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Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
Contract No. 4405-90-2FG SPECIFICATION FOR PIPING MATERIALS Rev. B3
Proj. Area. Disc Doc. Seq. Page HEN 0000 PI SP 0001 1 of 52
SPECIFICATION FOR PIPING MATERIALS
B3 4.Mar.2014 Re-Issue as AFD H.R. Jang Ranga S.Behniafar H. Karimi
B2 04.Mar.2013 Approved For Design Suganthi Ranga ARUN
B1 24.Jan.2013 Issued for Approval Suganthi Ranga C.I.PARK
B0 29.Sep.2012 Issued for Comment W.C.KWON Balvinder C.I.PARK
Rev. Date Purpose of Issue Prep. Checked Approved Approved
ISI / Ocean Development IOOC
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
Contract No. 4405-90-2FG SPECIFICATION FOR PIPING MATERIALS Rev. B3
Proj. Area. Disc Doc. Seq. Page HEN 0000 PI SP 0001 2 of 52
INPUTS Document Number Title Status
HEN-0000-PI-DB-0001 HEN-0000-MW-BD-0001 HEN-0000-MW-SP-0001
Piping Design Criteria Material Selection Diagram Material Selection and Corrosion Management Specification and Report
B1
B2
B3
REVISONS & HOLDS
Revision Description of Changes & Holds B3
Per latest Material Selection report, PMS is revised accordingly. (Sec. 9,10 and Annexure I)
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
Contract No. 4405-90-2FG SPECIFICATION FOR PIPING MATERIALS Rev. B3
Proj. Area. Disc Doc. Seq. Page HEN 0000 PI SP 0001 3 of 52
TABULATION OF REVISED PAGES
Sheet Revisions Sheet Revisions B0 B1 B2 B3 B0 B1 B2 B3
1 X X 36 X X 2 X X 37 X X 3 X X 38 X X 4 X X 39 X X 5 X X 40 X X 6 X X 41 X X 7 X X 42 X X 8 X X 43 X X 9 X X 44 X X 10 X X 45 X X 11 X X 46 X X 12 X X 47 X X 13 X X 48 X X 14 X X 49 X X 15 X X 50 X X 16 X X 51 X X 17 X X 52 X X 18 X X 53 X 19 X X 54 X 20 X X 55 X 21 X X 56 X 22 X X 57 X X 23 X X 58 X X 24 X X 59 X X 25 X X 60 X X 26 X X 61 X X 27 X X 62 X X 28 X X 63 X X 29 X X 64 X X 30 X X 65 X X 31 X X 66 X X 32 X X 67 X X 33 X X 68 X X 34 X X 69 X X 35 X X 70 X X
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
Contract No. 4405-90-2FG SPECIFICATION FOR PIPING MATERIALS Rev. B3
Proj. Area. Disc Doc. Seq. Page HEN 0000 PI SP 0001 4 of 52
Sheet Revisions Sheet Revisions B0 B1 B2 B3 B0 B1 B2 B3
71 X X 72 X X 73 X X 74 X X 75 X X 76 X X 77 X X 78 X X 79 X 80 X 81 X 82 X 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
Contract No. 4405-90-2FG SPECIFICATION FOR PIPING MATERIALS Rev. B3
Proj. Area. Disc Doc. Seq. Page HEN 0000 PI SP 0001 5 of 52
Table of Contents
1. GENERAL ................................................................................................6
1.1 Introduction .........................................................................................7
1.2 Definition ............................................................................................7
1.3 Scope Item Included ...............................................................................7
1.4 Applicable Codes, Standards and Specifications ............................................8
1.5 Order of Precedence ............................................................................ 12
1.6 Abbreviations ..................................................................................... 13
2. DESIGN MANUFACTURE ............................................................................ 15
2.1 General ............................................................................................ 15
2.2 Design ............................................................................................. 15
2.3 Material ............................................................................................ 17
2.4 Piping Component Manufacture............................................................... 28
2.5 Fabrication ........................................................................................ 35
3. INSPECTION AND TESTING ........................................................................ 36
3.1 Pressure Testing ................................................................................. 36
3.2 Examination ....................................................................................... 36
3.3 Testing ............................................................................................. 37
4. IDENTIFICATION AND TAGGING ................................................................... 39
4.1 Marking ............................................................................................ 39
4.2 Color Coding ...................................................................................... 41
4.3 Color Marking Schedule ........................................................................ 42
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
Contract No. 4405-90-2FG SPECIFICATION FOR PIPING MATERIALS Rev. B3
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5. PREPARATION FOR SHIPMENT ................................................................... 43
6. PROTECTION AGAINST CORROSION AND MECHANICAL DAMAGE ....................... 44
7. DOCUMENTS SUBMITTALS ........................................................................ 45
7.1 Certificate of Compliance ....................................................................... 45
7.2 Material Test Reports ........................................................................... 45
7.3 Welding and NDE Procedures ................................................................. 46
7.4 Supply of Calculation and Drawings ......................................................... 47
8. QUALITY ASSURANCE .............................................................................. 47
8.1 Inspection Authorization ....................................................................... 47
8.2 Refurbishment .................................................................................... 48
8.3 Authorization ..................................................................................... 48
9. PIPING CLASS DESIGNATION ..................................................................... 49
10. PIPING CLASS SERVICE INDEX ................................................................... 50
Annexure I : PIPE CLASS & BRANCH TABLE
1. GENERAL The Hengam Field is located in the Persian Gulf at approximately 45 km south of Qeshm
Island. Iranian Offshore Oil Company (IOOC) has awarded HENGAM offshore development
EPCI project to Intelligent Solutions Inc. and Ocean development LLC. Joint Venture to
perform Basic & Detailed Engineering, as well as procurement, fabrication, installation, pre-
commissioning & commissioning for:
Topside facilities of three offshore wellhead platforms
Infield pipe lines
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
Contract No. 4405-90-2FG SPECIFICATION FOR PIPING MATERIALS Rev. B3
Proj. Area. Disc Doc. Seq. Page HEN 0000 PI SP 0001 7 of 52
Submarine composite Cable (Power, Control, Fiber optic) from offshore to onshore
facilities.
