above ground coating may 2007.pdf

7/27/2019 Above Ground Coating May 2007.pdf

1/21

Above Ground Coating

This Required Practice is designed to provide consistency in the application of paintsand coating on above grade piping, vessels, and structural steel.

DCP Midstream

May 2007


2/21

Revision Log

05/30/07 iABOVE GROUND COATING MAY 2007

Copy valid at time of printing from DCP Midstream Portal. Refer to Portal for current version.

REVISION LOG

Record o f Revisions to This Document

Rev.

No.

Date of

Revision

Descript ion of Change SectionChange

Author ized by


3/21

Document Convention

05/30/07 iiABOVE GROUND COATING MAY 2007


DOCUMENT CONVENTION

Text in this document is formatted with special type fonts to denote specialconditions, requirements, or critical pieces of information for the reader.

Arial Font is the default font for text in this document.

Ar ial Bold Ital ic Font denotes optional equipment, processes, or procedures thatmay be included to meet the requirements of a specific location.

Times New Roman Bold Italic Font denotes required equipment, processes, orprocedures to meet sour gas conditions.

COMMENT PROCEDUREAND DOCUMENT OWNER

Questions, comments, and suggestions for changes related to this document shouldbe addressed to the owner of this document.

Owner Mr. Tony Canfield

Contact DCP Midstream370 17th Street, Suite 2500Denver, CO, 80202

Phone 303 605 1864

Email [email protected]

APPEALS PROCEDURE

This Required Practice has been approved by the Operations Engineering Council.

Employees will follow this Required Practice unless a deviation request for non-conformance is submitted and approved. The deviation request must be reviewedand approved by the Division Engineering Manager, Division Operations VP, and theDCP Midstream VP Engineering.

The deviation request must include the following information:

Name of the Engineering Standard, Safe Work Practice, or RecommendedPractice for which the deviation is requested

Specific element(s) of the above Engineering Standard, Safe WorkPractice, or Recommended Practice for which the deviation is requested

Deviation description Justification for deviation request

Mitigation plan (if required)

A template for the Deviation Request may be obtained from the DCP MidstreamPortal.


4/21

Table of Contents

05/30/07 iiiABOVE GROUND COATING MAY 2007


TABLE OF CONTENTS

1. Application of Required Practice ........................................................11.1. Scope........................................................................................................ 1

2. General ..............................................................................................23. Environmental, Health, Safety............................................................3

3.1. Environmental ........................................................................................... 33.2. Health........................................................................................................43.3. Safety........................................................................................................ 4

4. Coating Contractor Scope of Work.....................................................54.1. General .....................................................................................................54.2. Coating Conditions.................................................................................... 74.3. Coating Locations ..................................................................................... 74.4. Clean-up ................................................................................................... 7

5. Coating Specifications........................................................................85.1. Surface Preparation .................................................................................. 8

5.1.1 New steel surfaces (uncoated).................................................................. 85.1.2 Previously coated surfaces ....................................................................... 8

5.2. Coating Schedule...................................................................................... 95.2.1 General Normal Service Uninsulated (Temp Less than 200 F)......... 105.2.2 General Severe Service Uninsulated (Temp Less than 200F) .......... 105.2.3 General Insulated Greater than -50F and Less than 250F................... 115.2.4 General Insulated Greater than 250F and Less than 750F.................. 115.2.5 General Insulated - Less than -50F and Greater than 750F.................... 115.2.6 Insulated Cyclic 100 F to 650 F............................................................ 125.2.7 General Uninsulated, High Temp Surfaces............................................. 125.2.8 Atmospheric Tanks, Drums External Surfaces.....................................125.2.9 Atmospheric Tanks External Surfaces - Tank Bottom.......................... 125.2.10Atmospheric Tanks Internal Surfaces - To Mitigate Internal Corrosion 135.2.11Stainless Steel ........................................................................................ 13

Index.......................................................................................................14Surface Cleaning Codes ....................................................................................... 14Coating Selection Matrix ....................................................................................... 16


5/21

Table of Contents

05/30/07 ivABOVE GROUND COATING MAY 2007



6/21

Application of Required Practice

05/30/07 1ABOVE GROUND COATING MAY 2007


1. APPLICATION OF REQUIRED PRACTICE

This Required Practice is designed to provide consistency in the use of above gradepainting and coating systems.

