCAnalysis ........................................ANALAnalyzer........................................ANALZAnd So Forth ................................ETCAngstrom ......................................AAnhydrous ....................................ANHYDAnnulus.........................................ANNSAnnunciator ..................................ANNAnode ...........................................AAntenna ........................................ANTApartment .....................................APTApparatus .....................................APPArea..............................................AArmature.......................................ARMArmored........................................ARMDArrange.........................................ARRArrangement.................................ARRGTArrester.........................................ARRArtificial .........................................ARTAssembly ......................................ASSYAssistant .......................................ASSTAssociate ......................................ASSOCAtmosphere ..................................ATMAtomic...........................................ATAttach ...........................................ATTAttention .......................................ATTNAttenuator .....................................ATTENAudible..........................................AUDAudio Frequency ..........................AFAuthorized ....................................AUTHAutomatic......................................AUTOAutomatic Brightness Control .......ABCAutomatic Door Seal.....................ADS

Automatic Check Valve.................ACVAutomatic Dispatch System..........ADSAutomatic Frequency Control .......AFCAutomatic Gain Control.................AGCAutomatic Noise Limiter................ANLAutomatic Sensitivity Control ........ASCAutomatic Volume Control ............AVCAutomatic Volume Expansion.......AVEAutotransformer ............................AUTOXFMRAuxiliary ........................................AUXAuxiliary Area................................AAAuxiliary Building ..........................AUXBLDGAuxiliary Control Panel .................ACPAuxiliary Control Room.................ACRAuxiliary Feedwater ......................AFWAuxiliary Feedwater Pump............AFWPAuxiliary Oil Pump ........................AOPAuxiliary Relay ..............................ARAverage ........................................AVGAverage Power Range

Monitoring..............................APRMAviation .........................................AVIAvoirdupois ...................................AVDPAzimuth.........................................AZ

- B -Back Flow Prevention Valve .........BPVLVBack Gear.....................................BGBack Pressure ..............................BPBack Pressure Control..................BPCBack Pressure Valve ....................BPVBack Wash....................................BWBack Water Valve .........................BWVBacteriological .............................BACTBaffle ............................................BAFBalance ........................................BALBalance of Plant ...........................BOPBallast ..........................................BALLBandwidth ....................................BBank .............................................BKBarometer ....................................BARBarrel ............................................BBLBarrels Per Day ...........................BPDBarrels Per Hour ..........................BPHBarrier ..........................................BARRBase Group ..................................BGBasement .....................................BSMT

ISA-RP60.6-1984 21

Basic Network ..............................BAS NETBattery .........................................BATBaume .........................................BEBeacon .........................................BCNBeam ............................................BMBearing .........................................BRGBeat Frequency Oscillator ............BFOBedplate .......................................BDPLTBell Alarm Switch..........................BASWBelow............................................BELBelt Conveyor ...............................BCBending Moment ..........................MBessemer .....................................BESSBetween........................................BETBinary Coded Decimal..................BCDBinary Input Multiplexer ................BIMBinary Output Multiplexer .............BOMBituminous....................................BITBlack.............................................BLK, BKBlank.............................................BLKBlasting Powder............................BLSTGPWDBlock.............................................BLKBlower...........................................BLOBlow Down....................................BLWDNBlowoff..........................................BOBlowout Coil..................................BOCBlue ..............................................BLU, BLBlueprint .......................................BPBoard ............................................BDBoiler ............................................BLRBoiler Feed ...................................BFBoiler Feed Booster Pump ...........BFBPBoiler Feed Pump.........................BFPBoiler Feed Pump Turbine............BFPTBoiler Feed Water.........................BFWBoiler Horsepower ........................BHPBoiler House.................................BHBoiler Pressure .............................BPBoiling Point..................................BPBoiler Water Reactor ....................BWRBooster .........................................BSTRBorrow ..........................................BORBorrowed Light .............................BLTBose

Chaudhuri-Hocquenghem ........BCHBottled ..........................................BTLBottom ..........................................BOT

Bottom Layer ................................BLBoulder .........................................BLDRBoundary ......................................BDYBracket..........................................BRKTBrake ............................................BKBrake Horsepower ........................BHPBrake Horsepower-Hour ...............BHP-HRBrake Mean Effective Pressure ....BMEPBranch ..........................................BRBreak ............................................BRKBreaker .........................................BKRBreeder .........................................BDRBridge ...........................................BRDGBrightness.....................................BRTBritish Thermal Units ....................BTUBritish Thermal Units per Hour .....BTUHBritish Thermal Units per Hour

(thousand).................................MBHBrown............................................BRN, BRBrush ............................................BRBubbler .........................................BUBLRBuffer ............................................BUFBuilding .........................................BLDGBuilding Heating System...............BHSBulkhead.......................................BHDBundle...........................................BDLBus Tie..........................................BTBushing Current Transformer .......BCTButterfly Valve...............................BTFLY VLVButton ...........................................BUTBuzzer...........................................BUZBy-pass.........................................BYPBy-pass Handwheel Motor............BPHMBy-pass Handwheel Switch ..........BPHS

- C -Cabinet .........................................CABCable ............................................CACadmium Plate .............................CD PLCalculate.......................................CALCCaliber ..........................................CALCalibrate .......................................CALCalorie ..........................................CALCamber .........................................CAMCamera.........................................CAMRCandlepower.................................CPCapacitor ......................................CAP

22 ISA-RP60.6-1984

Capacity........................................CAPCapital ..........................................CAPCarbon Dioxide.............................CO2

Carbon Dioxide Storage, Fire Protection and Purging Sys...CO2S

Carbon Monoxide .........................COCarload.........................................CLCarriage........................................CRGCarrier...........................................CARRCarrier Current..............................CARR CURCarton...........................................CTNCasing ..........................................CSGCast (used with other materials)...CCast Iron .......................................CICast Iron Pipe...............................CIPCast Iron Soil Pipe........................CISPCast Steel .....................................CSCasting .........................................CSTGCatalogue .....................................CATCatch Basin ..................................CBCathode-ray Tube.........................CRTCaustic..........................................CAUSCavitation......................................CAVITCavity............................................CAVCeiling...........................................CLGCelsius..........................................CCement .........................................CEMCenter...........................................CTRCenter Line ...................................CLCenter Matched............................CMCenter of Buoyancy ......................CBCenter of Floatation ......................CFCenter of Gravity ..........................CGCenter of Pressure .......................CPCenter Tap....................................CTCentigrade

(obsolete, use Celsius)..............CCentigram.....................................CGCentimeter ....................................CMCentimeter-gram-second

System ......................................CGSCentral Lubricating Oil System.....CLOSCentral Processing Unit................CPUCentrifugal ....................................CNTFGLCentrifugal Force ..........................CFCeramic ........................................CERChain ............................................CH