1.1 Introduction Refer to scope of work.
1.2 Definition For the purpose of this specification, the following definitions shall hold:
COMPANY IOOC (also referred to as the PRINCIPAL) or any duty appointed party authorized to act for, and on its behalf.
CONTRACTOR A party to a contract with IOOC (PRINCIPAL) that is responsible for the supply of all or part of any facilities, product or service to perform the
duties specified by IOOC (PRINCIPAL).
IOOC (PRINCIPAL) may undertake all or part of the duties of the
CONTRACTOR
SELLER A party to purchase order with IOOC that is responsible for the supply of all or part of any facilities, product or service to perform the duties
specified by IOOC. IOOC may under take all or part of the duties of the
SELLER.
SHALL Indicates a requirement. SHOULD Indicates a recommendation.
1.3 Scope Item Included This specification covers minimum technical requirements for pipe and piping components to
be used for the Hengam Field to be installed on Hengam Offshore Development Project
Phases WHP1, WHP2 and WHP3 Offshore Platforms.
This specification in conjunction with relevant International codes and standards, other
referenced General Specification and related documents determine the overall technical
requirement for design, materials, manufacture, marking, inspection & testing, packing &
shipment of piping materials.
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
Contract No. 4405-90-2FG SPECIFICATION FOR PIPING MATERIALS Rev. B3
Proj. Area. Disc Doc. Seq. Page HEN 0000 PI SP 0001 8 of 52
Where no exceptions are not indicated, the Supplier's quotation for the supply will be
interpreted as being in full compliance.
Item Excluded - All heating, ventilation, domestic water and sewage services
- Subsea pipework, pipelines, risers, etc.
- Special Piping Items (SPs) (Unless referring to this specification)
- Instrument tubing and fittings
- Installation of pipe, fittings, or flanges is not included in Supplier's scope under this
specification.
1.4 Applicable Codes, Standards and Specifications All piping components, systems and design shall, as a minimum, meet the requirements of the
latest edition of the National and International codes and standards listed below. Should any
requirements be in conflict, the more stringent requirements shall apply.
ASME B31.3 Process Piping
ASME B31.4 Pipe-Line Transportation System for Hydro Carbon and Other Liquids
ASME B31.8 Gas Transmission & Distribution Piping Systems
ASME B1.1 Unified Inch Screw Threads
ASME B1.20.1 Pipe Threads, General Purpose (Inch)
ASME B16.1 Cast Iron Pipe Flanges and Flanged Fittings Classes 25, 125 and 250
ASME B16.11 Forged Fittings, Socket-Welding and Threaded
ASME B16.5 Pipe Flanges and Flanged Fittings
ASME B16.20 Metallic Gaskets for Pipe Flanges
ASME B16.21 Non Metallic Flat Gaskets for Pipe Flanges
ASME B16.25 Butt-Welding Ends
ASME B16.36 Orifice Flanges
ASME B16.47 Large Diameter Steel Flanges (NPS 26 through NPS 60)
ASME B16.48 Steel Line Blanks
ASME B46.1 Surface Texture
ASME B16.9 Factory-made Wrought Steel Butt welding Fittings
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
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ASME B36.10 Welded and Seamless Wrought Steel Pipe
ASME B36.19 Stainless Steel Pipe
ASME B46.1 Surface Texture
ASME Section II Boiler and Pressure Vessel Code Ferrous Material Specifications
ASME Section V Boiler and Pressure Vessel Code - Non Destructive Examination
ASME Section VIII
Division I
Boiler and Pressure Vessel Code - Pressure Vessel
ASME IX Welding and Brazing Qualifications
ASME Section X Boiler and Pressure Vessel Code - Welding and Brazing
Qualification
API 590 Line Steel Blanks - Dimensional Standard (Withdrawn and replaced
by ASME B16.48)
API 5L Specification for Line Pipe
ASTM Standard-
Section 1
Volume 01.02 Ferrous Castings; Ferroalloys
ASTM 105/A105M Standard Specification for Carbon Steel Forgings for Piping
Applications
ASTM A106 Standard Specification for Seamless Carbon Steel Pipe for High-
Temperature Service
ASTM A153/A153M Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel
Hardware
ASTM A182/A182M Standard Specification for Forged or Rolled Alloy-Steel Pipe Flanges,
Forged Fittings, and Valves and Parts for High- Temperature Service
ASTM A193/A193M Standard Specification for Alloy-Steel and Stainless Steel
Bolting Materials for High-Temperature Service
ASTM 194/A194M Standard Specification for Carbon and Alloy Steel Nuts for Bolts for
High Pressure or High Temperature Service, or both
ASTM A216/A216M Standard Specification for Steel Casting, Carbon, Suitable for Fusion
Welding, for High Temperature Service
ASTM A234/A234M Standard Specification for Piping Fittings of Wrought Carbon Steel
and Alloy Steel for Moderate and High Temperature Service
ASTM A240/A240M Standard Specification for Chromium and Chromium-Nickel Stainless
Hengam Offshore Development Project EPCI For
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Contract No. 4405-90-2FG SPECIFICATION FOR PIPING MATERIALS Rev. B3
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Steel Plate, Sheet, and Strip for Pressure Vessels and for General
Applications.