1.1. Scope

This Required Practice is intended for use external coating for all above-gradesurfaces (gas plants, tank batteries, valve sites, meter runs, structural steel,accessory equipment, etc.) within DCP Midstream plants, booster stations, and forpipeline above ground appurtenances.

This Required Practice is written assuming a Coating Contractor is utilized to providethe coating service.

These specifications shall apply to both shop applied (off-site) and field applied (on-site) coatings.

Due to the ever changing and vast array of industrial coating products available, thisRequired Practice is generic with regard to the coating products used. Given this, theProject Engineer, Construction Coordinator and/or Coating Contractor will need torefer to the manufacturers literature for details such as mixing methods, pot life, timebetween coats, etc. If there is a significant discrepancy between the genericinstructions provided in this document and the manufactures recommendations, themanufacturers recommendation will take precedence.

These specifications cover the coating of all external, above ground surfaces. Forspecial-condition applications not covered in these specifications, it is recommended

the DCP Midstream Project Manager, Asset Engineer or Denver EngineeringServices be consulted for recommendations covering such conditions.


7/21

General



2. GENERAL

The Coating Contractor shall hold a valid State Contractors license for the State inwhich the work is being performed. The license shall cover all phases of the workbeing performed (surface preparation, coating, painting, etc.). The Coating Contractor

shall be responsible for any subcontractor license requirements.

The Coating Contractor shall be pre-approved by the DCP Midstream authorizedrepresentative. At THE DCP MIDSTREAMS request, he shall furnish a list ofreferences and a history of his use or knowledge of the products being used.

The Coating Contractor is responsible for all-necessary personnel and environmentalprotection. The contractor shall obtain all abrasive blasting, painting, or other permitsnecessitated by the work he is to perform.

DCP Midstream reserves the right to provide the coating material or the Contractorshall obtain the coating material from a distributor that is an approved DCPMidstream vendor.

DCP Midstream may provide a third party inspector or a DCP Midstream inspector forall or part of the project. If designated in writing, the inspector shall act as DCPMidstream authorized representative.


8/21

Environmental, Health, Safety



3. ENVIRONMENTAL,HEALTH,SAFETY

3.1. Environmental

Following these storage practices will reduce the exposure of coatings and supplies

to stormwater run-on and runoff at DCP Midstream facilities:

Where feasible, store coating materials in an area with a canopy or roofdesigned to direct runoff away from the storage area.

Regularly check for leaking or ruptured containers.

Careful transport of coating material to and from the work site helps to preventaccidental spills:

Contractor and DCP Midstream personnel shall follow all applicable DOTregulations including proper placarding.

Load and unload coating material on level ground when using a forklift tominimize the chance of tip-overs and potential spills.

Ensure that all coating pallets are securely fastened before moving.

Secure the coating containers to the transport vehicle using approvedmethods such as ropes and straps.

Transport coating and materials to and from work sites in containers withpositive locking lids.

Do not transfer or load coating over or near drain inlets, storm waterdrainage systems, or watercourses.

Proper application practices inhibit coating chips and excess coating drift from beingtransported to storm drainage systems or watercourses by wind or other means:

Monitor weather and wind direction to ensure that coating drift is minimizedand does not enter drain inlets, storm water drainage systems, orwatercourses.

For field applied (on-site) coatings, the contractor shall supply and utilize acontainment system, which allows for the efficient containment of thewashwater, waste, dust, and coating over spray. The containment systemshall have a minimal retention capacity of 100% and shall assure the non-pollution of the surrounding environment.

To avoid spills, follow proper operational procedures for lane striping andcoating applications.

Ensure that the coating spray gun remains closed when not in use toprevent leaks.

Thorough cleanup and disposal practices ensure that coating-related hazardousmaterials and wastes are handled properly:


9/21

Environmental, Health, Safety



Do not clean out the paint spray gun over the ground.

Wipe up small coating spills immediately with rags. For larger spills, usedry absorbent material.

