codes pipe le
TRANSCRIPT
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PIPING ELEMENTS
P. B. HIRAVE
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The piping system is the inter-connected
piping subject to the same set of designconditions. The piping system involves not
only pipes but also the fittings, valves and other
specialties. These items are known as piping
components. Code specifies the pipingcomponents as mechanical elements suitable
for joining or assembly into pressure-tight fluid-
containing piping systems.
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Components include …
1. Pipes
2. Fittings
3. Flanges
4. Gaskets
5. Bolting
6. Valves
7. Specialties
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Piping element is defined as any material or workrequired to plan and install the piping system.
Elements of piping include design specifications,
materials, components, supports, fabrication,
inspection and testing.
Piping specification is a document specifying each
of the components. Different material
specifications are segregated in different “Piping
Class”. Identification of the “Piping Classes”
depends on each Designer.
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The selection of piping material requires
knowledge of corrosion properties, strength and
engineering characteristics, relative cost andavailability.
The Piping Designer selects/designs the pipingcomponents based on the mechanical properties
such as the following.
a. Yield strengthb. Ultimate strength
c. Percentage elongation
d. Impact strength
e. Creep-rupture strengthf. Fatigue endurance strength
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Metallic
Ferrous Materials Non-Ferrous Materials
Copper Aluminium Nickel Lead
+ + +
Copper Aluminium Nickel
Alloys Alloys Alloys
Cast Carbon Alloy Stainless Special PVC CPVC PP HDPE UHMW-HDPE FRP PTFE LDPE LLDPE Glass Ceramic CementIron Steel Carbon Steel Alloys
Steel
LinedNon-Metallic
MSGL MSRL MS MS MS MS MS MS FRP
PTFE PP PVDF Cement Lead Ceramic PP
Lined Lined Lined Lined Lined Lined Lined
FIGURE 1.1
PIPING ELEMENTS
CLASSIFICATION BASED ON MATERIAL OF CONSTRUCTION
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Cast Carbon Alloy Stainless Special
Iron Steel Carbon Steel Alloys
Steel
Ferrous Materials Non-Ferrous Materials
Copper Aluminium Nickel Lead
+ + +Copper Aluminium Nickel
Alloys Alloys Alloys
Metallic
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Non-Metallic
PVC CPVC PP HDPE UHMW-HDPE FRP PTFE LDPE LLDPE Glass Ceramic Cement
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MSGL MSRL MS MS MS MS MS MS FRP
PTFE PP PVDF Cement Lead Ceramic PPLined Lined Lined Lined Lined Lined Lined
Lined
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CODE
A group of general rules or systematic procedures for design, fabrication,
installation and inspection prepared in such a manner that it can be adopted by
legal jurisdiction and made into law.
STANDARDS
Documents prepared by a professional group or committee which are
believed to be good and proper engineering practice and which contain mandatory
requirements.
RECOMMENDED PRACTICES
Documents prepared by professional group or committee indicating good
engineering practices but which are optional.
Companies also develop Guides in order to have consistency in the
documentation. These cover various engineering methods which are considered
good practices, without specific recommendation or requirements.
Codes and standards as well as being regulations, might be consideredas
“design aids” since they provide guidance from experts.
Each country has its own Codes and Standards. On global basis,
American National Standards are undoubtedly the most widely used and
compliance with those requirements are accepted world over. In India, other than
American Standards, British Standards and Indian Standards are also used for the
design and selection of equipment
and piping systems.
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MAJOR ORGANIZATION FOR STANDARDS
Sr. No. Country Organization
Abbreviation
1. USA American National ANSI
Standards Institute
2. Canada Canadian Standard CSA
Association
3. France Francaise AFNOR
4. United British Standards BSI
Kingdom Institute
5. Europe European Community CEN
for Standardization
6. Germany Deutsches Institute DIN
fur Normung
7. Japan Japanese Industrial JIS
8. India Bureau of Indian BIS Standards
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AMERICAN STANDARDS
1. American Petroleum Institute
2. American Iron and Steel Institute
3. American National Standard Institute
4. American Society of Mechanical Engineers
5. American Society of Testing Materials
6. American Welding Society
7. American Water Works Association
8. Manufacturers Standardization Society of
Valves and Fitting Industry – Standard Practices
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The American National Standards Institute‟s
standards used in the design of the Piping System are
as listed. ASME B 31. Code for Pressure piping is at
present a non-mandatory code in USA, though they
are adopted as legal requirement.
1)ASME B 31.1 - Power Piping
2)ASME B 31.2 - Fuel Gas Piping
3)ASME B 31.3 - Process Piping4)ASME B 31.4 - Pipeline
Transportation
System for liquid
hydrocarbon and otherLiquids
5)ASME B 31.5 - Refrigeration Piping
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6)ASME B 31.8 - Gas Transmission and
Distributor Piping
Systems.
7)ASME B 31.9 - Building Services
Piping
8)ASME B 31.11 - Slurry Transpiration
Piping Systems
9)ASME B 31.G - Manual for
determining
the remaining strength
of corroded piping -Asupplement to ASME
B31.
Of the above, the most commonly used code is ASME
B31.3. Refineries and chemical plants are designedbased on the same. All power plants are designed as
per ASME B31.1.
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AMERICAN STANDARD ASSOCIATIONS-
CODE FOR PROCESS PIPING
On global basis ANSI is undoubtedly the most
widely used and accepted code and compliance
with requirements of the same can be consideredas demonstrating the requirements of any branch
of piping engineering .
The American Standard for piping has its origin from1915 to 1925. The American Standards initiated
project B31 in March 1926, at the request of the
American Society of Mechanical Engineers and with
that Societyas the sole administrative sponsor.
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Because of the wide field involved, Sectional Committee
B31 was composed of representatives of some 40 different
engineering societies, industries, government bureaus,institutes and trade associations. After several years
work, the first edition was published in 1935 as an
American Tentative Standard Code for Pressure Piping.
To keep the Code abreast of current developments in
piping design, stress computations, new dimensional and
material standards and specifications, and increases in
the severity of service conditions, revisions, supplements,and new editions of the Code were published as ASA
B31.1 from 1942 through 1955. Many sub sections were
formed to deal with different field of Piping design such
as subsection 1 to deal with Power Piping and Sub section
3 to deal with Refinery piping etc.
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In 1952 a new section of the code was published to cover
gas transmission and distribution piping systems. In 1955a
decision was made to develop and publish other industrysections as separate Code Sections of the American
Standard Code for Pressure Piping. First separate
document published was B31.8 - 1955. The first edition of
Petroleum Refinery Piping was published as ASA B31.3,1959, superseding Section 3 of B 31.1 1955. Two
subsequent editions were publish as American Standards :
ASA B31.3 1962 and ASA B31.3 1966 .
During the period 1967-1969, the American StandardsAssociation was changed to the United Stated of American
Standards Institute. ASA Sectional Committees were
renamed American National Standards Committees and
the code became the American National Standard Code for
Pressure Piping .
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A new edition of Petroleum Refinery Piping, designated
ANSI B31.3- 1973, was published and periodically
revised through 1975.In 1974, after many years in development, a Code
Section for chemical plant piping designated B 31.6, was
ready for approval. It was decided, rather than publish
two closely related Code Sections, to combine therequirements of B31.3 and B31.6 in a new edition of
b31.3, titled Chemical Plant and petroleum Refinery
Piping. The new edition was published as ANSI B31.3-
1976, and was revised by five approved addenda upthrough August 1980.
In December 1978, American National Standard
Committee B31 was reorganized as the ASME code for
pressure Piping, B31Committee, under procedures
developed by the American Society of Mechanical
Engineers and accredited by ANSI.
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Addenda and new editions since that data have been
designated as ANSI/ASME B31. A new edition,ANSI/ASME B31.3-1980, was compiled from the 1976
Edition and its addenda, and editorially reorganized to
place the distinctive requirements for nonmetals in a
separate Chapter VIII.
In 1981, after several years in development, a code
Section for cryogenic piping, designated B 31.10 was
ready for approval. Again it was decided, rather thanpublishing two Code Sections with partially overlapping
scopes, to combine the requirements of B31.10with those
of B31.3.Part of this work has been done in several of
the approved addenda to the 1980 Edition : These were
consolidated in the 1984 Edition.
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The addenda to the 1984 Edition underwent significant
technical and editorial changes. Besides completing the
integration of cryogenic services, another separatechapter on high pressure piping was added. Additionally
Appendix A was reorganized to list the basic stress value
instead of SE (stress times joint efficiency) values. The
chapter on fabrication, examination and testing wereeditorially reorganized for uniformity among Code
Sections. These Addenda were consolidated in the
ANSI/ASME 31.3 1990 Edition.