ASTM A312/A312M Standard Specification for Seamless and Welded Austenitic
Stainless Steel Pipes
ASTM A333/A333M Standard Specification for Seamless and Welded Steel Pipe for Low-
Temperature Service
ASTM A350/A350M Standard Specification for Carbon and Low-Alloy Steel Forgings,
Requiring Notch Toughness Testing for Piping Components
ASTM A351/A351M Standard Specification for Casting, Austenitic, Austenitic-Ferritic
(Duplex) for Pressure-Containing Parts.
ASTM A352/A352M Standard Specification for Casting, Ferritic and Martensitic, for
Pressure-Containing Parts, Suitable for Low- Temperature Service.
ASTM A358/A358M Standard Specification for Electric-Fusion-Welded Austenitic
Chromium-Nickel Alloy Steel Pipe for High- Temperature Service
ASTM A403/A403M Standard Specification for Wrought Austenitic Stainless Steel Piping
Fittings
ASTM A420/A420M Standard Specification for Piping Fittings of Wrought Carbon Steel
and Alloy Steel for Low-Temperature Service
ASTM A488/A488M Standard Practice for Steel Castings, Qualifications of Procedures
and Personnel
ASTM A516/A516M Standard Specification for Pressure Vessel Plates, Carbon Steel, for
Moderate and Lower Temperature Service.
ASTM A530 Standard Specification for General Requirements for Specialized
Carbon and Alloy Steel Pipe
ASTM A671/A671M Standard Specification for Electric-Fusion-Welded Steel Pipe for
Atmospheric and Lower Temperatures
ASTM A694/A694M Standard Specification for Carbon and Alloy Steel Forgings for Pipe
Flanges, Fittings, Valves, and Parts for High- Pressure Transmission
Service
ASTM A790/A790M Standard Specification for Seamless and Welded Ferritic/Austenitic
Stainless Steel Pipe
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
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ASTM A860/A860M Standard Specification for Wrought High-Strength Low Alloy Steel
Butt-welding Fittings
ASTM A123/A123M Standard Specification for zinc (Hot-dip Galvanized) on Iron and Steel
Products
ASTM A153/A153M Standard Specification for zinc Coating (Hot-Dip) on Iron and Steel
Hardware
ASTM B366 Standard Specification for Factory-Made Wrought Nickel and Nickel
Alloy Fittings
ASTM B444 Standard Specification for Nickel-Chromium-Molybdenum-
Columbium Alloys (UNS N06625) and Nickel-Chromium-
Molybdenum-Silicon Alloy (UNS N06219) Pipe and Tube
ASTM B564 Standard Specification for Nickel Alloy Forgings
ASTM D2310 Standard Classification for Machine-made Reinforced Thermosetting
Resin Pipe
ASTM D2992 Method for Obtaining Hydrostatic Design Basis for Reinforced
Thermosetting Resin Pipe and Fittings
ASTM E94 Recommended Practice for Radiographic Testing.
ASTM E165 Recommended Practice for Liquid Penetrate inspection.