Chain Grate ..................................CGChamber .......................................CHBRChamfer ........................................CHFRChange .........................................CHGChange Notice ..............................CNChange Order ...............................COChannel ........................................CHANCharge..........................................CHGCharger.........................................CHGRCheck............................................CHKCheck Valve..................................CVChemical.......................................CHEMChemical Addition Tank................CATChemical Cleaning System...........CHCSChemically Pure............................CPChilled Water ................................CHWChilled Water Return ....................CWRChilled Water Supply ....................CWSChlorination...................................CLNCircle.............................................CIRCircuit............................................CKTCircuit Breaker ..............................CBCircular .........................................CIRCircular Mil....................................CMILCircular Mils, Thousands ..............KCMILCircular Pitch ................................CPCirculating Water Pump................CWPClamp ...........................................CLPClass.............................................CLCleanout .......................................COClear .............................................CLRClearance .....................................CLClevis ............................................CLVClockwise......................................CWClosed...........................................CLSDClosed-Circuit Television ..............CCTVClosing..........................................CLClosing Coil...................................CCClutch............................................CLCoated ..........................................CTDCoaxial..........................................COAXCode, Alarm, Paging.....................CAPCode Call ......................................CCCode Call Alarm and Paging ........CCAPCoefficient.....................................COEFCold Water....................................CWCollector........................................COLL

ISA-RP60.6-1984 23

Column .........................................COLCombination .................................COMBCombine .......................................COMBCombustion ..................................COMBCommercial ..................................COMLCommon.......................................COMCommon Battery...........................CBCommunication.............................COMMCommutator..................................COMMCommutator End ..........................CECompany ......................................COCompare.......................................CMPRCompartment................................COMPTCompensate .................................COMPComplete ......................................COMPLComponent ...................................CMPNTComponent Cooling......................CCComponent Cooling System.........CCSComposite ....................................CXComposition..................................COMPCompound....................................CMPDCompress .....................................CPRSCompressed Air............................CACompressor ..................................CPRSRComputation .................................COMPComputer......................................COMPConcentrate ..................................CONCConcrete .......................................CONCCondensate ..................................CNDSCondensate System .....................CSCondenser ....................................CONDCondenser Circulating Water .......CCWCondenser Circulating

Water Pump ..............................CCWPCondenser Circulating

Water Pump Station ..................CCWPSCondenser Circulating

Water System............................CCWSCondition ......................................CONDConductivity ..................................CNDCTConductor .....................................CNDCTConfiguration ................................CFGNConnector .....................................CONNConstant .......................................CONSTConstant Current Transformer......CCTConstruction .................................CONSTRContact .........................................CONT

Contactor ......................................CNTORContainer ......................................CNTNRContainment .................................CNTMTContaminated ...............................CONTAMContinue, Continuous ...................CONTContract ........................................CONTRContractor .....................................CONTRContrast ........................................CTRSControl ..........................................CONTControl Building ............................CONT BLDGControl Element Assembly ...........CEAControl Relay ................................CRControl Rod Drive .........................CRDControl Rod Drive System ............CRDSControl Station ..............................CONT STAControl Switch...............................CSControl Valve ................................CVController ......................................CONTConverter ......................................CONVConveyor ......................................CNVRCoolant .........................................COOLCooled ..........................................CLDCooler ...........................................CLRCooling..........................................CLGCooling Coil ..................................CCCooling Towers.............................CTCooling Water ...............................CWCorner ..........................................CORCorrect, Correction .......................CORRCorrespond...................................CRSPCotton ...........................................COTCoulomb .......................................CCounter .........................................CNTRCounterclockwise..........................CCWCounterbalance ............................CBALCounterweight...............................CTWTCoupling........................................CPLGCover ............................................COVCrank ............................................CRKCrankcase.....................................CRKCCritical Path Method .....................CPMCross Arm.....................................XARMCross Beam..................................XBEAMCross Connection .........................XCONNCross Road...................................XRDCrossbar .......................................XBARCrosstie.........................................XTIE

24 ISA-RP60.6-1984

Cruising ........................................CRUISCrushed........................................CRCrystal ..........................................XTALCubic ............................................CU

Cubic Centimeter..........................CM3, CC

Cubic Feet ....................................FT3,CU FTCubic Feet Per Minute..................CFMCubic Feet Per Second ................CFS

Cubic Inch..................................... IN3, CU IN.

Cubic Meter ..................................M3, CU MCubic Micrometer .........................CU MU

Cubic Millimeter ............................MM3, CU MM

Cubic Yard....................................YD3, CU YDCurrent..........................................CURCurrent Directional Relay .............CDRCurrent Transformer .....................CTCurrent to Current......................... I/ICurrent to Pneumatic.................... I/PCurrent to Voltage ........................ I/ECustomer ......................................CUSTCut Down......................................CDCut Out .........................................COCycle.............................................CCycles Per Minute ........................CPMCylinder ........................................CYL

- D -Damper.........................................DMPRDash Pot.......................................DPDeadweight...................................DWTDeaerating Feed Tank..................DFTDecay ...........................................DCADecibel..........................................DBDecimal.........................................DECDecimeter .....................................DMDeck .............................................DKDecrease ......................................DECRDeflect ..........................................DEFL

Degree ...................................°, DEG

Dehumidifier .................................DHMRDelayed Automatic

Volume Control..........................DAVCDelineation....................................DELDeliver ..........................................DELIVDemand Indicator .........................DIDemand Meter..............................DM

Demineralizer................................DMNRLZRDemodulator .................................DEMDensity..........................................DDescribe........................................DESCRDesignation...................................DESIGDetector ........................................DETDevelop.........................................DEVDevelopment.................................DEVDeviation.......................................DEVNDevice...........................................DVDew Point .....................................DPDew Point Temperature................DPTDiagonal........................................DIAGDiagram ........................................DIAGDiameter .......................................DIADiaphragm ....................................DIAPHDiesel............................................DSLDiesel Generator...........................DGDiesel Generator Building.............DGBDiesel Oil ......................................DODifferential.....................................DIFFDifferential Expansion Detector ....DXDDifferential Pressure .....................DPDifferential Temperature ...............DIFF TDifferential Time Relay .................DIFF TRDigital-to-Analog Converter ..........DACDimension.....................................DIMDirect Connected ..........................DIR CONNDirect Current ...............................DCDirection........................................DIRDirector .........................................DIRDischarge......................................DISCHDisconnect ....................................DISCDiscriminator.................................DISCRDispatch........................................DISPDisplay Generator.........................DGDisposal ........................................DPSLDissolved Oxygen.........................DODistance........................................DISTDistill .............................................DSTLDistillate ........................................DSTLTDistilled Water...............................DWDistribute.......................................DISTRDistrict...........................................DISTDistrict Engineer ...........................DEDitto ..............................................DODiverter .........................................DIV