Collect all excess material and coating wash solutions in appropriate

containers. Secure all containers and dispose of properly following allapplicable federal, state and local regulations. Contractor to properlydispose of all coating-related hazardous waste by following all applicablefederal, state and local regulations. For any projects not handled by acontractor, DCP Midstream personnel will properly dispose of all coating-related hazardous waste, or other wastes by following DCP MidstreamWaste Management Plan, all applicable federal, state and localregulations, and manufacturers recommendations.

Dispose of used absorbent and rags, and empty coating and solventcontainers properly.

Contractors should contact the DCP Midstream Representative for moreinformation and guidance.

3.2. Health

3.3. Safety

In accordance to the DCP Midstream Corrosion Protection Painting and CoatingEngineering Standard, liquid coatings and paints containing arsenic, barium,cadmium, lead, mercury, silver, chromium or selenium shall not be used as per 40CFR 261.224.

A. Exception 1 Barium sulfate is used as an extender pigment in coatingsand paint. This compound is insoluble in water, and is not a health hazard per

EPA rules.

B. Exception 2 Zinc coatings which contain less than 0.002% lead can beused

The DCP Midstream Respiratory Protection Program shall be followed for theapplicable activities associated with above ground coating including, but not limitedto, abrasive blasting, scraping, wire brushing, and coating.

All materials introduced into DCP Midstream facilities must comply with theappropriate HazCom labeling requirement and MSDS sheets must be provided.

Appropriate safety measures will be taken in accordance to OSHA guidelines, theDCP Midstream Safe Work Practices and Contractor Safety Handbook to ensure alltasks associated with above ground coating are performed in a safe manner. This willinclude, but is not limited to, proper personal protective equipment, permitting, hot


10/21

Coating Contractor Scope of Work



work, proper scaffolding and fall protection. It should be noted that although thecoating tasks may require Tyvek type material to be worn to protect from coat spray,fire retardant clothing under the Tyvek will still be required to comply with DCPMidstream PPE requirements.

4. COATING CONTRACTOR SCOPE OF WORK

4.1. General

The Coating Contractor shall furnish all labor, materials, equipment, supplies, andaccessories required in connection with the work specified herein, except whereotherwise specified. If specified, DCP Midstream will furnish the coating material only.

For field applied (on-site) coatings, the contractor shall supply and utilize acontainment system, which allows for the efficient containment of the wash water,waste, dust, and coat over spray. The containment system shall have a minimalretention capacity of 100% and shall assure the protection of the surrounding

environment.

DCP Midstream authorized representative reserves the right to change, increase, ordecrease the work as may be necessary, and in such event shall notify the coatingcontractor in writing. If no unit prices are set forth in contract or subcontract, the basisof payment or credit for such changes shall be negotiated and agreed upon beforeproceeding.

The coating contractor shall make no changes and do no extra work without writtenauthorization from DCP Midstream representative prior to commencement of thework.

Contractor shall be responsible for obtaining manufacturers product data sheets fromcoating supplier for all coatings used on DCP Midstream projects. As outlined in theDCP Midstream Safety Manual, the Contractor must supply DCP Midstream a MSDSsheet for each product used.

If DCP Midstream purchases the coating, only the amount necessary to complete theproject should be purchased. If there is excess coating at the end of the project theunused material should be returned to the vendor or used immediately for anotherproject.

If there is a significant discrepancy between the generic instructions provided in thisdocument and the manufactures recommendations, the manufacturersrecommendation will take precedence.

The Coating Contractor is responsible for protecting all in the affected andsurrounding area not to be coated from damage by blasting (abrasives or water) andby coating (direct or over spray).

The Coating Contractor shall mask tape all name plates (on vessels, equipment,valves. PSVs, instrumentation, etc), sight glasses, data points, inspection portscovered with plexiglass or glass, machined surfaces (Flange faces, valve stems,


11/21




etc.), and shall cover all pumps, motors, wiring, conduit, and equipment if necessaryto protect from damage.

The Coating Contractor is to provide the necessary rigging for a complete coatinginspection by DCP Midstreams inspector. The exact need is to be determined at thelocation and time of coating. Usually, the rigging used for coating is sufficient forinspection.

All materials shall be brought to the jobsite in the original sealed and labeledcontainers with appropriate MSDS sheets, and shall be subject to inspection by aDCP Midstream representative.