BS 3799 Steel Pipe Fittings Screwed and Socket weld for the Petroleum
Industry
ASNT-SNT-TC-1A Recommended Practice for Nondestructive Testing Personnel
Qualification and Certification
ISO 4427 Polyethylene (PE) Pipes for Water Supply Specification
ISO 14692 Glass Reinforced Plastic (GRP) Piping
NACE MR0175/
ISO 15156
Petroleum and Natural Gas Industries-Materials for use in H2S
containing Environments in Oil and Gas Production
MSS SP-6 Standard Finishes for Contact Faces of Pipe Flanges and Connecting
- End Flanges of Valves and Fittings
MSS SP-9 Spot Facing for Bronze, Iron and Steel Flanges
MSS SP-25 Standard Marking System for Valves, Fittings, Flanges and Unions
MSS SP-43 Wrought Stainless Steel Butt Welding Fittings
MSS SP-44 Steel Pipe Line Flanges
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
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MSS SP-53 Quality Standard for Steel Castings and Forging for Valves, Flanges,
Fittings, and Other Piping Components - Magnetic Particle
Examination Method
MSS SP-54 Quality Standard for Steel Castings for Valves, Flanges, Fittings, and
Other Piping Components - Radiographic Examination Method
MSS SP-55 Quality Standard for Steel Castings for Valves, Flanges, Fittings, and
Other Piping Components -Visual Method
MSS SP-75 High Test Wrought Butt Welding Fittings
MSS SP-79 Socket Welding Reducer Inserts
MSS SP-83 Steel Pipe Unions, Socket Welding and Threaded
MSS SP-93 Quality Standard for Steel Castings for Valves, Flanges, Fittings, and
Other Piping Components - Liquid Penetrant Examination Method
MSS SP-94 Quality Standard for Steel Castings for Valves, Flanges, Fittings, and
Other Piping Components - Ultrasonic Examination Method
MSS SP-95 Swage(d) Nipples and Bull Plugs
MSS SP-97 Forged Carbon Steel Branch Outlet Fittings-Socket Welding,
Threaded and Butt welding ends
BS EN 10204 Metallic Products- Type of Inspection Documents
EEMUA 144 90/10 Copper Nickel Alloy Piping for Offshore Applications - Tubes
Seamless and Welded
EEMUA 145 90/10 Copper Nickel Alloy Piping for Offshore Applications - Flanges
Composite and Solid
EEMUA 146 90/10 Copper Nickel Alloy Piping for Offshore Applications - Fittings
1.5 Order of Precedence In case of conflict between this specification, other referenced specifications and the above
Codes and Standards; the conflict shall be brought to the Purchaser I Company's attention for
resolution and approval in writing. In all cases, the most stringent requirements shall apply.
Should any conflict occur as a result of complying with the data sheets and specifications, the
order of precedence shall be as follows:
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
Contract No. 4405-90-2FG SPECIFICATION FOR PIPING MATERIALS Rev. B3
Proj. Area. Disc Doc. Seq. Page HEN 0000 PI SP 0001 13 of 52
- Design Basis
- Piping & Instrumentation Diagrams
- Data Sheet
- General Layouts
- Project Specifications
- General Specifications
- Applicable Codes & Standards
- Dedicated Software's
- Specific Studies and schematic Diagrams
All deviations from the requirements of this Specification, its Attachments and the referenced
Codes and Standards shall be advised to the Purchaser I Company. In the absence of such a
statement full compliance will be assumed.
1.6 Abbreviations
AISI American Iron and Steel Institute
API American Petroleum Institute
ASME American Society of Mechanical Engineers
ASTM American Society for Testing and Materials
BS British Standard
BSI British Standards Institute
Degrees Celsius
Degrees Fahrenheit
C Carbon
CE Carbon Equivalent
Cr Chromium
CRA Corrosion Resistant Alloy
CS Carbon Steel
Cu Copper/Cupro
D Diameter
DPI Dye Penetrant Inspection
EN Euro Norm
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
Contract No. 4405-90-2FG SPECIFICATION FOR PIPING MATERIALS Rev. B3
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ERW Electro Resistance Weld
Fe Iron
HIB Hardness Brinell
HIC Hydrogen Induced Cracking
HYCS High Yield Carbon Steel
INS Inches
LTCS Low Temperature Carbon Steel
MAX Maximum
MIN Minimum
m Meter
mm Millimeter
Mn Manganese
Mo Molybdenum
MPI Magnetic Particle Inspection
MR Material Requirement
MSS Manufacturers Standardization Society
N Newtons
NB Nominal Bore
NDE Non-Destructive Examination
Ni Nickel
NPS Nominal Pipe Size
NPT American National Standard Taper Pipe Thread
Nm Newton Meters
PMI Positive Material Identification
PPM Parts Per Million
PREN Pitting Resistance Equivalent Number
Ra Surface Roughness
RP Recommended Practice
SAW Submerged Arc Weld
V Vanadium
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
Contract No. 4405-90-2FG SPECIFICATION FOR PIPING MATERIALS Rev. B3
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2. DESIGN MANUFACTURE
2.1 General The Supplier shall advise the Purchaser at the bid stage of all intended sources of material
supply and proposed sub-contractors. All items shall be supplied in accordance with the
specifications stated in this document and the appropriate National Standards.
Materials for pipes, fittings and flanges shall be as stated in the relevant material requisition.
Materials shall meet the requirements detailed in this specification and in the product
specification as stated in the material requisition. All materials shall be new, clean and free
from rust, mill scale, pits and defects.
Weld repair of seam welded pipe and fittings is only permitted on the seam welds.
Weld repair of wrought or forged material will not be permitted. Cast materials shall only be
repaired subject to prior written approval by the Purchaser I Company.