ISA-RP60.6-1984 25

Divide............................................DIVDivision .........................................DIVDolomite........................................DOLMDoor ..............................................DRDoor Post......................................DPDouble ..........................................DBLDouble Acting ...............................DADouble Feeder ..............................DFDouble Glass ................................DGDouble Groove (insulators)...........DGDouble Pole Double Throw...........DPDTDouble Pole, Single Throw ...........DPSTDoubler .........................................DBLRDown.............................................DNDownscale ....................................DNSDownspout....................................DSDownstream..................................DNSTRDrain .............................................DRDrainage .......................................DRDrawing.........................................DWGDrawing List ..................................DLDrawn ...........................................DRWNDrive .............................................DRDrive FIT .......................................DFDrop ..............................................DDrop Manhole ...............................DMHDry Bulb ........................................DBDry Bulb Temperature ..................DBTDry Pipe Valve ..............................DPVDuctile Iron....................................DIDuplex...........................................DXDuplicate.......................................DUPDynamic........................................DYNDynamic Snubber .........................DYN SDynamotor ....................................DYNMDynamo ........................................DYNDynamometer ...............................DYNMT

- E -Each..............................................EAEast...............................................EEccentric .......................................ECCEccentricity Detector.....................EDEconomizer...................................ECONEductor .........................................EDUCEffective ........................................EFFEffective Horsepower....................EHP

Efficiency ......................................EFFEffluent..........................................EFLEjector...........................................EJCTRElastic Limit...................................ELElbow ............................................ELLElectric ..........................................ELECElectric Motor Operated................EMOElectric Control Room...................ECRElectrical Hydraulic Controls .........EHCElectrohydraulic ............................ELYHDElectrolyte .....................................ELECTElectrolytic ....................................ELECTCElectromechanical ........................ECMCHElectromotive Force......................EMFElectrostatic ..................................ESElement.........................................ELEMElementary....................................ELEMElevate..........................................ELEVElevation .......................................ELElevator.........................................ELEVElongation.....................................ELONGEmergency....................................EMEREmergency Bearing Oil Pump ......EBOPEmergency Feedwater System.....EFSEmergency Gas Treatment

System ......................................EGTSEmergency Oil Pump....................EOPEmergency Power ........................EPEnclose .........................................ENCLEnd Cell Switch.............................EC SWEngine...........................................ENGEngineer .......................................ENGREngineering...................................ENGRGEntainment....................................ENTMEntrance .......................................ENTEnvelope.......................................ENVEnvironmental System..................ESEqual.............................................EQEqualizer .......................................EQLEquation........................................EQEquipment.....................................EQPTEquipment Drain ...........................EDEquipment Drain Tank ..................EDTEquivalent .....................................EQUIVErection.........................................ERECEscape..........................................ESCEssential .......................................ESSN

26 ISA-RP60.6-1984

Essential Control Instrumentation..........................ECI

Estimate........................................ESTEvacuation....................................EVACEvaporator ....................................EVAPExcavate.......................................EXCExcavation ....................................EXCAVExcessive .....................................EXCExchange......................................EXCHExcitation ......................................EXCExciter...........................................EXCExclusive ......................................EXCLExecutive ......................................EXECExhaust.........................................EXHExhaust Hood Thermostat............EHTExisting .........................................EXISTExpand .........................................EXPExpansion.....................................EXPExpansion Valve...........................EXP VExperiment ...................................EXPExplosion Proof ............................EPExploration....................................EXPLExpose..........................................EXPExpulsion ......................................EXPExtension......................................EXTExterior .........................................EXTExternal ........................................EXTExtinguish .....................................EXTExtra High Voltage........................EHVExtraction......................................EXTRExtraction Steam System .............ESSExtreme High Water .....................EHWExtreme Low Water ......................ELWExtrude .........................................EXTR

- F -Facility ..........................................FACILFahrenheit ....................................FFail As Is.......................................FAIFail Close......................................FCFail Open......................................FOFailure...........................................FAILFailsafe .........................................FLSFFarad ............................................FFeature .........................................FEAFederal .........................................FED

Feed..............................................FDFeeder ..........................................FDRFeedwater.....................................FWFeedwater Control System ...........FWCSFeet...............................................FTFeet Per Day.................................FT/D, FPDFeet Per Minute ............................FT/ MIN, FPMFeet Per Second...........................FT/SEC, FPSFeet Per Year ...............................FT/YR, FPYFemale..........................................FEMFence............................................FENFiber..............................................FBRField ..............................................FLDField Multiplex...............................FMFigure............................................FIGFilament ........................................FILFilament Center Tap .....................FCTFillet ..............................................FILFilling ............................................FILLFilter..............................................FLTRFinger............................................FGRFire................................................FFire Control ...................................FCFire Department Connection.........FDCFire Door.......................................F DRFire Extinguisher Cabinet .............FECFire Hose ......................................FHFire Hose Cabinet.........................FHCFire Hose Rack .............................FHRFire Hydrant ..................................FHFire Main.......................................FMFire Protection System .................FPSFireproof .......................................FPRFFireproofing...................................FPRFGFixture...........................................FIXFlameproof....................................FPFlametight .....................................FTFlange...........................................FLGFlashing ........................................FLFlashless.......................................FLHLSFlat................................................FFlat Bar .........................................FBFlexible .........................................FLEXFloat..............................................FLTFloat Switch ..................................FSFlooding ........................................FLDNGFloor..............................................FL

ISA-RP60.6-1984 27

Floor Drain....................................FDFlow Control Valve .......................FCVFlow Diagram ...............................FDFlow Switch ..................................FWSFlowmeter.....................................FMFluid..............................................FLFluorescent...................................FLUORFlush.............................................FL

Flywheel Effect .............................WR2

Focus............................................FOCFoot ..............................................FTFootcandle....................................FCFootlambert ..................................FLFoot-Pound...................................FT-LBFoot-Pound Second......................FPSFor Example .................................EGForce ............................................FForced Draft..................................FDForced Draft Blower......................FDBForced Oil Air................................FOAForenoon ......................................AMForged Steel .................................FSTForging .........................................FORGFork ..............................................FKForward ........................................FWDFoundation....................................FDNFoundry ........................................FDRYFour-wire ......................................4WFractional......................................FRACFractional Horsepower .................FHPFrame ...........................................FRFramework....................................FRWKFraming ........................................FMGFree on Board...............................FOBFreeboard .....................................FREEBDFreezing Point ..............................FPFreight ..........................................FRTFrequency.....................................FREQFrequency Changer......................FREQ CHFrequency Shift ............................FSFrequency Shift Keying ................FSKFrequency, High ...........................HFFrequency, Low............................LFFrequency, Medium......................MFFrequency Modulation ..................FMFrequency, Super High.................SHFFrequency, Ultra High...................UHF