The addenda to the 1987 Edition was mainly underwentsignificant technical and editorial change. Besides
completing the integration of piping was added.
Additionally Appendix A was reorganized to list the basic
stress value instead of SE (stress times joint efficiency)
values.
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The chapter on fabrication, examination and testingwere editorially reorganized for uniformity among
Code Sections. These Addenda were consolidated in
the ANSI/ASME 31.3 1987 Edition.
The addenda to the 1987 Edition was mainly for
keeping the code updated. Appendices for design of
expansion bellows and procedure for submitting
inquires were added. These Addenda were compiled
with extensive editorial revision in the ASME 31.31990 edition. Addenda to subsequent editions were
served to keep the code up to date.
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In a program to clarify the application of all
sections of the code for pressure piping, charges were made in
the Introduction & Scope statements of B 31.3 and its changed
to Process Piping in the 1996 edition.
Under directions of ASME Codes and Standards
management, metric units of measurements are being
emphasized. With certain exceptions, SI metric units are listed
first in 1996 edition and are designated as standard.Instructions for conversion are given where metric data are
not available. U S Customary Units are also given. By given
agreement, either system may be used.
New editors are published every three years and
addenda to the new editions every year. Revisions and addendaare not retroactive. Latest addenda issued six months prior to
original extract date shall govern, unless agreement is made
between extracting parties. Hence mandatory date is indicated
in code as exactly six months after the issue date.
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The latest editions of code available as of now are
B31.1 2001B31.2 1968 (see note)
B31.3 2002
B31.4 1998
B31.5 2001B31.8 1999 20XX
B31.9 1996
B31.11 1989
Note : USAS B31.2-1968 was withdrawn as an American
National Standard on February 18, 1988.ASME will
continue to make available USAS 31.2 1968 as a historical
document for a period of time.
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More of 31.3
The intent of the Code ASME B31.3 is to set forth
engineering requirements deemed necessary for
design and construction of piping installation.
The Code prescribe requirements for the materials,
design, fabrication, assembly, erection, examination,
inspection and testing of piping systems subject topressure of vacuum.
1 1 API STANDARDS
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1.1 API STANDARDS
The generally referred API standards by the Piping Engineers
are :
1) API 5L - Specification for Line Pipe
2) API 6D - Pipe line Valves, End closures,
Connectors and Swivels.
3) API 6F - Recommended Practice for Fire Test for valves.
4) API 593 - Ductile Iron Plug Valves – flanged
ends.
5) API 598 - Valve Inspection and Test.
6) API 600 - Steel Gate Valves
7) API 601 - Metallic Gasket for Refinery piping
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8) API 602 - Compact Design carbon steel Gate.
9) API 604 - Ductile Iron Gate Valves – flanged
ends.
10) API 605 - Large Diameter Carbon Steel Flanges
11) API 607 - Fire test for soft-seated ball valves
12) API 609 - Butterfly valves
13) API 1104 - Standard for welding pipeline andfacilities.
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1.2 AISI STANDARDS
The American Iron and Steel Institute Standards specifies thematerial by its chemical and physical properties. When specific
model of manufacture of the element is not to be specified, then the
material can be identified by the AISI standards. The most
commonly used AISI specifications are:
1) AISI 410 - 13% Chromium Alloy
Steel
2) AISI 304 - 18/8 Austenitic
Stainless Steel
3) AISI 316 - 18/8/3 Austenitic
Stainless Steel
1 3 ANSI STANDARDS
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1.3 ANSI STANDARDS
The American National Standards Institute’s standards used
in the design of the Piping Systems are as listed. ASME B 31. Code
for Pressure piping is at present a non-mandatory code in USA,though they are adopted as legal requirement.
1) ASME B 31.1 - Power Piping
2) ASME B 31.2 - Fuel Gas Piping
3) ASME B 31.3 - Process Piping
4) ASME B 31.4 - Pipeline Transportation
System for liquid
hydrocarbon and other
Liquids
5) ASME B 31.5 - Refrigeration Piping
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6) ASME B 31.8 - Gas Transmission and
Distributor Piping Systems.
7) ASME B 31.9 - Building Services Piping
8) ASME B 31.11 - Slurry Transpiration Piping
Systems9) ASME B 31.G - Manual for determining the
remaining strength of
corroded piping - supplement
to ASME B31.
Of the above, the most commonly used code is ASME B 31.3.
Refineries and chemical plants are designed based on the same. All
power plants are designed as per ASME B 31.1.
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Of the above, the most commonly used code is ASME B 31.3.
Refineries and chemical plants are designed based on the same. All
power plants are designed as per ASME B 31.1.
Other major ASME standards referred for the piping elements are:
1) ANSI B 1.1 - Unified Inch Screw Threads
2) ASME B 1.20.1 - Pipe Threads general purpose – (Ex ANSI
B2.1)3) ASME B 16.1 - Cast Iron Pipe Flanges and Flanged Fittings
4) ASME B 16.3 - Malleable Iron Threaded Fittings.
5) ASME B 16.4 - Cast Iron Threaded Fittings
6) ASME B 16.5 - Steel Pipe flanges and Flanged Fittings
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7) ASME B 16.9 - Steel Butt welding Fittings
8) ASME B 16.10 - Face to face and end to end dimensions
of Valves
9) ASME B 16.11 - Forged steel Socket welding and
Threaded fittings
10) ANSI B 16.20 - Metallic Gaskets for pipe flanges – ring
joint, spiral wound and jacketed flanges
11) ASME B 16.21 - Non Metallic Gasket for pipe flanges
12) ASME B 16.25 - Butt Welding Ends
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13)ASME B 16.28 - Short Radius Elbows and Returns
14)ASME B 16.34 - Steel Valves, flanged and butt welding ends.
15)ASME B 16.42 - Ductile Iron Pipe Flanges & Flanged
Fittings – Class 150 and 300
16)ASME B 16.47 - Large Diameter Steel Flanges – NPS 26-60
17)ASME B 18.2 1 & 2 - Square and hexagonal head Bolts and Nuts
– (in & mm)
18)ASME B 36.10 - Welded and seamless Wrought Steel Pipes
19)ASME B 36.19 - Welded and Seamless Austenitic Stainless
Steel Pipes.
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1.4 ASTM STANDARDS
ASTM standards consist of 16 sections on definitions and
classifications of materials of construction and test methods. Most
of the ASTM standards are adapted by ASME and are specified in
ASME Section II. The Section II has four parts.
1.4.1 Part-A - Ferrous materials specifications
1.4.2 Part-B - Non-ferrous metals specification1.4.3 Part-C - Specification for welding materials
1.4.4 Part-D - Properties of materials.
In Part-II, the materials are listed in the Index based on the available
forms such as plates, castings, tubes, etc. and also on the numericalindex.
The selection of ASTM specification depends upon the
required manufacturer, form of material, its mechanical strength and
the corrosion properties.
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The specification number is given on Alphabetical prefix, ‘A’ for
Ferrous materials and ‘B’ for Non-ferrous materials. ASTM also
specifies standard practice for numbering metal and alloys asUnified Numbering System.
Unified Numbering System (UNS) establishes 18 series
numbers of metals and alloys. Each UNS number consists of a
single letter prefix followed by five digits. In most cases thealphabet is suggestive of the family of the metal identified.
1. A00001 - A 99999 - Aluminium and Aluminium
alloys
2. C00001 - C 99999 - Copper and Copper alloys
3. E00001 - E 99999 - Rare earth and rare earth
like metals and alloys
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4. L00001 - L 99999 - Low melting metals
and alloys
5. M00001 - M 99999 - Miscellaneousnonferrous metals and
alloys
6. N00001 - N 99999 - Nickel and Nickel
alloys
7. P00001 - P 99999 - Precious metals and
alloys
8. R00001 - R 99999 - Reactive and
Refractory metals and
alloys
9. Z00001 - Z 99999 - Zinc and Zinc alloys
10. D00001 - D 99999 - Specified mechanical
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10. D00001 D 99999 Specified mechanical
properties of Steels
11. F00001 - F 99999 - Cast Iron and Cast Steels
12. G00001 - G 99999 - AISI and SAE Carbon and
Alloy steels
13. H00001 - H 99999 - AISI H Steels
14. J00001 - J 99999 - Cast Steels
15. K00001 - K 99999 - Miscellaneous Steels and
Ferrous alloys
16. S00001 - S 99999 - Stainless Steels
17. T00001 - T 99999 - Tool Steels
18. W00001 - W99999 - Welding Filler Metals andElectrodes
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1.5 AWS STANDARDS
The American Welding Society (AWS) standards provide
information on welding fundamentals; weld design, welders’ training qualification, testing and inspection of welds and guidance
on the application and use of welds. Individual electrode
manufacturers have given their own brand names for the various
electrodes and are sold under these names.