Where a Supplier wishes to supply a suitable alternative to that specified, he shall submit the
relevant specification of the alternative to the Purchaser I Company for approval at the bid
stage.
Threads shall conform to ASME B1.20.1 taper.
Material manufactured from bar-stock is not acceptable.
2.2 Design End Preparation End of pipe, fittings, and flanges shall be in accordance with the following:
- Pipe 1-1/2" and smaller may be furnished with plain ends, and cut square.
- Pipe 2" and larger and butt weld end fittings and flanges shall be furnished with beveled
end in accordance with ASME B16.25, Figures 2a or 3a. Flame cut weld bevels Socket
weld ends of fittings and flanges shall be in accordance with ASME B16.11.
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
Contract No. 4405-90-2FG SPECIFICATION FOR PIPING MATERIALS Rev. B3
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- Threaded ends of pipe, fittings, and flanges shall be taper pipe threads (NPT) in
accordance with ASME B1.20.1.
Hardness of Pipe Except for wrought pipe fitting in accordance with ASTM A234 Gr. WPB and WPC and
forgings in accordance with ASTM A105, all Carbon Steel and High Yield Carbon Steel
internally clad with corrosion resistant alloy (CRA) material, i.e. Alloy 625 UNS N06625, piping
shall be supplied with a maximum hardness of 248 HV 10 (22 HRC) in compliance with ISO
15156-2 wherever Sour Service or ISO 15156 is specified.
The maximum hardness for Pipeline High Yield Carbon Steel (HYCS) piping components, i.e.
API 5L Gr X60, ASTM A860, ASTM A694, etc. shall be in accordance with Piping Design
Criteria, Doc No. HEN-0000-PI-DB-0001.
The maximum hardness of the base metal, weld seam, and heat affected zone, after required
heat treatment, shall not exceed the requirement of the material supply specification
referenced for manufacture.
Galvanizing Pipe, fittings, and flanges specified in the Item Code Purchased Description as galvanized,
shall be hot-dip galvanized in accordance with ASTM A53 or ASTM A153, as applicable.
Galvanized pipe up to 1 shall be supplied in double random lengths, threaded both end and
with a hand tightened pipe coupling fitted to one end.
Galvanized pipe and coupling shall be supplied with threads free of galvanizing.
ISO Wherever Sour Service or ISO 15156 is specified, all piping materials shall comply with ISO
15156
In addition the maximum sulfur content on Carbon, Low Alloy and High Yield Carbon Steel
material shall be as follows:
- Flat rolled: 0.003%
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
Contract No. 4405-90-2FG SPECIFICATION FOR PIPING MATERIALS Rev. B3
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- Seamless: 0.01%
- Forging: 0.025%
2.3 Material
2.3.1 Carbon Low Alloy Steels and High Yield Carbon Steel (H.Y.C.S.) - The steel used for the manufacture of carbon steel pipe, fitting, flanges and bolting shall
be produced by either an electric furnace or by the basic oxygen process.
- API 5L Grade X60 Seamless pipe shall not be cold expanded, and shall be supplied to
API-5L Product Specification Level 2 (PSL2)
- API 5L Grade X60 SAW pipe shall be 100% radiography and supplied to API-5L Product
Specification Level 2 (PSL2).
- Low temperature carbon steel materials to ASTM A350 LF2 CL.1 shall be supplied as
Class 1 (Impact Tested at -46 deg C). The acceptance criteria energy values for ASTM
A350 LF6 CL.3 and ASTM A420 WPL6 shall be accordance with Section 3.3.2.2 - Impact
Testing.
- All Carbon and Carbon-Manganese steel (except High Yield Strength Carbon steels) shall
meet the
Following weight percent limits by ladle analysis:
Carbon Content for Carbon Steel:
Pipe & fittings 0.23% (Max)
Casting & forging 0.23% (Max)
Carbon Equivalent(CE) Shall be less than 0.42 (ladle analysis)
Where CE = C + Mn/6 + (Cr + Mo + V)/5 + (Cu + Ni)/15
If the content of alloying elements other than C or Mn is unknown, the formula to be used shall
be
CE = C + Mn/6 and, in this case, the carbon equivalent shall be less than 0.40 (ladle analysis).
2.3.2 Substitution of Equivalent Materials In general, carbon steel pipes for which grade B is specified shall in no case be replaced by
grade A pipes. Substitution with ERW pipe, where SAW pipe is specified, is prohibited.
However, some other substitutions of materials may be accepted:
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
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- Substitutions acceptable without prior approval by the Purchaser.
Carbon steel pipes to API 5L Grade B may be replaced with carbon steel pipes to
ASTM A106 Grade B.
- Possible substitutions requiring prior approval by the Purchaser I Company.
Stainless steel pipes to ASTM A312, welded by electric fusion (SAW) may be replaced
with welded stainless steel pipes to ASTM A358 CL.3 and vice-versa, subject to prior
approval by the Purchaser I Company.