The Coating Contractor shall store all materials to protect them from the weather,heat, and cold/freezing in accordance with the material data sheets and incompliance with all local regulations and manufacturers recommendations.

The Contractor is responsible for the collection and proper disposal of allpaint/coating generated wastes including wash water, dust, paint/coating chips,

abrasive blast media, etc, in accordance with all applicable federal, state and localregulations, and manufacturers recommendations.

No methyl ethyl ketone (MEK) shall be used, unless specified by the manufacturerand approved by DCP Midstream.

No coating shall be used that has been contaminated, has expired its shelf or pot life,or has previously been opened.

Items not to be coated are site-specific and will be designated by DCP Midstreamrepresentative or inspector on location. Some items to be considered are galvanizedconduit, engines, motors, pumps, etc.

Colors shall be as indicated in the construction specifications, on the drawings, or as

selected by DCP Midstream representative.

A PVC cushion (1/4 inch minimum thickness) shall be installed by the contractorbetween all piping and supports (top straps and bottom rest plates, all materials) aftercoating has cured.

All specifications contained in the product data sheets will be adhered to unlesscovered in the preceding specifications.

If primer coat is shop applied or if vessel or equipment is handled, moved, erected,installed, etc., between primer coat and the topcoat, surface is to be inspected forprimer coat damage by the DCP Midstream representative. All damaged areas areto be cleaned SP-2 and spot primed with same primer material. The DCP Midstreamrepresentative and inspector shall be pre-notified of any shop applied coatings sothey can make arrangements for inspection.

The coating thickness listed in this Required Practice shall be held to a plus or minustolerance of one (1) mil. If there is any doubt about the choice of the proper coatingsystem, the CONTRACTOR shall seek clarification from DCP Midstream prior to thesubmission of the Contractor's bid or "start work".


12/21




4.2.

4.3.

4.4. Clean-up

Coating Conditions

No painting/coating shall take place unless the following conditions are met:

Air temperature is at least 40F and rising.

Temperature of surface to be coated is at least 5F above dew point.

Relative humidity is: equal or less than manufactures recommendations

Wind direction and velocity is such that over spray will not fall onobjects not scheduled to be coated or which cannot be protected fromover spray.

Wet surfaces (in service equipment or facilities that is surface is wet due

to sweating, condensation, etc.) shall not be coated until surface water is removed.The use of paint gloves and wiping cloths is recommended for drying and removingsurface water.

Coating Locations

Generally, equipment that is purchased or assembled in a shop environment will becoated in the shop with the complete coating system under controlled conditions. Thecoating system shall then be touched up in the field.

If so specified in the construction specifications, equipment may be primer coated in

the shop, primer touched up in the field, and top coated in the field.

If so specified in the construction specifications, equipment may be shipped to thefield uncoated and completely coated on the construction site.

All touch up and final coating shall be inspected by the DCP Midstreamrepresentative.

The Contractor shall be responsible for all clean up related to the coating project. Allscaffolding and containers shall be removed from the site and disposed of by theContractor. Coating or paint spots and oil or stains shall be removed. All excess andwaste materials, including abrasive blast media, excess paint, rags, etc. shall beremoved from the site by the Contractor and properly disposed of in accordance withall applicable federal, state and local regulations, and manufacturersrecommendations. The job site shall be left clean.


13/21

Coating Specifications



5. COATING SPECIFICATIONS

5.1. Surface Preparation

Surface preparation will be the responsibility of the contractor unless other

wise specified.

5.1.1 New steel surfaces (uncoated)

Remove all grease, oil, dirt, or other contamination by solvent washing,rinsing, and drying prior to further surface preparation (SP-1 grade).

Green Steel (steel which still has mill scale attached and has not beenatmospheric cured).

Commercial Blast: SSPC-SP-6 grade

Nominal Profile Height: 2-3 mils

Cured Steel (steel which has mill scale dislodged and has been atmosphericcured).

Brush Blast: SSPC-SP-7 grade

Nominal Profile Height: 2-mils

Primer coat may be applied over tight, granular rust. Do not apply over heavyrust scale.