1.6 AWWA STANDARDS
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1.6 AWWA STANDARDS
The American Water Works Association (AWWA) standards
refer to the piping elements required for low-pressure water services.
These are less stringent than other standards. Valves, flanges, etc.required for large diameter water pipelines are covered under this
standard and are referred rarely by piping engineers here.
1) C-500 - Gate Valves for water & sewage system
2) C-510 - Cast Iron Sluice Gates
3) C-504 - Rubber Seated Butterfly Valves
4) C-507 - Ball valves 6” – 48”
5) C-508 - Swing Check Valves 2” – 24”
6) C-509 - Resilient Seated Gate Valves for water &sewage
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1.7 MSS-SP STANDARDS
In addition to the above standards and material codes, there are standard
practices followed by manufacturers. These are published as advisorystandards and are widely followed. The most common MSS-SP
standards referred for piping are:
1) MSS-SP-6 - Standard Finishes for Contact Surface for
Flanges2) MSS-SP-25 - Standard Marking System for Valves, Fittings
Flanges
3) MSS-SP-42 - Class 150 Corrosion Resistant Gate, Globe and
Check Valves.
4) MSS-SP-43 - Wrought Stainless Steel Buttweld Fittings5) MSS-SP-56 - Pipe Hanger Supports: Materials, Design and
Manufacture
6) MSS-SP-61 - Pressure testing of Valves
7) MSS-SP-67 - Butterfly Valves8) MSS-SP-68 - High Pressure Offseat Butterfly Valves
9) MSS-SP-69 - Pipe Hanger Supports:
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) p g pp
Selection and application
10) MSS-SP-70 - Cast Iron Gate Valves
11) MSS-SP-71 - Cast Iron Check Valves
12) MSS-SP-72 - Ball Valves
13) MSS-SP-78 - Cast Iron Plug Valves
14) MSS-SP-80 - Bronze Gate, Globe and Check Valves
15) MSS-SP-81 - Stainless Steel Bonnetless Knife Gate
Valves
16) MSS-SP-83 - Pipe Unions
17) MSS-SP-85 - Cast Iron Globe Valves
18) MSS-SP-88 - Diaphragm Valves
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19) MSS-SP-89 - Pipe Hangers and
Supports: Fabrication and
installation practices.
20) MSS-SP-90 - Pipe Hangers and
Supports: Guidelines on
terminology
21) MSS-SP-92 - MSS Valve user guide
22) MSS-SP-108 - Resilient Seated Eccentric
CI Plug Valves.
2 0 BRITISH STANDARDS
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2.0 BRITISH STANDARDS
In many instances, it is possible to find a British Standard,
which may be substituted for American Standards. For example, BS
2080 – British Standard for Face to Face / End-to-End dimensions of
valves is identical to ASME B16.10. Similarly BS 3799 and ASME B
16.11 also compare.
There are certain British Standards referred by IndianManufacturers for the construction of piping elements such as valves.
The most commonly referred British standards in the Piping Industry
are:
1) BS 10 - Flanges (obsolescent)
2) BS 806 - Pipes and Fittings for boilers
3) BS 916 - Black Bolts, Nuts and Screws
(obsolescent)
4) BS 970 - Steel for forging, bars, rods, valve steel,
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) g g
etc.
5) BS 1212 - Specification for float operated Valves
6) BS 1306 - Copper and Copper alloy pressure piping
system
7) BS 1414 - Gate Valves for petroleum industry
8) BS 1560 - Steel Pipe Flanges (class designated)
9) BS 1600 - Dimensions of Steel Pipes
10) BS 1640 - Butt Welding Fittings
11) BS 1740 - Wrought steel screwed pipe fittings
12) BS 1868 - Steel Check Valves for petroleumindustry
13) BS 1873 - Steel Globe & Check Valves for
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petroleum industry
14) BS 1965 - Butt welding pipe fittings
15) BS 2080 - Face to Face / End to End dimensions
of Valves
16) BS 2598 - Glass Pipelines and Fittings
17) BS 2995 - SW and Screwed valves – 2” and
Smaller (withdrawn, superseded by
BS 5352)
18) BS 3059 - Boiler and Super Heater tubes
19) BS 3063 - Dimensions of Gaskets for pipe
flanges (obsolescent)
20) BS 3351 - Piping System for petroleum
refineries – (withdrawn)
21) BS 3381 - Metallic Spiral Wound Gaskets
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22) BS 3600 - Dimensions of Welded and Seamless
Pipes &Tubes.
23) BS 3601 - C.S. Pipes & Tubes for pressure purposes at room temperature
24) BS 3602 - C.S. Pipes & Tubes for pressure
purposes at high temperature
25) BS 3603 - C.S. and Alloy steel Pipes & Tubes
for pressure purposes at low
temperature.
26) BS 3604 - Alloy steel Pipes & Tubes for high
temperature
27) BS 3605 - S.S. Pipes & Tubes for pressure
purposes
28) BS 3799 - SW/Screwed Fittings29) BS 3974 - Pipe hangers, Slides & Roller type
Supports.
30) BS 4090 - CI Check Valves for general purpose
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(withdrawn).
31) BS 4346 - PVC pressure Pipe – joints & Fittings
32) BS 4504 - Steel, CI & Copper alloy Flanges (PN
designated).
33) BS 5146 - Inspection and Testing of valves
(withdrawn, superseded by BS6755)
34) BS 5150 - CI Wedge and Double Disc Gate Valves
for general purposes
35) BS 5151 - CI Gate (parallel slide) valves for general
purposes
36) BS 5152 - CI Globe & Check valves for general
purposes.
37) BS 5153 CI Check valves for general purposes
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37) BS 5153 - CI Check valves for general purposes.
38) BS 5154 - Copper alloy Gate, Globe, Check
valves
39) BS 5155 - CI and CS Butterfly valves for general
purposes
40) BS 5156 - Diaphragm valves for general purposes
41) BS 5157 - Steel Gate (parallel slide) valves for
general purposes
42) BS 5158 - CI and CS Plug valves for general
purposes
43) BS 5159 - CI and CS Ball valves for general
purposes
44) BS 5160 - Flanged steel Globe and
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Check valves for general purposes
45) BS 5163 - Double flanged Cast Iron wedge gate
valves for water works purposes.
46) BS 5351 - Steel Ball Valves for petroleum
industries
47) BS 5352 - Steel Gate, Globe, Check Valves < 2” NB
48) BS 5353 - Specification for Plug Valves
49) BS 5222 - Aluminium Piping Systems (withdrawn)
50) BS 5391 - Specification for ABS Pressure Pipes
51) BS 5392 - Specification for ABS Fittings
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52) BS 5433 - Specification for underground Stop Valves for water services
53) BS 5480 - Specification for GRP Pipes and Fittings
54) BS 6364 - Specification for Valves for cryogenic services
55) BS 6755 - Testing of valves
56) BS 6759 - Safety Valves
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3.0 INDIAN STANDARDS
Bureau of Indian Standards (BIS) have so far not developed
an Indian standard for the design of Piping Systems. Hence, ANSIstandards ANSI B 31.1/31.3 are widely referred for the design. These
standards also accept materials covered in other standards. Unlike
American Standards, Indian Standards cover dimensions and material
specifications under the same standard. There are also no groupings
done based on the series/branch of engineering as well. Some of themost commonly referred Indian Standards by the Piping Engineers are:
1) IS – 210 - Grey Iron Castings
2) IS – 226 - Structural Steel (superseded by IS 2062)
3) IS - 554 - Dimensions of Pipe Threads
4) IS – 778 - Specification for Copper Alloy Gate, Globe andCheck Valves.
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5) IS – 780 - Specification for Sluice Valves – 50 NB to 300 NB
6) IS 1239 - Specification for Mild Steel Tubes and Fittings.
Part I & II
7) IS 1363 - Hexagonal bolts, screws and nuts – Grade C
8) IS 1364 - Hexagonal bolts, screws and nuts – Grade A & B
9) IS 1367 - Technical supply conditions for threaded steel
fasteners
10)IS 1536 - Centrifugally Cast Iron Pipes
11)IS 1537 - Vertically Cast Iron Pipes
12)IS 1538 - Cast Iron Fittings
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13) IS 1870 - Comparison of Indian and Overseas Standards
14) IS 1879 - Malleable Iron Pipe Fittings
15) IS 1978 - Line Pipe
16) IS 1979 - High Test Line Pipe
17) IS 2002 - Steel Plates
18) IS 2016 - Plain Washers
19) IS 2041 - Steel Plates for pressure vessel used at moderate
and low temperature
20) IS 2062 - Steel for general structural purposes
21) IS 2379 - Colour code for identification of pipelines
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31) IS 4853 Radiographic e amination of b tt eld
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31) IS 4853 - Radiographic examination of butt weld
joints in pipes.