2.3.3 Hydrogen Induced Cracking (HIC) Test Requirement The material shall be tested at a frequency of one set of tests per heat of material in
accordance with the NACE Standard TM0284 using the sulfide stress corrosion cracking test
solution defined in NACE Standard TM0177. The test coupons shall be sectioned in
accordance with NACE TM0284. The acceptance criteria shall be:
Crack Length Ratio (CLR) 15%
Crack Thickness Ratio (CTR) 5%
Crack Surface Ratio (CSR) 1.5%
No Individual Crack Length > 5mm
Pipe and plate which is internally clad with corrosion resistant alloy (CRA) shall be guaranteed
by vendor, otherwise HIC test of base metal is required as per ISO 15156
2.3.4 Heat Treatment All carbon steel (impact tested and non-impact tested) shall be supplied in the normalized or
normalized and tempered heat-treated condition where the minimum tempering temperature
shall be 1184F (640C) with the following exceptions:
- Hot finished pipe to ASTM A106
- Where it becomes necessary to quench and temper material to achieve the specified
mechanical properties. In such instances the preferred minimum tempering temperature
shall be 650C
Hengam Offshore Development Project EPCI For
Topsides and Infield Pipelines and Subsea Cables
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- High yield carbon steel grades X60 and above shall be manufactured with thermo
mechanical controlled process (TMCP). In this case no additional tempering shall be
utilized, else mechanical properties will decline.
The Supplier shall provide full details of all heat treatments proposed at the bid stage
2.3.5 Impact Testing
Where Charpy impact tests are required by the product specification or specified in the
material requisition and ASME B31.3, the test temperature shall be at the product specification
test temperature or the minimum design temperature, whichever is the more stringent, or as
specified in the material requisition.
Longitudinal samples shall only be used by prior agreement with the Purchaser. Charpy
acceptance values for longitudinal samples shall be agreed with the Purchaser.
Specific Charpy Impact Energy Values shall be as follows for full size material specimens:
ASTM A333 Grade 6, ASTM A671 Gr. CC65 CL32, ASTM A420 WPL6, ASTM A350 LF6 CL.3
27 joules min. average
20 joules min. Individual
Test Temperature -50(-46)
ASTM A860 WPHY 65, MSS SP-75, ASTM A694-F65
42 joules min. average
35 joules min. Individual
Test Temperature -20(-29)
For HYCS to API 5L X60, the average impact energy of 3 samples in the transverse direction
and the minimum design temperature, Tmin. Shall be as follows:
API 5L X60
73 joules min. average
55 joules min. Individual
Test Temperature -20(-29)
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Sub-size specimens are only acceptable where full size specimens (10mm x 10 mm) cannot
be extracted. The largest possible sub-size specimen shall be taken. Adjusted acceptance
criteria for sub-size transverse specimens shall be not less than the following:
10mm x 7.5mm 80% of the full size value
10mm x 5mm 70% of the full size value
10mm x 2.5mm 40% of the full size value
2.3.6 Impact Testing on Welded Items Where welding is involved in manufacture, welding procedure qualification impact tests shall
be performed where impact testing of the parent material is required or where high strength
materials are used.
The test method shall be as per ASTM E23 or BS EN 10045-1.
The acceptance criteria and test temperature shall be as for transverse samples of parent
material.
On welded pipe, additional impact tests shall be performed on coupons from welding
procedure qualification tests. The number of specimens shall be as below in Table 1. Where
the thickness at the weld exceeds 25mm a further set of 3 specimens shall be taken with the
notch at the root of the weld. Specimens shall be etched in order to accurately locate the
Charpy V-notch.
Table 1 - Impact Testing for Welded Pipe
TEST REQUIREMENT
NUMBER
Charpy Testing of Weld Metal
3 off
Fusion Line
3 off
Fusion Line + 2mm
3 off
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Fusion Line + 5mm
3 off
Where the carbon content is limited the actual tensile strength of the steel should not exceed
the minimum required by the relevant specification by more than 130 MPa (18,850 psi).
2.3.7 Austenitic Stainless Steels Manufacturing of the 300 series austenitic stainless steel shall be to ASTM A312, A351 and
A403. Grade 316/316L stainless steel shall be dual certified, i.e. chemical composition to
Grade 316L SS and mechanical strength to Grade 316 SS.
All material shall be supplied in the fully solution annealed heat-treated condition and free of
subsequent cold work. Welded items shall be solution annealed after welding. If welding
repairs are required to the bodies of cast (A351) items in 316 stainless steel, the procedure
shall be subject to approval.
Welded pipe shall be made by a continuous automatic electric fusion welding process to the
requirements of ASTM A358 CL.3. The composition of all filler metals shall be chosen such
that the resistance to corrosion and other properties of the weld deposited weld metal shall
have a ferrite content of between 3% and 10%. No weld repairs shall be permitted without
prior COMPANY's approval.
Welded 316/316L SS pipe shall be ASTM A358 CL.3 Grade 316/316L.
Longitudinally seam welded (with the mandatory use of weld filler metal) shall be supplied in
the fully solution annealed condition.