Frequency, Very High ...................VHFFrequency, Very Low....................VLFFresh Water ..................................FWFrom Below...................................FR BELFront .............................................FRFront Connected ...........................FCFront View.....................................FVFuel...............................................FFuel Building .................................FBFuel-Air Ratio................................F/A RATIOFuel Oil .........................................FOFuel Oil System ............................FOSFurnish..........................................FURNFuse..............................................FUFuse Block ....................................FBFusible ..........................................FSBLFusion Point..................................FNPFuture ...........................................FUT

- G -Gage or Gauge.............................GAGallery ..........................................GALLGallon ...........................................GALGallons Per Acre Per Day.............GPADGallons Per Hour ..........................GPHGallons Per Minute .......................GPMGallons Per Second......................GPSGalvanize......................................GALVGalvanize Iron...............................GIGalvanized Steel...........................GSGalvanized Steel Wire Rope.........GSWRGarage..........................................GARGas ...............................................GGas Analyzer ................................GAGas Circuit Breaker ......................GCBGas Pressure Gage ......................GPGGas Stripper..................................GSGas Turbine ..................................GTRBGasoline........................................GASOGate Input Card ............................GICGate Output Register....................GORGate Valve ....................................GTVGeneral .........................................GENGeneral Purpose Register ............GPRGenerator......................................GENGenerator Cooling System ...........GCSGiga ..............................................G

28 ISA-RP60.6-1984

Giga Hertz ....................................GHZGigavar .........................................GVARGigavolt-Ampere...........................GVAGigawatt .......................................GWGirder............................................GGlass ............................................GLGlaze ............................................GLGlobe Valve ..................................GLVGovernor Load Change Motor......GLCMGrade............................................GRGrading.........................................GRGGraduation....................................GRADGrains Per Gallon .........................GPGGram.............................................GGram Calorie ................................G-CALGram-meter ..................................G-MGraphic .........................................GRAPHGraphite........................................GPHGravel ...........................................GVLGravity ..........................................GGrey..............................................GYGrease Trap .................................GTGreen............................................G, GRNGrid...............................................GGrind.............................................GRDGrommet.......................................GROMGroove..........................................GRVGross Weight................................GRWTGround..........................................GRDGroup............................................GRGuard............................................GDGypsum ........................................GYPGyroscope ....................................GYRO

- H -Hand Control ................................HCHand Generator............................HGHand Reset...................................HRHand Switch .................................HSHand Wheel..................................HD WHLHand Hole.....................................HHHandle ..........................................HDLHard..............................................HHead.............................................HDHead Water Gage Well.................HWGWHeader..........................................HDRHeadless.......................................HDLS

Headquarters ................................HQHead Water...................................HWHeat ..............................................HTHeat Exchanger ............................HXHeat Rejection System .................HRSHeater ...........................................HTRHeater Drain & Vent System.........HDVSHeating .........................................HTGHeating Boiler System ..................HBSHeating Cabinet ............................HCHeating Coil ..................................HCHeating, Ventilating, and

Air Conditioning.........................HVACHeavy............................................HVYHeight ...........................................HGTHenry ............................................HHertz .............................................HZHexagon .......................................HEXHigh ..............................................HHigh Frequency ............................HFHigh-High......................................HHHigh-Low.......................................HLHigh Pressure ...............................HPHigh Pressure Fire

Protection System.....................HPFPSHigh Pressure Injection.................HPIHigh Pressure Injection System....HPISHigh Speed...................................HSHigh Temperature.........................HTHigh Temperature Water ..............HTWHigh Tension.................................HTHigh Voltage .................................HVHighway ........................................HWYHoldup Pump................................HUPHoldup Tank .................................HUTHolding..........................................HLDGHolding Coil ..................................HCHollow ...........................................HOLHorizontal......................................HORIZHorsepower ..................................HPHot Water......................................HWHot Water, Circulating...................HWCHot Well ........................................HWHour ..............................................HRHouse ...........................................HSEHousing.........................................HSGHumidistat.....................................HSTAT

ISA-RP60.6-1984 29

Hundred........................................CHundredweight .............................CWTHybrid ...........................................HYBHydraulic.......................................HYDRHydroelectric.................................HYDRELCHydrogen......................................H2

Hydrogen (Ion Concentration) ......pHHydrostatic....................................HYDROHypochlorite..................................HYPCL

- I -Identical ........................................ IDENTIdentify .......................................... IDENTIgnition .......................................... IGNIlluminate ...................................... ILLUMImpact........................................... IMPImpedance.................................... IMPImperial......................................... IMPImpulse ......................................... IMPInboard ......................................... INBDIncandescent ................................ INCANDInch............................................... INInch-pound.................................... IN-LBInch Per Inch ................................ IN/INInches Per Revolution .................. IN/REVInches Per Second ....................... IPSIncinerator..................................... INCINInclude.......................................... INCLIncoming....................................... INCIncrease........................................ INCRIndependent.................................. INDEPIndicate ......................................... INDIndicated Horsepower................... IHPIndicating Lamp ............................ ILIndicator........................................ INDInduced Draft ................................ IDInductance or Induction ................ INDInformation.................................... INFOInjection ........................................ INJInjection Water System................. IWSInlet............................................... INLInput/Output.................................. I/OInside ............................................ INSInspect .......................................... INSPInstall ............................................ INSTLInstantaneous............................... INSTInstantaneous Relay..................... IR

Instruction .....................................INSTRInstruction Book ............................IBInstrument.....................................INSTRInstrumentation .............................INSTMInsulating Oil System....................IOSInsulting Transformer....................ITIntake ............................................INTKIntegral..........................................INTIntegrating.....................................INTIntercept........................................INTCPInterceptor.....................................INTCPRInterchangeable ............................INTCHGIntercommunication ......................INTERCOMIntercooler.....................................INCOLRIntegrated Control System............ICSInterior...........................................INTInterior Communication.................ICInterlock ........................................INTLKIntermediate..................................INTMDIntermediate Distributing Frame ...IDFIntermediate Frequency................IFIntermediate Power Amplifier........IPAIntermediate Pressure ..................IPIntermediate Range Monitoring ....IRMIntermittent....................................INTMTInternal..........................................INTInterphone Control Station............ICSInterrupt ........................................INTERInterruptions Per Minute ...............IPMInterruptions Per Second ..............IPSIntersect ........................................INTInverse ..........................................INVSInverse Time Relay.......................ITRInvert.............................................INVInverter..........................................INVRIon Exchanger...............................IXIrregular ........................................IRREGIsland ............................................IIsolate ...........................................ISOLIsolation ........................................ISLNIssue .............................................ISS

- J -Jack ..............................................JJacket Water.................................JWJacking Pump ...............................JPJoint ..............................................JT

30 ISA-RP60.6-1984

Joule ............................................. JJournal.......................................... JNLJunction ........................................ JCTJunction Box................................. JB