32) IS 4864 to IS 4870 - Shell Flanges for vessels and equipment
33) IS 4984 - Specification for HDPE Pipes for water
supply
34) IS 4985 - Specification for PVC Pipes
35) IS 5312 - Specification for Swing Check Valves
36) IS 5572 - Classification of hazardous area for
electrical installation
37) IS 5822 - Code of practice for laying welded
steel pipes
38) IS 6157 - Valve Inspection and Test
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39) IS 6286 - Seamless and Welded Pipe for subzero
temperature
40) IS 6392 - Steel Pipe Flanges
41) IS 6630 - Seamless Alloy Steel Pipes for high temperature
services
42) IS 6913 - Stainless steel tubes for food and beverageindustry
43) IS 7181 - Horizontally Cast iron pipes
44) IS 7240 - Code of practice for cold insulation
45) IS 7413 - Code of practice for hot insulation
46) IS 7719 - Metallic spiral wound gaskets
47) IS 7806 SS Castings
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47) IS 7806 - SS Castings
48) IS 7899 - Alloy steel castings for pressure services
49) IS 8008 - Specification for moulded HDPE Fittings
50) IS 8360 - Specification for fabricated HDPE Fittings
51) IS 9890 - Ball Valves for general purposes
52) IS 10221 - Code of practice for coating and wrapping of
underground MS pipelines
53) IS 10592 - Eye wash and safety showers
54) IS 10605 - Steel Globe Valves for petroleum industries
55) IS 10611 - Steel Gate Valves for petroleum industries
56) IS 10711 - Size of drawing sheets
57) IS 10805 Foot Valves
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57) IS 10805 - Foot Valves
58) IS 10989 - Cast/Forged Steel Check Valves for petroleum
industries
59) IS 10990 - Technical drawings – Simplified representation
of pipelines.
60) IS 11790 - Code of practice for preparation of Butt weldingends for valves, flanges and fittings.
61) IS 11791 - Diaphragm Valves for general purposes
62) IS 11792 - Steel Ball Valves for petroleum industries
63) IS 13049 - Specification for Diaphragm type flat operated
Valves.
64) IS 13095 - Butterfly Valves
65) IS 13257 Ring type joint Gasket and Grooves for
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65) IS 13257 - Ring type joint Gasket and Grooves for
flanges.
66) IS 14333 - HDPE pipes for sewerage purposes
There are certain other international standards also
referred in the piping industry. They are the DIN standards of
Germany and the JIS standards of Japan. DIN standards are more
popular and equivalent British and Indian standards are alsoavailable for certain piping elements.
Periodic review of the standards by the committee is held
and these are revised to incorporate the modified features based on
the results of research and feedback from the industry. Althoughsome technological lags are unavoidable, these are kept minimum
by those updations. Hence, it is necessary that the latest editions of
the codes and standards are referred for the design and year of
publication also to be indicated along with.
Th A i N i l S d d I i ’ d d d
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The American National Standards Institute’s standards used
in the design of the Piping Systems are as listed. ASME B 31. Code
for Pressure piping is at present a non-mandatory code in USA,
though they are adopted as legal requirement.
1) ASME B 31.1 - Power Piping
2) ASME B 31.2 - Fuel Gas Piping
3) ASME B 31.3 - Process Piping
4) ASME B 31.4 - Pipeline Transportation System for liquid
hydrocarbon and other Liquids
5) ASME B 31.5 - Refrigeration Piping
6) ASME B 31.8 - Gas Transmission and Distributor Piping
Systems.
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7) ASME B 31.9 - Building Services Piping
8) ASME B 31.11 - Slurry Transpiration Piping Systems
9) ASME B 31.G - Manual for determining the remaining
strength of corroded piping- A supplement
to ASME B31.
Of the above, the most commonly used code is ASME B
31.3. Refineries and chemical plants are designed based on the
same. All power plants are designed as per ASME B 31.1.
This Code prohibits designs and practices known to be
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This Code prohibits designs and practices known to be
unsafe and contains warnings where caution, but not
prohibition, is warranted. The Code applies to piping
for all fluids, including
1. Raw, Intermediate, and finished chemicals
2. Petroleum products
3. Gas, steam, air and water
4. Fluidized solids and
5. Refrigerants Except;
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a) Packaged equipment piping which may be to
B31.3 or B31.5 if it is refrigeration package.
b) Boiler external piping which is required to
conform to B31.1.
c) Tubes, tube headers, cross overs and
manifolds of fired heaters which are
internal to heater enclosures.
d) Internal piping of pressure vessels, heat
exchangers, pumps, compressors and
other fluid handling or process equipmentincluding connection for external piping.
e) Piping which has been set aside for pipe lines
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e) Piping which has been set aside for pipe lines
conforming to B31.4, B31.8, B31.11 or applicable
government regulations but located in company
property.
f) Plumbing, sanitary sewers and storm water
sewers.
g) Fire hydrant system piping.
h) Piping system designed for internal Gauge
pressure at or above zero but less than 15 psig
provided the fluid handled is nonflammable, non
toxic and not damaging to human tissue and its
design temperature is from – 20 0F ( -290 C )
through 3660F (186 0C ).
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Please note:
The Code is not a design hand book; it does not do awaywith the need for the design engineer or for competent
engineering judgement.
Computability of materials with the service and hazards
from the instability of contemned fluids are not with in
the scope of the Code. As a matter of published policy
ASME does not approve, certify rate or endorse any
item, construction, proprietary device or activity and
also does not act as a consultant on specific engineering
problems or understanding the code rules. Requests for
revision and interpretation of code shall be per
appendix Z.
SPECIFICATIONS AND STANDARDS
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SPECIFICATIONS AND STANDARDS
ACCEPTED BY ASME B 31.3
1 ANSI - American National StandardInstitute
2 API - American Petroleum Institute
3 ASCE - American Society of Civil Engineers
4 ASME - American Society of Mechanical
Engineers
5 ASNT - American Society for Non
destructive Testing
6 ASTM - American Society for Testing
Materials
8 AWS A i W ldi S i t
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8 AWS - American Welding Society
9 CDA - Copper Development Association
10 CGA - Compressed Gas Association
11 EJMA - Expansion Joint Manufactures
Association
12 ICBO - International Conference of Building
Officials Earlier Known as UBC –
Uniform Building Code
13 MSS - Manufacturers Standardization Society
of the Valve and fitting Industry
14 NACE - National Association of Corrosion
Engineers
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15 NAFA - National Fire Protection Association
16 NIST - National Institute of Standards and
Technology Earlier known as NBS – National Bureau of Standards
17 PFI - Pipe Fabrication Institute
18 PPI - Plastic Pipe Institute
19 SAE - Society of Automotive Engineers
ASME BOLIER AND PRESSURE VESSEL CODE
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ASME BOLIER AND PRESSURE VESSEL CODE
Sections:
1. Power Boilers
2. Materials
Part A- Ferrous MaterialPart B- Now Ferrous Materials
Part C- Welding Electrodes & Filler Materials
Part D- Properties
3. Nuclear power plant components
4. Heating boilers
5. Non destructive examination
6. Recommended rules for care and operation of heating
boilers
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7. Recommended guidelines for care of powerboilers mended
8. Pressure Vessels
Division – 1Division – 2 Alternative Rules
9. Welding and brazing qualifications
10. Fibre reinforced plastic pressure vessels
11. Rules for in service inspection of nuclear power
plant components
ASTM STANDARS
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ASTM STANDARS
ASTM has 16 sections 71 Volumes
Section 0 - Index
Section 1 - Iron & Steel Product
- 7 Volumes - 736 Standards
Section 2 - Non Ferrous Metal & Products- 5 Volumes - 678 Standards
Section 3 - Metal Test Methods & Analytical Procedures
-6Vol - 651 standards
Section 4 - Construction-10 Volumes - 1601 standards
Section 5 - Petroleum Products Lubricants etc
- 5Volumes - 577 standards
Section 6 - Paints, Related Coatings & Aromatics
- 4 Volumes - 795 Standards
Section 7 - Textiles
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-2 Vol - 325 Standards
Section 8 - Plastics
- 4 Vol - 556 Standards
Section 9 - Rubber
- 2 Vol - 287 Standards
Section10 - Electric Insulation & Electronics
- 5 Vol - 487 Standards
Section 11- Water & Environmental Technology- 2 Vol - 763 Standards
Section 12- Nuclear, Solar & Geothermal energy
- 2 Vol - 248 Standards
Section 13- Medical Device & Services
- 1Vol.Section 14- General Methods & Instrumentation
- 3 Vol - 336 Standards
Section 15- General Products, Chemical Specialties
& end use products
- 9 Vol - 1498 Standards
UNIFIED NUMBERING SYSTEM (UNS)
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( )
Establishes 18 Series numbers of metals and alloys. Each
UNS number consists of a single letter prefix followed by five
digits. In most cases the alphabet is suggestive of the formulaof metal identified.