Welding shall be by use of qualified welders and approved welding procedures and welding
procedure qualification records, in accordance with ASME IX. PQRs of welded fittings. The
deposited filler metal should provide a minimum ferrite content of 3%.
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Welded 316/316L SS fittings shall be 100% radiographed to ASME V Art. 2 and acceptance
criteria to ASME VIII Div. 1 UW51.
Welded 316/316LSS fittings shall be ASTM A403 Grade WP316/316L Class WX.
100% DPI shall be performed on all 316/316LSS materials.
100% Positive Material Identification (PMI) shall be performed on austenitic stainless steel
material.
AII 316SS grade material certified to IS015156 shall have a maximum hardness of248 HV10.
In order to use austenitic stainless steel at low temperature, weld metal deposits and heat
affected zone
Shall be impact tested as required by ASME B31.3 par. 323.2.2 and 323.3
All SS grade material shall be annealed, quenched & normalized.
All items/parts shall be supplied in solution annealed condition. For all Austenitic Stainless
steels, Inter granular Corrosion (IGC) Test shall be conducted as per following:
ASTM A262 Practice 'B' with acceptance criteria of 60 mils/year (max.) for casting.
ASTM A262 Practice 'E' with acceptance criteria of 'No cracks as observed from 20X
magnification' & microscopic structure to be observed from 250 X magnification for other than
casting.
For IGC test, two sets shall be drawn from each solution annealing lot; one set corresponding
to highest carbon content and other set corresponding to the highest rating/thickness.
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For all items of stabilized SS grades, stabilizing heat treatment shall also be done. It shall be
carried out subsequent to normal solution annealing. Soaking temperature and holding time
shall be 4hrs and 900 deg C respectively.
2.3.8 Duplex Stainless Steel This section defines the minimum requirements for Duplex stainless steel materials.
Material shall conform to the mechanical properties and the chemical composition of the
relevant ASTM standard as defined in ASME B31.3.
UNS S31803 shall be used as the basis of this material.
The chemical composition shall meet the requirements of the relevant ASTM standard for the
relevant grade of material. A product analysis shall be conducted in accordance with the
relevant ASTM standard (e.g. ASTM A182). The maximum carbon content shall be 0.03%
maximum by ladle and product check analysis. Minimum nitrogen content shall be 0.15%.
Duplex stainless steel fittings shall be seamless up to 8" NB and longitudinally seam welded
at 10" NB and larger (with the mandatory use of weld filler metal) and shall be supplied in the
fully solution annealed and water quenched condition. Welding shall be by use of qualified
welders, approved welding procedures and welding procedure qualification records in
accordance with ASME IX. PQRs of welded fittings.
Welded Duplex stainless steel fittings shall be 100% radiographed to ASME V Art 2 and
acceptance criteria to ASME VIII Div.1 UW51.
Welded Duplex stainless steel fittings shall have a ferrite content of 40-60% for the base
material and 25-60% for welds, determined by a metallographic method in accordance with
ASTM E562.
Charpy impact energy values shall be as follows for full size specimens:
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UNX S31803
45 joules min. average
32 joules min. Individual
Test Temperature -60(-51)
The steel shall be made by electric arc and/or electric induction furnace process. Refining by
the Argon Oxygen Decarburization (AOD) or the Vacuum Oxygen Decarburization (VOD) or
similar is required.
The minimum PREN based on product analysis shall be 33 for 22% Cr duplex stainless steel.
PREN is defined as:
PREN = %wt Cr = (3.3 x %wt Mo) = (16 x %wt N)
100% PMI shall be performed on all Duplex Stainless Steel material.
Duplex stainless steel pipe and fittings shall be supplied in the fully solution annealed and
quenched condition.
2.3.9 High Nickel Alloy Solid Nickel Alloy 625 UNS N06625
All Solid Nickel Alloy 625 UNS N06625 shall be supplied in accordance with:
Pipe ASTM B444
Plate ASTM B443
Fitting ASTM B366
Flanges & forging ASTM B564
All deposited weld metal shall be Alloy 625 UNS N06625 only.
Welded pipe shall be supplied in the solution annealed and descaled condition and free of
subsequent cold work.
All Alloy 625 UNS N06625 shall be supplied with the following minimum mechanical properties:
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Tensile Strength 827 MPa (120,000 psi)
Yield Strength 414 MPa (60,000 psi)
Elongation in 50mm 30%
Low Temp High Yield Carbon Steel with Alloy 625 UNS N06625 Weld Overlay
Fabrication by welding of Alloy 625 UNS N06625 overlaid on Low Temp HYCS piping
component shall comply with clause 323.4.3 (d) of ASME B31.3 Code and supplementary
requirement below
Additional Requirements for Alloy 625 UNS N06625 Clad Pipe and Fittings
a. All cladding material shall conform to Alloy 625 UNS N06625. The minimum cladding
thickness for all pipes and fitting shall be 3mm
b. All substrate materials for clad pipe, fittings and flanges shall be High Yield Strength Carbon
Steel (HYCS) to minimum yield strength of 65ksi. Seamless carbon steel pipe shall meet
the requirements of API 5L X60. Fittings shall meet the requirements of MSS SP75 WPHY
60. Flanges shall meet the requirements of ASTM A694 GR F60.
c. All dimensions for clad pipe shall be to API 5L. All dimensions for clad fittings shall be to
ASME B16.9. All dimensions for clad flanges shall be to ASME B16.5.