Remove all weld spatter and round all sharp edging by grinding. Blast clean allsurfaces using a sharp, angular abrasive for optimum surface profile.

Coat blast cleaned surfaces within eight hours of blast cleaning or before flashrusting occurs.

5.1.2 Previously coated surfaces

Remove all grease, oil dirt, dust, salts or other contamination by solventwashing, rinsing, and drying prior to further surface preparation (SP-1 grade).

All washwater shall be collected and properly disposed in accordance with allapplicable federal, state and local regulations.

Check compatibility of new material to existing coating.

Conduct a field test by coating existing coated surface with the new coatingand inspect for adhesion, lifting, wrinkling, other signs of incompatibility.

Conduct a lab test by utilizing old coating samples and running standard labcompatibility test. It is recommended this type of testing be performed by athird party coating inspector with lab facilities.


14/21




If old coating is found to be totally incompatible, the DCP Midstreamrepresentative will make the necessary changes and recommendations. Thisis a site-specific condition.

For Compatible Coatings:Brush Blast: SSPC-SP-7 grade

For Incompatible Coatings:

Commercial Blast: SSPC-SP-6 grade

Test should be run on old coatings to determine the environmental handling ofremoved material.

For small jobs or areas where blasting is not possible or permitted, handcleaning and power tool cleaning, SSPC-SP-2 and SP-3 should be used.

In lieu of solvent washing, SP-1 (3.2.1), and blasting, SP-7 (3.2.3), a hydropressure wash to an SP-7 grade is recommended. A minimum of 2500 psipressure should be used. By adding a detergent such as T.S.P., oil andgrease will be removed also.

NOTE: Hydro wash is only for previously coated, compatible coating surfaces,not new steel or incompatible coating surfaces.

5.2. Coating Schedule

All carbon steel surfaces, both new steel and previously coated surfaces(coated with other coating systems than epoxy mastic/urethane), shall receiveboth a primer coat and a topcoat on the entire surface unless otherwisespecified.

(1) Surfaces to be thermal insulated shall receive only a primer coat.If piping is to operate hot, maximum operating temperature mustbe established and compared with paint data. If maximum

temperature is over paint data spec., DCP Midstreamrepresentative will make substitute material recommendation.

(2) Surfaces previously coated with an epoxy mastic/urethanesystem shall have touch up on damage and failure areas withepoxy mastic after hand cleaning (SP-2 and SP-3) and topcoated with urethane.


15/21




A complete top coat of urethane after coating repairs is site-specific and will be to the discretion of DCP Midstreamrepresentative.

(3) In coastal, salt air environments, strip coating of all welds andirregular surfaces shall be applied prior to the application of thefirst (primer) coat.

5.2.1 General Normal Service Uninsulated (Temp Less than200 F)

This specification is for pipe, vessels, spools, ladders, cages, platforms,grating, and structural steel that is in normal service and not insulated.

Surface Preparation (refer to Section 5.1)

Bare Metal = SSPC SP-7 or SSPC SP-6 for Green SteelTo Coat Over a Manufacturers Primer, confirm compatibility andfollow section 5.2.1 SSPC SP-6. If incompatible and for smalltouch-up areas use SSPC SP-2 or SSPC SP-3*

Primer Coat = One coat of Epoxy Mastic at 4-6 mils Dry Film Thickness

Final Coat =One coat of Aliphatic Urethane at 2-3mils Dry FilmThickness

Application Method = Spray, Brush or Roller

*If equipment from the manufacturer has been coated with a primer coat, and

that primer coat meets the specifications above for Primer, then only final coatwill need to be applied.

5.2.2 General Severe Service Uninsulated (Temp Less than200F)

This specification is for pipe, vessels, spools, ladders, cages, platforms,grating, and structural steel that is in severe service and not insulated.

Severe service is defined as offshore/near shore environments (within 100miles of the shore), highly acidic areas, and locations where high humidity mayresult in accelerated external corrosion. High humidity areas shall include

areas within 50 feet of cooling towersInsulated pipe in severe service locations shall use the appropriate coatingschedule as outlined for General Service Insulated.