1. A00001 – A99999 – Aluminum & Al. Alloys.
2. C00001 – C99999 – Copper & Copper alloys.3. E00001 – E99999 – Rare earth & rare earth like
metal & Alloys.
4. L00001 – L99999 – Low methug metals & alloys
5. M00001 – M99999 – Miscellaneous non ferrous metal
&Alloys.
6. N00001 – N99999 - Nickel & nickel alloys
7. P00001 – P99999 - Precious Metals & alloys
8. R00001 – R99999 - Reactive & refractory metal &
alloys.
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9. Z - - Zinc & Zinc alloys
10. D - - Specified Mech. Properties of Steels.11. F - - Cast Iron & Cast Steels.
12. G - - AISI & SAE Carbon & alloys Steels.
13. H - - AISIH Steels.
14. J - - Cast Steels.15. K - - Misc steels & Ferrous alloys.
16. S - - Stainless Steels.
17. T - - Tool Steels.
18. W - - Welding Filler Metal &
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The basic material or the generic material of construction is
specified by the Process Licenser for the process fluids. The
Piping Engineer is expected to detail out the same based on theCodes and Standards.
The Piping Design Criteria originates from the Line List
which specifies design conditions with respect to pressure andtemperature.
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In absence of this data, the Piping Engineer considers the
following for strength calculations
Design Pressure as 10% higher than the maximum
anticipated operating pressure.
Design Temperature as 25° above the maximumanticipated operating temperature.
When operating temperature is 15°C and below, the
design temperature as the anticipated minimum
operating temperature.
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The design should meet the requirements of the relevant code.
The material used shall be in accordance with latest revision
of standards.
If ASTM materials are used, then the materials adapted byASME/ANSI should be preferred.
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The selection of materials in general shall follow the
norms below:
a) Carbon steel shall be used up to 800oF
(425oC).
b) Low temperature steel shall be used below -20oF (- 29oC)
c) Alloy carbon steel shall be used above 8000F
(425oC).
d) For corrosive fluids, recommendations from the
Process Licensor to be followed.
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In American standard, the pipes are covered
under
a) ASME B 36.10 - Welded and Seamless
Wrought Steel Pipe
b) ASME B 36.19 - Stainless Steel Pipe
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Pipe Size Eq. Metric Outside Outside
NB (Inch) Pipe Size Dia (inch) Dia (inch)
NB (mm)1/8 6 0.405 10.3
1/4 8 0.540 13.7
3/8 10 0.675 17.1
1/2 15 0.840 21.3
3/4 20 1.050 26.71 25 1.0315 33.4
*11/4 32 1.660 42.2
11/2 40 1.900 48.3
2 50 2.375 60.3
*21/2 65 2.875 73.0
3 80 3.500 88.9
*31/2 90 4.000 101.6
4 100 4.500 114.3
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*5 125 5.563 141.3
6 150 6.625 168.38 200 8.625 219.1
10 250 10.750 273.0
12 300 12.250 323.9
14 350 14.000 355.6
16 400 16.000 406.4
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Stainless steel pipes are available in schedule 5S, 10S,
40S and 80S whereas carbon steel pipes are available
in schedule 10, 20, 30, 40, 60, 80, 100, 120, 140, 160,
STD,XS, XXS.
The figures indicated in these standards are the nominalthickness and mill tolerance of 12.5% is applicable to
those values.
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Generally the thickness specified by schedule numbers
of B36.10 covers pipe sizes upto 80 inch(2000 mm) NB
and B36.19 covers pipe sizes upto 24 inch(600 mm) NB
match except in the followings:
10" SCH80 / SCH80S
12" SCH40 / SCH40S
12" SCH80 / SCH80S
14" SCH10 / SCH10S16" SCH10 / SCH10S
18" SCH10 / SCH10S
20" SCH10 / SCH10S
22" SCH10 / SCH10S
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Pipe Ends
Based on the material of construction and the pipe
to pipe joint, the ends of the pipes are specified as
follows.
Beveled ends
Plain ends
Screwed ends
Flanged ends
Spigot/Socket ends
Buttress ends
BUTT WELD PIPE JOINTS
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Advantages
a) Most practical way of joining big bore pipingb) Reliable leak proof joint
c) Joint can be radiographed
Disadvantages
a) Weld intrusion will affect flowb) End preparation is necessary
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SOCKET WELD PIPE JOINTS
a) Easier Alignment than butt welding
b) No weld metal intrusion into bore
Disadvantages
a) The 1/16"(1.5 mm) recess pockets liquid
b) Use not permitted by code if Severe Erosion
or Crevice Corrosion is anticipated.
Advantages
SCREWED PIPE JOINTS
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SCREWED PIPE JOINTS
Advantages
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a) Easily made at site
b) Can be used where welding is not permitted due
to fire hazard
Disadvantages
a) Joint may leak when not properly sealed
b) Use not permitted by code if severe erosion,
crevice corrosion,shock or vibration are
anticipated.
c) Strength of pipe is reduced as threads reduce
wall thicknessd) Seal welding may be required
e) Code specifies that seal welding shall not be
considered to contribute for strength of joint
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FLANGED PIPE JOINTS
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Advantages
a) Can be easily made at site
b) Can be used where welding is not permitted due to
material properties or fire hazard.
c) Dismantling is very easy
Disadvantages
a) It is a point of potential leakage
b) Cannot be used when piping is subjected to high
bending moment.
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SPIGOT SOCKET PIPE JOINTS
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Advantages
a) Can be easily made at site.
b) Can accept misalignment upto 10o at pipe joints.
Disadvantages
a) Suitable for low pressure application.
b) Special configuration at pipe ends required.
BUTTRESS END PIPE JOINTS
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Used only for glass piping and not capable to hold highpressure.