- K -Kelvin............................................KKey ...............................................KKey Box ........................................KBXKeyseat.........................................KSTKeyway.........................................KWYKick Plate......................................KPKick Plate & Drip...........................KP&DKilo................................................KKilocalorie .....................................KCALKilocycle .......................................KCKilocycles Per Second..................KSKilogram .......................................KGKilogram Meter .............................KG-MKilograms Per Cubic Meter...........KG PER CU MKilograms Per Second..................KGPSKilohertz........................................KHZKiloliter..........................................KLKilometer ......................................KMKilometer Per Hour .......................KMPHKilometer Per Second...................KMPSKilovar...........................................KVARKilovarhour ...................................KVARHKilovolt ..........................................KVKilovolt-ampere.............................KVAKilovolt-ampere Hour....................KVAHKilowatt .........................................KWKilowatt-hour.................................KWHKinescope.....................................KINKip (1000 lb) .................................KKip-feet .........................................K-FTKnife Switch..................................KN SWKnocked Down .............................KDKnock-out .....................................KO

- L -Laboratory ....................................LABLadder ..........................................LADLambert ........................................LLaminate.......................................LAMLamp.............................................LLamp, Green Indicating ................GIL

Lamp, Red Indicating....................RILLamp, Yellow Indicating................YILLamp, White Indicating .................WILLanding .........................................LDGLatch Indicator Switch...................LISLateral...........................................LATLatitude.........................................LATLavatory ........................................LAVLeakage ........................................LKGLeakoff ..........................................LOFFLeft................................................LLeft Hand ......................................LHLength...........................................LGLetdown ........................................LTDNLevel .............................................LVLLevel Controller.............................LCLevel Switch..................................LSLight ..............................................LTLighting .........................................LTGLighting Cabinet............................LCLightning Arrester .........................LALimestone .....................................LMSTLimit ..............................................LIMLimit Switch...................................LIM SWLimited ..........................................LTDLimiter ...........................................LIMLine...............................................LLinear............................................LINLinear Foot....................................LIN FTLink ...............................................LKLiquid ............................................LIQLiquid Petroleum...........................LPLiter...............................................LLive Load ......................................LLLoad Bearing Switch.....................LBSLoad Dispatch System..................LDSLoad Limit Motor ...........................LLMLoad Limiting Resistor ..................LLRLoad Ratio ....................................LRLoad Ratio Control........................LRCLoad Shifting Resistor...................LSRLocked Closed ..............................LCLocked Open ................................LOLogarithmic ...................................LOGLong..............................................LLongitude ......................................LONGLow ...............................................L

ISA-RP60.6-1984 31

Low Frequency .............................LFLow-Low .......................................LLLow Pass......................................LPLow Point......................................LPLow Pressure................................LPLow Pressure Injection .................LPILow Pressure Injection System ....LPISLow Speed....................................LPSLow Temperature .........................LTLow Tension .................................LTLow Torque...................................LTLow Vacuum Alarm ......................LVALow Voltage..................................LVLower............................................LWRLubricating Oil...............................LOLumen...........................................LMLumens Per Watt..........................LPW

- M -Machine........................................MACHMagnet..........................................MAGMagnetic .......................................MAGMagneto........................................MAGMain..............................................MNMain Control Room.......................MCRMain Distributing Frame ...............MDFMain Feedwater Pump .................MFPMain Feedwater Pump Turbine ....MFPTMain Steam Isolation Signal .........MSISMain Steam Systems....................MSSMain Steam Vault .........................MSVMaintenance.................................MAINTMakeup.........................................MKUPManhole........................................MHManifold ........................................MANFManual..........................................MNLManual Volume Control ................MVCManufacture..................................MFRManufactured................................MFDManufacturer ................................MFRRManufacturing...............................MFGMarine...........................................MARMaster...........................................MAMaster Oscillator...........................MOMaster Trip Solenoid ....................MTSMasterswitch.................................MSWMaterial.........................................MATL

Maximum ......................................MAXMaximum Differential Pressure.....MAX DIFF PMaximum Differential

Temperature .............................MAX DIFF TMaximum Working Pressure.........MWPMean Effective Difference.............MEDMean Effective Pressure...............MEPMean Sea Level............................MSLMechanical....................................MECHMechanism ...................................MECHMedical .........................................MEDMedium.........................................MEDMega.............................................MMegacycles...................................MCMegahertz.....................................MHZMegavolt Ampere..........................MVAMegawatt ......................................MWMegawatt Demand Setter .............MDSMegawatt Hour .............................MWHMegohm........................................MΩMetal .............................................METMeteorological ..............................METMeter (instrument) ........................MTRMeter (Instr, Comb

Form & Unit of Length)..............MMetering........................................MTRMeters Per Second .......................MPSMicro ................................................. µMicroampere.................................... µAMicrofarad ........................................ µFMicrohenry ....................................... µHMicrometer ....................................... µMMicromho.......................................... µMHOMicro-Micro (use Pico)Micromicrofarad (use Picofarad)Micron (use Micrometer)Microseconds .................................. µSECMicrovolt ........................................... µVMicrovolts Per Meter ...................... µV/MMicrowatt .......................................... µWMicrowave.....................................MWMiles .............................................MIMiles Per Gallon ...........................MPGMiles Per Hour ..............................MPHMilli................................................MMilliampere ...................................MAMilligram .......................................MG

32 ISA-RP60.6-1984

Millihenry ......................................MHMillilambert ...................................MLMilliliter..........................................MLMillimeter ......................................MMMillion Gallons Per Day ................MGDMilliseconds ..................................MSMillivolt..........................................MVMilliwatt.........................................MWMinimum.......................................MINMinimum Differential Pressure .....MIN DIFF

PRESSMinimum Differential

Temperature..............................MIN DIFF TEMPMinute...........................................MINMiscellaneous...............................MISCMixture..........................................MIXModulator......................................MODModulator and Demodulator .........MODEMMoisture........................................MSTREMolding .........................................MLDGMolecular Weight..........................MOL WTMonitor..........................................MONMonth............................................MOMotor ............................................MOTMotor Control Center ....................MCCMotor Field....................................MFMotor Generator ...........................MGMotor Operated ............................MOMotor Operated Disconnect..........MODMotor Operated Valve ..................MOVMounted........................................MTDMounting.......................................MTGMultiple .........................................MULTMultiplexer ....................................MPX

- N -Nameplate ....................................NPNano Second................................NSECNegative .......................................NEGNet Positive Section Head............NPSHNetwork ........................................NETNeutral ..........................................NEUTNitrogen........................................N2

Nominal ........................................NOMNormal ..........................................NORNormal Pool Elevation ..................NOR POOL ELNormal Power...............................NORP