Surface Preparation

Bare Metal = SSPC SP-10


16/21




To Coat Over a Manufacturers Primer confirm compatibilityand follow section 5.1.2. If compatible and for small touch-upareas, use SSPC SP-2 or SSPC SP-3*. If incompatible, useSSPC SP-6

Primer Coat = Inorganic Zinc at 2.5-4 mils Dry film Thickness

Intermediate Coat = One coat of Epoxy Mastic at 4-6 mils Dry FilmThickness

Final Coat =One coat of Aliphatic Urethane at 2-3mils Dry FilmThickness

Application Method = Spray only for Primer Coat; Spray, Brush orRoller for Intermediate and/or Final Coat

*If equipment from the manufacturer has been coated with a primer coat, andthat primer coat meets the specifications above for Primer and is compatiblewith the intermediate coat, then only the intermediate and final coat will need

to be applied.

5.2.3 General Insulated Greater than -50F and Less than250F

Surface Preparation = SSPC SP-6 for Green Steel, SSPC SP-10 forsevere service, SSPC SP-7 for other services.

First Coat (Primer) = One coat of Epoxy Phenolic at 4-6 mils Dry FilmThickness

Application Method = Spray, Brush, Roller

5.2.4 General Insulated Greater than 250F and Less than750F

Surface Preparation = SSPC SP-10

First Coat (Primer) = One coat of Inorganic Zinc (Primer) or as anoption can use High Temperature Silicone at 4-6 mils Dry FilmThickness


5.2.5 General Insulated - Less than -50F and Greater than 750F

Surfaces that operate at these extreme temperatures need not be coated.This includes stainless steel surfaces with cold insulation (e.g. in cryogenicservice)


17/21




5.2.6 Insulated Cyclic 100 F to 650 F

This is typical conditions for dehydration vessels and piping. Surfaces thatoperator at these extreme temperature need not be coated. The challenge forany coating system is the expansion and contraction due to the frequent

thermal cycles.


Primer Coat = One coat of Inorganic Zinc at 2.5-4 mils Dry FilmThickness

Final Coat = Silicon at 1.0 to 2.0 mils Dry Film

Application Method = Spray

5.2.7 General Uninsulated, High Temp Surfaces

Greater than 250 F but less than 750 FSurface Preparation = SSPC SP-10

Final Coat (Primer) = One coat of Inorganic Zinc at 2.5-4 mils Dry FilmThickness


5.2.8 Atmospheric Tanks, Drums External Surfaces

Surface Preparation External Surfaces

Bare Metal = SSPC SP-10 Commercial Blast

To Coat Over a Manufacturers Primer = SSPC SP-2 or SP-3 fortouch-up and small areas. Also check compatibility betweenmanufacturers primer and final coat.

Primer Coat = One Coat Red Oxide 4-6 mils Dry Film Thickness

Final Coat = One Coat Industrial Oil Based Enamel at 2-3mils Dry FilmThickness (color according to Regulator Requirements)


5.2.9 Atmospheric Tanks External Surfaces - Tank Bottom

Tank bottoms and 18 up the sides will be coated to prevent externalcorrosion in those applications where the tank is placed directly incontact with soil and other applications where the design engineerdetermines this protection is appropriate.

Surface Preparation

Bare Metal = SSPC SP-10 Commercial Blast


18/21




To Coat Over a Manufacturers Primer - SSPC SP-2 or SP-3 fortouch-up of small areas. Also check compatibility betweenmanufacturers primer and final coat.

Coating = Two Coats Coal Tar Epoxy at 8 to 10 mils Dry FilmThickness each coat for a total of 16-20 mils. Entire bottom of tank and18 up on each side of tank.


5.2.10 Atmospheric Tanks Internal Surfaces - To MitigateInternal Corrosion

Internal coating of tanks will be performed on a case-by-case basis asdetermined by the design engineer to mitigate internal corrosion. Inmany cases, coating may only be required on the bottom and up thesides to a point above the expected water line. In other cases, the

entire internal surfaces may be coated to prevent corrosion from waterat the bottom of the tank and oxygen at the top.

Surface Preparation = SSPC SP-10 Commercial Blast

Coating = Two Coats Flake Filled Polyester Coating at 15 to 20 milsDry Film Thickness each coat for a total of 30-40 mils total. Coat bottomand sides to the appropriate distance to mitigate corrosion.