Types Of Pipes
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Based on the method of manufacture pipes could be
classified as;
Seamless
Welded
o Electric Resistance Welded (ERW)
o Electric Fusion Welded (EFW)
o Spiral Welded
o Furnace Butt weldedo Double Submerged Arc Welded
Forged and Bored
Pipe Materials
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1. ASTM A53 : Welded and Seamless Steel
Pipe
Black and Galvanized2. ASTM A106 : Seamless CS Pipe for High
Temp. Services
3. ASTM A120 : Black and Hot Dipped Zinc
coated (Galvanized) weldedand seamless pipe for ordinary
use
4. ASTM A134 : Electric fusion welded steel
plate pipe (Sizes
16” NB)5. ASTM A135 : Electric resistance welded pipe
6. ASTM A155 : Electric fusion welded steel
pipe for high temperature
service
7. ASTM A312 : Seamless and welded
austenitic stainless steel pipes
8. ASTM A333 : Seamless and welded steel
pipe for low temperature
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pipe for low temperature
service
9. ASTM A335 : Seamless ferric alloy steel
pipe for high temperature
service
10. ASTM A358 : Electric fusion welded
austenitic chrome-nickel steel
pipe for high temperature
service
11. ASTM A369 : Carbon and ferric alloy steel
forged and bored for high
temperature service12. ASTM A376 : Seamless austenitic steel pipe
for high temperature central
station service
13. ASTM A409 : Welded large diameter
austenitic steel pipe for
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p p
corrosive or high temperature
service
14. ASTM A426 : Centrifugally cast ferric alloysteel pipe for high temperature
service
15. ASTM A430 : Austenitic steel forged and
bored pipe for hightemperature service
16. ASTM A451 : Centrifugally cast austenitic
steel pipe for high temperature
service17. ASTM A452 : Centrifugally cast austenitic
steel cold wrought pipe for high
temperature service
18. ASTM A524 : Seamless carbon steel pipe foratmospheric and low
temperature services
19. ASTM A587 : Electric welded low carbon steel
pipe for the chemical industry
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20. ASTM A660 : Centrifugally cast carbon steel
pipe for high temperature service
21. ASTM A671 : Electric fusion welded steel pipefor atmospheric and low
temperature service
(Sizes 16” NB)
22. ASTM A672 : Electric fusion welded steel pipefor high pressure service at
moderate temperature services
(Sizes 16"NB)
23. ASTM A691 : Carbon and alloy steel pipe,electric fusion welded for high
pressure service at high
temperatures (Sizes 16" NB)
24. ASTM A731 : Seamless and welded ferric
stainless steel pipe
25. ASTM A790 : Seamless and welded ferritic/
austenitic stainless steel pipe
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austenitic stainless steel pipe
26. ASTM A813 : Single or double welded
austenitic stainless steel pipe27. ASTM A814 : Cold worked welded austenitic
stainless steel pipe
28. ASTM F1545 : Plastic Lined Ferrous Pipe
29. API 5L : Line pipe
30. IS 1239 : Steel pipes for general purposes
(Sizes 6" NB)
31. IS 1536 : Centrifugally cast iron pipe
32. IS 1537 : Vertically cast iron pipe
33. IS 1978 : Line pipe34. IS 1979 : High test line pipe
35. IS 3589 : Steel pipe for general services
36. IS 4984 : HDPE pipe
37. IS 4985 : PVC pipe
THICKNESS OF STRAIGHT PIPE UNDER
INTERNAL PRESSURE
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INTERNAL PRESSURE
ASME B 31.3, the Process Piping Code, in clause304.1.1 gives minimum thickness as follows:
Tm = T + C
PD
Where, T =
2 (SE + PY)
Where,
P = Internal Design gauge pressure psig
(kg/mm2g)D = Outside Diameter of pipe
inch (mm)
S = Allowable Stress from
Appendix A – 1 psi (kg/cm2)E = Joint Quality factor from Table A – 1B
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Y = Coefficient from 304.1.1
C = C1 + C2
C1 = Corrosion Allowance
= 1.6 mm in general for carbon steel= 0 for stainless steel
C2 = Depth of thread (used only upto 1½” NB)
The calculated thickness to be corrected
to consider the mill tolerance of - 12.5%as 8 PD
Tm = + C1 + C2
7 2(SE + PY)
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The use of the above equation is best illustrated by means of
the following example.
Example:
A 12" (300 mm) NB pipe has an internal maximum
operating pressure of 500 psig (35kg / cm2g) and
temperature of 6750F. The material of construction o f the
pipe is seamless carbon steel to ASTM A106 Gr B. The
recommended corrosion allowance is 1/8" (3mm). Calculate
the thickness of pipe as per ASME B 31.3 and select the
proper schedule.PD
Tm = + C
2 (SE + PY)
P = 10% higher than the MWP
= 1 1 x 500 = 550 psig
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= 1.1 x 500 = 550 psig
D = 12.75" (OD of 12" NB pipe)
Design temperature = 675 + 25 = 7000
FS = 16500 psi
(Refer ASME B 31.3 Appendix „A‟ Table A-1)
E = 1 (Joint Quality factor. Refer ASME B31.3,
Appendix „A‟ Table A-1B)Y = 0.4 (Refer Table 304.1.1)
C = 0.125" (Specified)
Hence, considering the mill tolerance of 12.5%, the
nominal thickness for a min. thickness of 0.335" will be
t =0.335
0.875= 0.383"
In practice we will specify SCH 40 pipe which has a nominal wall
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thickness of 0.406" and minimum 0.355" (0.406x0.875).
1.7.3 THICKNESS OF BEND
ASME B31.3, in it the latest revision, has added the formula as
below for establishing the minimum thickness of bend.
The minimum thickness tm of a bend after bending, in its finished
form, shall be
Where at the intrados (inside bend radius)
PY I
SE
PDt
2
21
4
11
4
D
R
D
R
I
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And at side wall the bend centre line radius I = 1. The thicknessapply at mid span /2.
Intrados R1
Extrados
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ASME B 31.1 Power Piping Code in
clause 104.1.2 gives formula forminimum thickness as
tm = Pdo +A
2(SE +Py)
Where;
tm = Min. reqd. wall
thickness
P = Internal design Pr.
Do = Outside Dia. of Pipe
Se = Max. Allowable Stress
From Appendix „A‟.
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Y = Coefficient From Table
104.1.2.(A)
A = Additional Thickness to compensate for
1) Mat. Removed for threading
2) Corrosion and erosion
PIPE BENDS- THICKNESS OF PIPE
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As per CL 304.2.1 (102.4.5) The min. reqd. thickness of a
bend after bending shall be same as determined above.
Table 102.4.5 give min. recommended thickness
prior to bending as;
Radius of min. thk.
Bends Prior to bending
6D 1.06 tm.
5D 1.08 tm.
4D 1.14 tm.3D 1.25 tm.
31.3 Do not contain above table.
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EMPIRICAL FORMULA FOR PIPE THICKNESS
SCH. NO = 1000 PS/SS = 2000 t/d
PS = Internal working pressure psi
SS = Allowable stress psi
t = Wall thickness in inches
D = Nominal pipe size
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THICKNESS OF STRAIGHT PIPE UNDER EXTERNAL
PRESSURE
The pipe with a large ratio of diameter to wall
thickness will collapse under an external pressure which is
only a small fraction of internal pressure which it is
capable of withstanding.
To determine the wall thickness under external
pressure, the procedure outlined in the BPV Code ASME
Section VIII Div. 1 UG-28 through UG-30 shall be
followed.
Example:
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a p e:
A 6" (150 mm) NB pipe has an external Design
Pressure of 400 psig at 750
0
F. The material of construction of pipe is seamless austenitic stainless steel to
ASTM A 312 TP 304L. The corrosion allowance is nil.
Calculate thickness and select proper schedule.
Refer ASME Section VIII Div.1. UG 28
Assume value of „t‟ and determine ratios
L Do and
Do t
Do for 6" NB pipe = 6.625"
Assume SCH 5 S pipe
Nominal thickness = 0.109"
Minimum thickness considering negative mill tolerance
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of 12.5%
t = 0.875 x 0.109 = 0.095"
Consider, L
= 50
Do
Since L is unspecified
Do 6.625
= = 69.7
t 0.095From Graph (Fig. G) in ASME Section II Part D
Factor A = 0.000225
From Graph (Fig. HA-3) in ASME Section II Part D
Factor B = 2750 For the above factor A and for 7500
F
Allowable pressure Pa
4 B
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4 B
=
3 Do/ t
4 x 2750
= = 52.6 psig
3 x 69.7
This is less than the Design Pressure
Therefore, assume higher thickness.
Consider SCH 80 S pipe
Nominal thickness = 0.432"
Minimum thickness = 0.875 x 0.432
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= 0.378"
Do 6.625
= = 17.5
t 0.378
Do
Factor A for the new value of is 0.0038
t
Corresponding factor B = 5500
Allowable Pressure, Pa
4 x 5500
= 419 psig
3 x 17.5
Nominal thickness = 0.432"
Minimum thickness = 0.875 x 0.432
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= 0.378"
Do 6.625
= = 17.5
t 0.378
Do
Factor A for the new value of is 0.0038
t
Corresponding factor B = 5500
Allowable Pressure, Pa
4 x 5500
= 419 psig3 x 17.5
More than Design Pressure
Hence select SCH 80S pipe
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PIPE FITTINGS
DIMENSIONAL STANDARDS
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DIMENSIONAL STANDARDS
1. ASME B 16.1
- Cast Iron Pipe Flanges and Flanged Fittings2. ASME B 16.3
- Malleable-Iron Threaded Fittings
3. ASME B 16.4
- Grey Iron Threaded fittings4. ASME B 16.5
- Pipe Flanges and Flanged Fittings
5. ASME B 16.9
- Factory-Made Wrought Steel Butt welding
6. ASME B 16.11
- Forged Fittings, Socket welding and
Threaded
7. ASME B 16.28
- Wrought Steel Butt welding Short RadiusElbows and Returns
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8. ASME B 16.42
- Ductile Iron Pipe Flanges and FlangedFittings
9. BS 1640
- Butt weld Fittings
10. BS 3799
- Socket weld and Screwed end fittings
11. BS 2598
- Glass Pipelines and Fittings
12. IS 1239 Part-II
- M.S. Fittings13. IS 1538
- Cast Iron Fittings
14. MSS-SP-43
- Stainless Steel Fittings
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PIPE FITTINGS
CLASSIFICATION BASED ON END CONNECTIONS
SOCKET WELD/SCREWED FITTINGS
(DIMN STD ASME B16.11/BS 37 99)Classification based on the maximum cold non-shock
Working pressure.
a. 2000 # Class – only for SCRD fittings
b. 3000 # Class
c. 6000 # Class
d. 9000 # Class – only for SW fittings
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Class Type of fitting Pipe used Rating
Designation based
of fitting SCH No Wall
Designation
2000 Threaded 80 XS3000 Threaded 160 --
6000 Threaded -- XXS
3000 Socket Welding 80 XS
6000 Socket Welding 160 --9000 Socket Welding -- XXS
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For dimensional standard refer “ Codes and Standards”
B16.3 - Malleable-iron SCRD fittingsB16.4 - Grey iron the fittings
IS 1239 Pt II – MS Fittings.