Normally Closed ...........................NCNormally Open..............................NONorth .............................................NNortheast ......................................NENorthwest......................................NWNozzle...........................................NOZNuclear .........................................NUCNumber .........................................NO

- O -Off-Gas .........................................OGOff-Gas System ............................OGSOhm .................................................. ΩOil Circuit Breaker.........................OCBOil Insulated..................................OIOil Level Gage ..............................OLGOil Switch......................................OSOpen-Close-Open.........................O-C-OOpening ........................................OPNGOperate.........................................OPROperator........................................OPEROptical...........................................OPTOrientation ....................................ORNTOrifice ...........................................ORFOscillograph..................................OSCOscillograph Test Block ................OSTBOscilloscope .................................OSCOscilloscope Test Block................OSTBOunce ...........................................OZOunce-foot ....................................OZ-FTOunce-inch ...................................OZ-INOutboard.......................................OUTBDOutgoing .......................................OUTOutgoing Repeater .......................OGROutgoing Trunk .............................OGTOutlet ............................................OUTOutput ...........................................OUTOutside .........................................OUTOutside Diameter..........................ODOverall ..........................................OAOvercurrent...................................OCOverflow........................................OVFLOverhead ......................................OVHDOverload .......................................OVLDOverspeed ....................................OVSPOvervoltage ..................................OVVOxidized........................................OXD

ISA-RP60.6-1984 33

Oxygen .........................................O, OXY

- P -Packing.........................................PKGPage .............................................PPages ...........................................PPPair ...............................................PRPanel ............................................PNLParallel..........................................PARPart ...............................................PTPart 1 of 2 .....................................P1/O2Parts Per Billion ............................PPBParts Per Million ...........................PPMPartial ...........................................PARTParticulate.....................................PARTPartition ........................................PTNParty .............................................PTYPassage........................................PASSPassageway .................................PASSWYPatent ...........................................PATPattern ..........................................PATTPeck..............................................PKPenetration ...................................PENPercent .........................................PCTPercission .....................................PERCPerforate.......................................PERFPermanent ....................................PERMPermissive ....................................PERMPerpendicular ...............................PERPPersonnel .....................................PERSPhase ...........................................PHPhotograph...................................PHOTOPhysical ........................................PHYSPick Up .........................................PUPico...............................................PPico Coulomb ...............................PCPico Farad ....................................PFPicture ..........................................PIXPiece.............................................PCPiezometer ...................................PIEZPile................................................PLPilot...............................................PLTPilot Relay ....................................PRPiston-Operated Check Valve ......POCVPlant .............................................PLTPlant Alarm and Display

System ......................................PADS

Plant Computer.............................PCPlant Data Acquisition System......PDASPlant Monitoring System...............PMSPlant Protection System ...............PPSPlastic ...........................................PLSTCPlatform ........................................PLATFPlotting..........................................PLOTPneumatic.....................................PNEUPneumatic Operated.....................POPoint..............................................PTPolarized.......................................POLPole...............................................PPortable ........................................PORTPosition .........................................POSNPositive .........................................POSPotable Water ...............................POT WPotential........................................POTPotential Difference ......................PDPotential Transformer ...................PTPotentiometer ...............................POTPound ...........................................LBPound-foot ....................................LB-FTPound-inch....................................LB-IN

Pounds Per Cubic Foot.................LB/FT3,PCFPounds Per Hour ..........................LB/HR, PPH

Pounds Per Square Foot ..............LB/FT2,PSFPounds Per Square Foot

Absolute....................................PSFAPounds Per Square Foot Gage ....PSFGPounds Per Square Inch...............PSIPounds Per Square Inch

Absolute....................................PSIAPounds Per Square Inch Gage.....PSIGPower............................................PWRPower Amplifier.............................PAPower Cabinet ..............................PCPower Circuit Breaker...................PCBPower Directional Relay ...............PDRPower Factor ................................PFPower Factor Meter ......................PFMPower Line Carrier........................PLCPower Supply................................PWR SPLYPreamplifier...................................PREAMPPrecipitator....................................PPTRPreferred.......................................PFDPremolded ....................................PRMLDPrepare .........................................PREP

34 ISA-RP60.6-1984

Press ............................................PRSPressure .......................................PRESSPressure Reducing Valve .............PRVPressure Switch............................PSPressurizer ...................................PZRPressurizer Relief Tank ................PRTPrimary .........................................PRIPrimary Makeup Water System....PMWSPriming .........................................PRMGPrinter ...........................................PTRPrivate Automatic Exchange ........PAXPrivate Branch Exchange.............PBXProcess.........................................PRCSProduct Detector...........................PDProject ..........................................PROJProof .............................................PRFProportional ..................................PROPNLProtection .....................................PROTPublic-Address System ................PAPull Box ........................................PBPull Button Switch.........................PULL B SPulsating Current..........................PCPulse Code Modulation ................PCMPulse Duration Modulation ...........PDMPulse Time Modulation .................PTMPulses Per Second.......................PPSPulverizer......................................PULVPump ............................................PMPPunch ...........................................PCHPurification....................................PRFCNPurging .........................................PRNGPurple ...........................................PRP, PRPush Button ..................................PBPush Button Station......................PB STAPush-Pull ......................................P-PPyrometer .....................................PYR

- Q -Quadrant.......................................QUADQuantity ........................................QTYQuart.............................................QTQuarter .........................................QTRQuartz...........................................QTZ

- R -Radial ...........................................RDLRadian ..........................................RAD

Radiation.......................................RADNRadio Frequency ..........................RFRadius...........................................RRange ...........................................RNGRankline........................................RRatio .............................................RRatio Detector...............................RDRaw Cooling Water.......................RCWRaw Service Water .......................RSWRaw Water ....................................RWRaw Water Chlorination System...RWCLSReactive........................................REACReactive Factor Meter ..................RFMReactive Kilovolt Ampere..............KVARReactive Volt Ampere ...................VARReactive Voltmeter .......................RVMReactor .........................................REACReactor Building ...........................RBReal Time Clock ...........................RTCReceive.........................................RCVReceived.......................................RCVDReceiver........................................RCVRReceiving ......................................RCVGReceptacle....................................RCPTReception......................................RCPNReciprocal.....................................RECIPReciprocate...................................RECIPRecirculate....................................RECIRCRecirculation .................................RECIRCNReclosing ......................................RECLRecognition...................................RECOGRecord ..........................................RCDRecorder .......................................RCDRRecording .....................................RCDGRectifier.........................................RECTRed ...............................................RReduce .........................................REDReduction......................................REDUCRefinery ........................................REFRefractory .....................................REFRRefrigerant ....................................REFRIGRefrigerate ....................................REFRRegenerative ................................REGENRegister ........................................REGRegular .........................................REGRegulate .......................................REGReheat ..........................................RH