5.2.11 Stainless Steel

No coating required for uninsulated service.

For insulated service (hot service to 250F but excluding cryogenic services):


Final Coat =One Epoxy Phenolic at 6-8 mils Dry Film Thickness



19/21

Index



INDEX

Surface Cleaning Codes

SSPC-SP-1: Solvent Cleaning

Solvent cleaning is a procedure for removing detrimental foreign mattersuch as oil, grease, soil, drawing and cutting compounds, and othercontaminants from steel surfaces by use of solvents, emulsions,cleaning compounds, steam cleaning, or other materials and methodswhich involve a solvent or cleaning action.

SSPC-SP-2: Hand Tool Cleaning

Hand cleaning is a method of preparing steel surfaces for coating by

use of non-power tools. Hand cleaning removes loose mill scale, looserust, loose coating, and other loose detrimental foreign matter.

SSPC-SP-3: Power Tool Cleaning

Power tool cleaning is a method of preparing metal surfaces for coatingby removing loose mill scale, loose rust, and loose coat with power wirebrushes, power impact tools, power grinders, power sanders, or by acombination of these methods.

SSPC-SP-5 (NACE #1): White Metal Blast Cleaning

White metal blast cleaning is a method of preparing metal surfaces forpainting or coating by removing all mill scale, rust, rust scale, paint, orforeign matter by the use of abrasives propelled through nozzles or bycentrifugal wheels.

White metal is defined as a surface with gray-white, uniform metalliccolor, slightly roughened to form a suitable anchor pattern for coatings.The surface when viewed without magnification shall be free of all oil,

grease, dirt, and visible mill scale, rust corrosive products, oxides, paint,or other foreign matter. Heavy deposits of grease or oil shall be movedby No. 1 Solvent Cleaning prior to blasting.


20/21

Index



SSPC-SP-6 (NACE #3): Commercial Blast Cleaning

Commercial blast cleaning is a method of preparing metal surfaces forpainting or coating by removing mill scale, rust, rust scale, paint orforeign matter by the use of abrasives propelled through nozzles or bycentrifugal wheels.

A commercial blast metal is defined as one from which all oil, grease,dirt, rust scale, rust, mill scale, old paint, and foreign matter have beencompletely removed from the surface except for slight shadows,streaks, or discoloration caused by rust stain, mill scale oxides or slight,tight residues of paint or coating that may remain. If the surface ispitted, slight residues of rust or paint may be found in the bottom of thepits.

At least two-thirds of each square inch of surface area shall be free ofall visible residues mentioned above.

Nominal profile shall be 2-3 mils.

SSPC-SP-7 (NACE #4): Brush-Off Blast Cleaning

Brush-off blast cleaning is a method of preparing metal surfaces forpainting or coating by rapidly removing loose mill scale, loose rust, andloose paint to the degree hereafter specified by the impact of abrasivespropelled through nozzles or by centrifugal wheels. It is not intendedthat the surface shall be free of all mill scale, rust and paint. Theremaining mill scale, rust, and paint should be tight and the surfaceshould be sufficiently abraded to provide good adhesion and bonding of

coating.

SSPC-SP-10 (NACE #2): Near-White Blast Cleaning

Near-White Blast Cleaning is a method of preparing metal surfaces forpainting or coating by removing all mill scale, rust, rust scale, paint, orforeign matter by the use abrasives propelled through nozzles or bycentrifugal wheels.

A Near-White Blast Cleaned surface, when viewed withoutmagnification, shall be free of all visible oil, grease, dirt, dust, mill scale,rust, paint, oxides, corrosion products, and other foreign matter exceptfor staining.

Staining shall be limited to no more than 5 percent of each square inchof surface area and may consist of light shadows, slight streaks, orminor discoloration caused by stains of rust, stains of mill scale, orstains previously applied coating.


21/21

Index

Coating Selection Matrix

Service Temperature (oF) Surface Prep Primer Intermediate Final

General - Uninsulated

SP-7 (new),

SP-6 (green) EM (4-6 mils) - UR (2-3 mils)

General - Uninsulated >250 750 SP-10 (new) - - -

General - Insulated >-50-50

above ground coating may 2007.pdf

Documents