SW/SCRD FITTING MATERIALS
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1 ASTM A105 - Forged Carbon Steel
2 ASTM A181 - Forged Carbon Steel for General
Purposes
3 ASTM A182 - Forged Alloy Steel and Stainless
Steel
4 ASTM A234 - Wrought Carbon Steel and
Alloy Steel pipe fittings for
moderate and elevated
temperatures5 ASTM A350 - Forged Alloy Steel for Low
Temperature Services
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BW FITTING MATERIALS
1. ASTM A 234 - Carbon Steel fittings
2. ASTM A 403 - Austenitic Stainless Steel fittings
3. ASTM A 420 - Alloy Steel for low temperature
Services
Beveled end fittings are covered under ASME B
16.9, B16-28 and BS 1640.
FLANGED END FITTING MATERIALS
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1. ASTM A 216 - Carbon Steel Castings
2. ASTM A 351 - Stainless Steel Castings
3. ASTM A 352 - Alloy Steel Castings
4. ASTM F 1545 - Plastic Lined Fittings
5. IS 1538 - CI Fittings
These fittings are covered under ASME B 16.5 and
BS 1650 for carbon and alloy steel piping and ASME
B 16.1 for cast iron fittings.
SOCKETWELD SCREWED BUTTWELD FLANGED SPIGOT/SOCKET BUTTRESS
END CONNECTIONS
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Type
ELBOWS 180o TEES CROSS CAPS REDUCERS STUBENDS COUPLINGS SWAGE NIPPLE UNIONS SPECIAL
RETURNS FITTINGS
45o 90o ELBOWS ELBOWS
SR. LR.EQUAL REDUCING
CROSS CROSS
LONG SHORT CONCENTRIC ECCENTRIC
STUBENDS STUBENDS
EQUAL REDUCING
TEES TEES
CONCENTRIC ECCENTRIC
REDUCERS REDUCERS
FULL HALF REDUCINGCOUPLINGS COUPLINGS COUPLINGS
WELDOLET SOCKOLET THREADOLET ELBOWLET SWEEPOLET NIPOLET LATROLET
FIGURE 2.1STANDARD PIPE FITTING
LR ELBOWS SR ELBOWS
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ELBOWS
45o 90o
ELBOWS ELBOWS
LR ELBOWS SR ELBOWS
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180o
RETURNS
SR. LR.
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TEES
EQUAL REDUCING
TEES TEES
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CROSS
EQUAL REDUCING
CROSS CROSS
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REDUCERS
CONCENTRIC ECCENTRIC
REDUCERS REDUCERS
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STUBENDS
LONG SHORT
STUBENDS STUBENDS
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COUPLINGS
FULL HALF REDUCING
COUPLINGS COUPLINGS COUPLINGS
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SPECIAL
FITTINGS
WELDOLET SOCKOLET THREADOLET ELBOWLET SWEEPOLET NIPOLET LATROLET
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Fig. 2.2 : Short Radius Elbow(R=1D)
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Fig. 2.4 : Elbows - 45o
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Fig. 2.5 : Elbows – Socket weld
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Fig. 2.6 : Mitre Bend 90o
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Fig. 2.7 : Mitre Bend 45o
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Fig. 2.8 : Long Radius Return
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Fig. 2.9 : Tees – Butt weld
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Fig. 2.10 : Tees – Socket weld
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Fig. 2.11 : Cross
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Fig. 2.12 : Concentric Reducer
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Fig. 2.13 : Eccentric Reducer
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Fig. 2.14 : Cap
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Fig. 2.15 : Stub End – Class A
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Fig. 2.16 : Stub End – Class B
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Fig. 2.17 : Coupling
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Fig. 2.19 : Concentric Swage Nipple
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Fig. 2.20 : Eccentric Swage Nipple
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Fig. 2.21 : Union
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Fig. 2.22: Weldolet
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Fig. 2.23:Sweepolet
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Fig. 2.24: Sockolet
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Fig. 2.25: Thredolet
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Fig. 2.26 : Latrolet
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Fig. 2.27 : Elbolet
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Fig. 3.1 : Slip-on Raised Face Flange
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Fig3.2:Socket Welded Raised Face Flange
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Fig. 3.3 : Threaded Raised Face Flange
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Fig. 3.4 : Lap Joint Flange with Stub End
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Fig.3.5:Welding Neck Raised Face Flange
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Fig.3.6 : Reducing Slip-on Flange
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Based On Pressure-temperature Rating
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The flanges are also classified by
the pressure temperature rating in ASME B 16.5
as below :
3.2.1 150 #
3.2.2 300 #3.2.3 400 #
3.2.4 600 #
3.2.5 900 #
3.2.6 1500 #3.2.7 2500 #
TABLE 2
PRESSURE – TEMPERATURE RATING FOR
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GROUPS 1.1 THROUGH 3.16 MATERIALS
TABLE 2-1.1 RATINGS FOR GROUP 1.1 MATERIALS
Nominal Forgings Casting Plaster
DesignationC-Si A 105 (1) A 216 Gr.WCB (1) A 515 Gr. 70 (1)
C-Mn-Si A350 Gr. LF2 (1) A 516 Gr.70(1)
(2)
A 537 Cl, 1 (3)
Notes:
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1) Upon prolonged exposure to temperature above
8000F, the carbide phase of steel may be converted to
graphite. Permissible, but not recommended for
prolonged use above 8000F.
2) Not to be used over 8500F.
3) Not to be used over 7000F.
WORKING PRESSURE BY CLASSICS, psig
Class
Temp., 0F 150 300 400 600 900 1500 2500
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p ,
-90 to100 285 740 990 1480 2220 8705 6170
100 260 675 900 1350 2025 3375 5625
300 230 655 875 1315 1970 3280 5470
400 200 605 845 1270 1900 3170 5280
600 140 550 730 1095 1640 2735 4560
650 140 550 730 1075 1610 2685 4440
700 110 535 710 1065 1600 2665 4440
750 95 505 670 1010 1510 2520 4200
800 80 410 550 825 1235 2060 3430
TABLE 2-1.2 RATINGS FOR GROUP 1.2 MATERIALS
Nominal Forgings Casting Plaster
Designation
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Designation
C-Mn-Si A 216 Gr.WCC (1)
A 352 Gr.LCC (2)
2 ½ Nil A 352 Gr.LC2 A 203 Gr. B (1)
3 ½ Nil A 350 Gr. LF3 A 352 Gr.LC3 A 203 Gr. E (1)
Notes:
1) Upon prolonged exposure to temperature above 8000F, thecarbide phase of steel may be converted to graphite.
Permissible,but not recommended for prolonged use above
8000F.
2) Not to be used over 6500F.
WORKING PRESSURE BY CLASSICS, psig
Class
Temp., 0F 150 300 400 600 900 1500 2500
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-20 to100 290 750 1000 1500 2250 3750 6250
200 260 750 1000 1500 2250 3750 6250
300 230 730 970 1455 2186 3640 6070
400 200 706 940 1410 2115 3630 5880
500 170 655 806 1330 1995 3325 5540
600 140 605 806 1210 1816 3035 5040
650 125 590 785 1175 1765 2940 4905
700 110 570 755 1135 1705 2840 4730
750 95 505 670 1010 1510 2520 4200
800 80 410 550 825 1235 2060 3430850 65 270 355 535 805 1340 2230
900 50 170 230 345 5a15 860 1430
950 35 105 140 205 310 515 860
1000 20 50 70 105 155 260 430
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Based On Facing
Fig. 3.8 : Flat Face
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Fig. 3.9 : Raised Face
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Fig. 3.10 : Ring Joint
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Fig. 3.11 : Tongue and Groove Joint
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Fig. 3.12 : Male / Female Joint
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Based On Material Of Construction
Flange Materials :
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Flange Materials :
3.5.1 ASTM A105 - Forged Carbon Steel
3.5.2 ASTM A181 - Forged Carbon Steel for
General Purpose
3.5.3 ASTM A182 - Forged Alloy Steel and
Stainless Steel
3.5.4 ASTM A350 - Forged Alloy Steel for low
temperature services
GASKETS
Proper selection of gasket depends upon
following factors
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following factors.