ISA-RP60.6-1984 35

Reheat Stop Valve........................RSVReheater.......................................RHRRelative Humidity..........................RHRelay ............................................RLYRelease ........................................RLSERelief ............................................RLFRelief Valve ..................................RVRemote Control ............................RCRequired .......................................REQDReserve ........................................RSVReservoir ......................................RSVRResidual........................................RESIDResidual Heat Removal................RHRResidual Heat Removal Pump .....RHRPResidual Heat Removal System...RHRSResistance....................................RESResistance Temperature Device ..RTDRetainer ........................................RETRetard...........................................RETRetractable ...................................RETRReturn...........................................RTNReverse ........................................REVRevolution.....................................REVRevolutions Per Minute ................RPMRevolutions Per Second...............RPSRheostat .......................................RHEORight .............................................RRod Block Monitoring ...................RBMRoller Bearing...............................RBRoof ..............................................RFRoom............................................RMRoot Diameter ..............................RDRoot Mean Square .......................RMSRotary ...........................................ROTRotate ...........................................ROTRoughness Height Rating.............RHRRound...........................................RDRubber..........................................RUBRupture.........................................RUPT

- S -Safety ...........................................SAFSafety Valve .................................SVSalinometer ..................................SALSalt Water.....................................SWSalvage.........................................SALVSample .........................................SMPL

Sampling.......................................SMPLGSampling System..........................SSSanitary.........................................SANSaturate ........................................SATSaybolt Seconds Furol

(Oil Viscosity) ............................SSFSaybolt Seconds Universal

(Oil Viscosity) ............................SSUScale.............................................SCSchematic .....................................SCHEMScrubber .......................................SCRBSeal Oil Backup ............................SOBUSealed...........................................SLDSea Level......................................SLSecond..........................................SECSecond-Feet

(Cubic Feet Per Second) ..........CFSSecondary.....................................SECSection..........................................SECTSegment .......................................SEGSelect............................................SELSelector.........................................SELSemi-Automatic ............................SEMI AUTOSender ..........................................SDRSeparator ......................................SEPSequence......................................SEQSequential.....................................SEQLSerial.............................................SERSerial Channel Input/Output .........SCIOSerial Model Interface...................SMISeries............................................SERService..........................................SERVService Air System .......................SASService Building ............................SBSet Point .......................................SPSettling..........................................SETSewer............................................SEWShaft .............................................SFTShaft Horsepower .........................SHPShield............................................SHLDShort Circuit ..................................SHR CKTShort Circuit Ratio.........................SCRShort Wave...................................SWShunt ............................................SHShut-Off Valve ..............................SOVShutdown......................................SD,SHTDNSide...............................................S

36 ISA-RP60.6-1984

Signal............................................SIGSilence..........................................SILSimplex.........................................SXSingle............................................SSingle Feeder ...............................SFSingle Frequency..........................SFSingle Pole, Double Throw ...........SPDTSingle Pole, Single Throw ............SPSTSingle Sideband ...........................SSBSink...............................................SKSkimmer .......................................SKIMSleeve...........................................SLVSleeve Bearing .............................SBSlide..............................................SLSmall.............................................SMSmoke ..........................................SMKSocket...........................................SOCSolenoid........................................SOLSolenoid Operated Valve..............SOVSolid State ....................................SSSoot Blower ..................................SBSound ...........................................SNDSouth ............................................SSoutheast .....................................SESouthwest.....................................SWSpace ...........................................SPSpacer ..........................................SPCRSpare ............................................SPSpeaker ........................................SPKRSpecial..........................................SPLSpecific .........................................SPSpecific Gravity.............................SP GRSpecific Heat ................................SP HTSpeech-Plus-Tone........................S+TSpeed ...........................................SPSpeed No Load.............................SNLSpherical.......................................SPHERSpherical Candle Power ...............SCPSpindle..........................................SPDLSplit Phase ...................................SP PHSquare ..........................................SQSquare Root .................................SQRTSquirrel Cage................................SQ CGStairway........................................STWYStandard .......................................STDStandby ........................................STBYStandby Diesel Generator

System.......................................SDGSStandpipe......................................SPStarting .........................................STGStartup ..........................................SU, STUPStatic Pressure .............................SPStation...........................................STAStation Drainage System..............SDSStation Service..............................SSStationary......................................STAStator ............................................STATSteam ...........................................STSteam Generator ..........................SG, STGENSteam Jet Air Ejector ....................SJAESteering ........................................STEERStock.............................................STKStorage .........................................STORStorm Water..................................ST WStrainer .........................................STRStream ..........................................STRStrip ..............................................STRStructural ......................................STRStructure .......................................STRStuffing Box ..................................SBSubmerged ...................................SUBSubstation.....................................SUBSTASuction..........................................SUCTSummary ......................................SUMSummer ........................................SUMRSupervise or Supervisor ...............SUPVSupervisory Control

and Data Acquisition .................SCADASupplement...................................SUPPSupply...........................................SUPSupport .........................................SUPSuppression..................................SUPPRSuspend........................................SUSPSuspended....................................SUSPSwing ............................................SWGSwitch ...........................................SWSwitch and Relay Types

Single Pole Switch ....................SP SWSingle Pole, Single

Throw Switch .........................SPST SWSingle Pole, Double

Throw Switch .........................SPDT SWDouble Pole Switch...................DP SWDouble Pole, Single

ISA-RP60.6-1984 37

Throw Switch.........................DPST SWDouble Pole, Double

Throw Switch..........................DPDT SWTriple Pole Switch......................3P SWTriple Pole, Single

Throw Switch..........................3PST SWTriple Pole, Double

Throw Switch..........................3PDT SW4 Pole Switch.............................4P SW4 Pole Single Throw Switch.......4PST SW4 Pole Double Throw Switch .....4PDT SW

Switchboard..................................SWBDSwitcher........................................SWRSwitchgear....................................SWGRSwitchyard ....................................SWYDSynchroscope...............................SYNSCPSystem..........................................SYS

- T -Tabulate........................................TABTachometer ..................................TACHTandem ........................................TDMTangent ........................................TANTangent Spiral ..............................TSTank..............................................TKTaper ............................................TPRTaper Per Foot .............................TPFTaper Per Inch..............................TPITaper Shank.................................TSTarpaulin.......................................TARPTechnical ......................................TECHTee ...............................................TTeeth ............................................TTeeth Per Inch ..............................TPITelegraph .....................................TLGTelemeter .....................................TLMTelephone.....................................TELTelephone Jack ............................TJTelephone Line Carrier.................TLCTeletypewriter Exchange..............TWXTelevision .....................................TVTemperature .................................TEMPTemperature Absolute ..................TTemperature Indicator ..................TEMP INDTemperature Indicator Control......TICTemperature Meter.......................TMTemperature Modifier ...................TM