Compatibility of the gasket material with the
fluid.
Ability to withstand the pressure-temperature of
the
system.
Based on the type of construction, gaskets
are classified as:
Full Face Inside bolt circle
Spiral wound metallic
Ring type
Metal jacketed
The material which is most commonly
used is the Compressed Asbestos Fibre.
Indian Standard IS 2712 specifies three
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Indian Standard IS 2712 specifies three
different materials at three different grades. IS 2712 Gr W/1, W/2 and W/3 - for Steam, Alkali
and general applications.
IS 2712 Gr A/1 - for Acid applications.
IS 2712 Gr O/1, O/2, O/3 - for Oil applications.
Asbestos free gaskets are also available for above
applications. For very corrosive applications, PTFE
or PTFE enveloped gaskets are used.
For high temperature and high pressure applications,
spiral wound metallic gaskets are used.
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p g
ASME B 16.5 does not recommend the use
of 150# rating gaskets on flanges other than welding
neck and lapped joint type.
The spiral wound gasket will perform
when the flange face is 125-250 AARH finish.
Dimensional Standards
API 601 - Metallic Gasket for
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API 601 - Metallic Gasket for
Refinery Piping
BS 3381 - Metallic Spiral Wound
Gaskets
ASME B16.20 - Metallic Gaskets for pipe
flanges
ASME B16.21 - Non-metallic Gaskets forpipe flanges
GASKET APPLICATION
Based on Manufacturer‟s Technical Publication the
following Rule of Thumb is used for selection of Gasket
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following Rule of Thumb is used for selection of Gasket
material.
MATERIAL MAXIMUM MAXIMUM
P x T TEMP (T)
(PSI x0
F) (0
F)
Rubber Sheet 15,000 300
Woven Asb-
Rubberized Sheet 1,25,000 400
Compressed
Asbestos sheet 2,50,000 850
Metal Gasket 2,50,000 Depends on type
This Table does not imply that none of these materials
listed have ever been used above the Above the Pressure
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Temp. value shown.The designer should refer Manf. Cat. for the
recommended upper temp. limits.
The thickness normally selected by piping engineers –
2mm for rubber. 2mm for CAF. For 150 & 300 LBflanges.
The installation bolt force must seat the gasket properly
to withstand the effect of internal pressure. Bolt stress
value depend upon the material of constn. of Bolt
Flange finish could be suitable for the gasket selected.
Please find herewith given below cost comparison of
various ring gaskets used at our location. As 11/2 “size is
the most used size, it has been consider for comparison.
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Sr. Type Cost/No.
No.
1. Acid proof gasket Rs. 13.00
2. Permanite gasket Rs. 13.00
3. Ammonia gasket Rs. 10.00
4. Virgin Teflon gasket Rs. 161.00
5. Spiral wound (asb.) gasket Rs. 14.00
6. Spiral wound (grph) gasket Rs. 38.00
7. Teflon envelope gasket Rs. 110.00
Rate excludes taxes (15.3% ST and 4% octroi)
BOLTING
For low pressure, low temperature services,
machined bolts are used and studs are used otherwise.
Fl d j i t i l t th b t l
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Flanged joints using low strength carbon steel
bolts shall not be used above 200 oC or below
– 29 oC
Material Of Construction For Bolting
Bolting materials normally used are
• ASTM A 307 - Low Carbon Steel Bolting Material
• ASTM A 320 - Alloy Steel Bolting material for low
temperature service
• ASTM A 563 - Carbon and alloy steel nuts• ASTM A 193 - Alloy Steel Bolting Material for high
temperature service
• ASTM A 194 - Alloy Steel nut material for high
temperature service
• IS 1367 - Threaded steel fasteners
NON FERROUS PIPINGThe commonly used materials are:
Aluminum
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Alloy-20
Hastalloy
Lead
Monel
Nickel
Titanium
NON-FERROUS PIPING MATERIALS
1. ASTM B-241 Seamless Aluminum and Aluminum Alloy
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Pipe2. ASTM B-42 Seamless Copper Pipe
3. ASTM B-43 Seamless Red Brass Pipe
4. ASTM B-315 Seamless Copper Alloy Pipe & Tube
5. ASTM B-466 Seamless Copper Nickel Pipe & Tube
6. ASTM B-467 Welded Copper Nickel pipe7. BS-334 Chemical Lead Pipe & Fittings
8. ASTM B-161 Seamless Nickel Pipe & Tube
9. ASTM B-165 Seamless Nickel Copper Alloy (Monel) Pipe
10. ASTM B-337 Seamless & Welded Titanium and Titanium
Alloy Pipe11. ASTM B-658 Seamless & Welded Zirconium and
Zirconium Alloy Pipe.
NON-METALLIC AND LINED PIPING
The commonly used materials are PTFE,
FRB, FRV, PVC, CPVC, PP, HDPE, LDPE, UHMW HDPE,
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Glass, Cement, Ceramic, etc.
To add mechanical strength with the
corrosion properties of non-metallic materials, the concept
of lining of material is established. The combination
normally used in the industry are :
Mild Steel Rubber Lined (MSRL),
Mild Steel Glass Lined (MSGL),
Mild Steel Cement Lined,
Mild Steel PP Lined,
FRP with PP Lining,
Mild Steel PTFE lined,
Mild Steel PVDF lined
Tips for the Preparation of Piping Specification
The approach should be to minimize the number of
different elements and thus simplify and rationalize inventory.
MATERIALS
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* Carbon Steel shall be used for temperature upto 425°C
(800 °F) only.
* Low temperature steel shall be used for temperature
below -29 °C (-20 °F)
* Alloy steel shall be used for temperature above 426 °C(801 °F)
* Stainless steel shall be used for corrosive fluids.Basic
material of construction specified by Process Licenser to
be referred for the type.
* Galvanized steel piping shall be used for services
such as drinking water, instrument air, nitrogen
(LP) etc.
* Selection of Non-ferrous, Non metallic and Lined piping
shall be as per the recommendation from the ProcessLicenser.
PIPING JOINTS
* Butt welded connection shall normally be used for
all Alloy/Carbon steel piping 2" (50 mm) NB and
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larger and also for Austenitic Stainless Steel.* Alloy/Carbon steel piping 1½” (40 mm) NB and
below shall be socket welded.
* Threaded connection shall be avoided except in
galvanized piping.* Flanged joints shall be minimized as they are
points of potential leakage. It may be used to
connect piping to equipment or valves, connecting
pipe lines of dissimilar materials, where spoolpieces are required to permit removal or servicing
of equipment and where pipes and fittings are with
flanged ends.
PIPING COMPONENTS
Pipes :
* All pipe lines carrying toxic/inflammable fluids
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All pipe lines carrying toxic/inflammable fluids
shall be seamless.* Utility piping can be ERW or Seam welded.
* Steam pipe lines shall preferably be seamless.
Fittings :
oFittings shall preferably be seamless.
oButt weld fittings shall be used for pipe sizes 2”(50 mm) NB and
above for all Alloy/Carbon steel piping.
oFor stainless steel piping where thickness is less, all fittings could be
butt welding type.
oWelding tees shall be used for full size branch connections. For
reduced branch sizes upto 2 steps less than run diameter, it can be
fabricated. For smaller sizes half couplings shall be used. Full size
unreinforced branch welding can be done where pressure temperature
condition are mild.
* Welding tees shall be used for full size branch
connections. For reduced branch sizes upto 2 steps less
than run diameter, it can be fabricated. For smaller sizes
half couplings shall be used. Full size unreinforced branch
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welding can be done where pressure temperaturecondition are mild.
Flanges :
* Rating shall be based on the pressure temperature
conditions. However 150 lb flanges are not
permitted beyond 200°C (400°F).
* Socket welding flanges may be used for all pressureratings upto 1½” (40 mm) NB size except on lines
subjected to severe cyclic conditions.
* Screwed flanges shall be used for galvanized
steel/cast iron piping.
* Slip on flanges are used in 150 lb and 300 lbrating upto a maximum of 200°C. Welding neck
flanges shall be used for higher pressure ratings.
* Raised face is used for flanges upto 600 lb rating.
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For flanges 900lb rating and above RTJ isrecommended. Tongue and groove facing
shall be used selectively.
* Depending on pressure and temperature,
gasket shall be either CAF, spiral wound metallic orselected based on the corrosive nature of the fluid.
* Use flat face flanges to mate with cast iron valves
and equipment.
* Use Spiral wound gasket with inner ring for
Vacuum service