Temperature Monitoring System ..TMSTemporary ....................................TEMPTennessee ....................................TNTensile Strength............................TSTension .........................................TENSTentative .......................................TENTTerminal........................................TERMTerminal Board or Block ...............TBTerritory ........................................TERRTertiary..........................................TERTest Block .....................................TBTest Link .......................................TLTexas ............................................TXThermal.........................................THRMThermal Element ..........................TEThermal Switch .............................TSThermocouple...............................TCThermometer ................................THERMThermostat....................................THERMOThick .............................................THKThousand......................................MThousand Circular Mills ................KCMILThousand Cubic Feet ...................MCFThousand Foot Pound ..................KIP-FTThousand Pound ..........................KIPThrottle..........................................THROTThrough ........................................THRUThrust............................................THRThursday.......................................THUTicket ............................................TKTTie Line .........................................TLTimber...........................................TMBRTime..............................................TTime Delay....................................TDTime Delay Closing.......................TDCTime Delay Opening .....................TDOToggle...........................................TGLTolerance......................................TOLToll ................................................TTon Mile ........................................TON-MITons of Refrigeration ....................TRTons Per Hour ..............................TPHTons Per Square Foot ..................TSFTorque ..........................................TORTotal..............................................TOTTotal Dynamic Head .....................TDHTotal Head, Feet ...........................TH

38 ISA-RP60.6-1984

Total Indicator Reading ................TIRTotal Pressure ..............................TPTower............................................TWRTownship ......................................TWPTrain .............................................TNTraining.........................................TNGTransceiver...................................XCVRTransducer ...................................XDCRTransfer ........................................TRANSTransfer Switch.............................XSTransfer Trip .................................TTTransfer Trip Relay.......................TTRTransformer ..................................XFMRTranslator .....................................XLTRTransmission ................................XMSNTransmit-Receive .........................TRTransmitter ...................................XMTRTransmitting..................................XMTGTransportation ..............................TRANSTransverse....................................TRANSVTread ............................................TRDTreatment .....................................TRTMTTrimmer ........................................TRIMTriode ...........................................TRITrip Coil ........................................TCTrip Cut Out ..................................TCOTrunk ............................................TRKTruss.............................................TTubing...........................................TUBTuesday........................................TUETuned Radio Frequency ...............TRFTunnel...........................................TNLTurbine .........................................TURBTurbine Building............................TBTurbine Drive ................................TDTurbine Extraction Taps

and Drain System......................TETDSTurbine Generator ........................TURBOGEN, T-

GTurbogenerator Control System ...TGCSTurnout .........................................TOTurns Per Inch ..............................TPITurret ............................................TURTwisted .........................................TWTwo Frequency.............................2F2-way Trunk..................................2WTTwo Wires.....................................2W

- U -Ultimate.........................................ULTUltra High Frequency....................UHFUnder Voltage...............................UVUnder Voltage Device...................UVDUnderground.................................UNDGUnderwater ...................................UNDWUnit ...............................................UUnit Cooler....................................UCUnit Heater....................................UHUnit Operator ................................UOUniversal.......................................UNIVUpper ............................................UPRUpscale.........................................UPSUpstream ......................................UPSTRUtah ..............................................UT

- V -Vacuum.........................................VACVacuum Priming System ..............VPSVacuum Tube ...............................VTValve.............................................VValve Box......................................VBValve Position Detector ................VPDVariable.........................................VARVariable Frequency Oscillator.......VFOVariable Spring Support................VSVaries............................................VRSVegetable......................................VEGVelocity .........................................VELVelocity Pressure..........................VPVent Pipe ......................................VPVent Stack ....................................VSVentilate........................................VENTVentilating System........................VSVentilation .....................................VENTVenturi ..........................................VTIVermont ........................................VTVersus...........................................VSVertical..........................................VERTVery-High Frequency....................VHFVery-Low Frequency.....................VLFVibrate ..........................................VIBVibration........................................VIBVibration Transmitter ....................VTVideo.............................................VID

ISA-RP60.6-1984 39

Video-Frequency ..........................VDFViolet.............................................VIO, VVirginia..........................................VAViscosity .......................................VISCVitreous ........................................VITVoice Frequency...........................VGVolt ...............................................VVoltage to Current ........................E/IVoltage to Pneumatic ...................E/PVoltage Relay ...............................VRVoltampere ...................................VAVoltmeter ......................................VMVolts Per Mil .................................V/MILVolume .........................................VOLVolume Control Tank....................VCT

- W -Wall...............................................WWarehouse ...................................WHSEWasher .........................................WASHWashington...................................WAWaste Disposal System................WDSWaste Water & Oil ........................WWOWater ............................................WTRWater Gage ..................................WGWater Heater ................................WHWater Line ....................................WLWater, Oil or Gas..........................WOGWater Surface Elevation...............W S ELWater Tank ...................................WTWater Treatment System..............WTSWaterproof....................................WPFWatertight .....................................WTWaterworks...................................WWWatt ..............................................WWatthour .......................................WHWatthour Meter.............................WHMWattmeter .....................................WMWatts Per Candle .........................WPCWeatherproof................................WPWednesday...................................WEDWeek ............................................WKWeight ..........................................WTWeld Neck ....................................WNWest .............................................WWest Virginia ................................WVWet Bulb .......................................WB

Wet Bulb Temperature..................WBTWetted Surface .............................WSWhite.............................................WHT, WWide..............................................WWidth.............................................WWind..............................................WDWinding.........................................WDGWindow.........................................WDWWiring............................................WIRWisconsin .....................................WIWith...............................................W/Without..........................................W/OWorking Pressure .........................WPRWorking Steam Pressure..............WSPWyoming.......................................WY

- Y -Yard ..............................................YDYear ..............................................YRYellow ...........................................YEL, Y

- Z -Zero Speed Switch .......................ZSSZone Switch ..................................ZSUtah ..............................................UT

40 ISA-RP60.6-1984

Appendix C Character heights

Intended Viewing Distance Minimum Height Nominal Height1-2/3 ft. or less 0.09 in. 0.16 in.1-2/3 ft. to 3 ft. 0.17 in. 0.28 in.3 ft. to 6 ft. 0.34 in. 0.56 in.6 ft. to 12 ft. 0.68 in. 1.12 in.12 ft. to 20 ft. 1.13 in. 1.87 in.

ISA-RP60.6-1984 41

Appendix D Gothic lettering examples

1/8’’ LETTER HEIGHT .015 LETTER STROKEABCDEFGHIJKLMNOPQRSTUVW

XYZ—0123456789%?” #$( )&

3/16’’ LETTER HEIGHT .020 LETTER STROKEABCDEFGHIJKLMNOPQRSTUVW

XYZ—0123456789%?” #$( )&

1/4’’ LETTER HEIGHT .025 LETTER STROKEABCDEFGHIJKLMNOPQRSTUVW

XYZ—0123456789%?” #$( )&

42 ISA-RP60.6-1984

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