d. Clad pipe shall meet the requirements of API 5LD metallurgical bonded seamless pipe
unless otherwise specified. 20"NB API 5L X60 pipe for cladding is acceptable as SAW with
100% radiographic examination.
e. HYCS Clad Alloy 625 UNS N06625 pipe & fittings shall conform to ASME B31.3
para.323.4.3 (b) integrally clad, and ASTM A265/B444 bond strength tested, or equivalent.
f. Supplier shall provide full details of the pipe, fitting and flange manufacturing process,
including details of all welding, heat treatment, testing and inspection at the bid stage.
g. Clad fittings shall be seamless and may be made by one of the following processes
depending on the type, size and geometry of the fitting:
- From clad pipe by the hot or cold forming process.
- By weld overlaying.
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- Where fittings cannot be manufactured from these two processes, other processes may
be proposed by the Vendor for consideration by the Purchaser. Otherwise the fittings
shall be solid Alloy 625 UNS N06625
h. Where CRA-clad pipe, fittings and flanges are fabricated by weld overlaying; the Welding
Procedure Specification (WPS) shall be approved by Company before welding is started.
Welding procedure for each welding process shall be qualified in accordance with ASME IX
or EN 15607. Design of clad fittings shall be in accordance with accepted standards and
manufacture shall generally be in accordance with the provisions of the high yield carbon
steel fitting standards.
i. Where weld overlaying with Alloy 625 UNS N06625 is used, preference shall be given to the
use of two layers of welding deposit to the minimum thickness of 3mm, in order to minimize
dilution of the 625 with iron at the surfaces in contact with the process fluids. A single layer
deposit may be used providing that the iron level in the Alloy 625 UNS N06625 surface in
contact with the process is less than 7% after dilution has occurred. If this iron level is
exceeded, the minimum chromium content shall be 20% and the minimum molybdenum
level shall be 8%, otherwise 2 layers of welding shall be used.
j. Where necessary, a post weld heat treatment shall be employed after weld overlaying if the
hardness of the backing steel exceeds the limits specified on section 2.2.2
k. Welding specifications, welder qualifications and welder experience must be suitable for
Alloy 625 UNS N06625 clad materials.
I. All seams shall be 100% radiographed in accordance with ASME VIII Division I. All weld
overlaid surfaces shall be 100% dye Penetrant tested in accordance with ASME V, with no
indications acceptable.
m. All Alloy 625 UNS N06625 clad pipe, fitting and flange are to be used in low temperature
service, the mechanical properties of the backing steel must meet the low temperature limit
for the intended service application and complied with impact testing. For Alloy 625 UNS
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N06625 clad HYCS X65 steel, the clad material shall be tested in accordance with the
requirements for the backing steel. The as-deposited weld yield strength of the Alloy 625
UNS N06625 filler material shall meet the requirements of the HYCS X65 backing steel.
n. The cladding material must be resistant to corrosion and cracking in the service
environment and any heat treatment required for manufacturing or code compliance
purposes must not cause sensitization, segregation or third-phase formation in the CRA that
could reduce its corrosion resistance.
2.3.10 Copper-Nickel Material (Cu-Ni) Seamless and welded pipe shall comply with the requirements of EEMUA 144 for 90/10
copper nickel alloy piping. Pipe shall include supplementary requirements of 1.7.2(a)(b)(c) and
1.9.1. Pipe shall be seamless up to and including 6. NB. Copper Nickel pipe shall be cut by
mechanical means. Minimum random lengths for all Copper Nickel pipe shall be to EEMUA
144
90/10 Copper Nickel Alloy pipe fittings shall comply with EEMUA 146. BW Tees shall be in
accordance with ASME B31.3 App 'D' for welding tees to ASME B16.9 where
rx 1/8 Db & Tc 1.5T
"Olets" shall as per MSS-SP-97. The internal bore of "Olets" shall be tapered with a slope of 1
in 3 minimum
Proof test reports of all fittings shall be submitted at the bid stage.
90/10 Copper Nickel Alloy pipe flanges (composite and solid) shall comply with EEMUA 145.
Weld neck flanges shall be bored to match pipe wall thickness. Lap joint flanges (Weld Neck
Stub Ends) shall be bored to match pipe wall thickness and shall be "LONG" type. All stub
ends shall be seamless.
Gasket contact surface finish for flanges and stub ends shall be Ra 3.2 to 12.5 m. Copper
Nickel facing discs on blind flanges and spades shall be 1.5mm thick and with a diameter
equal to or greater than diameter d4 in Table 1.3 of EEMUA 145.
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2.4 Piping Component Manufacture
2.4.1 Pipe Dimensions of pipe, except for copper-nickel material, shall be in accordance with ASME
B36.10, ASME B36.19, and API 5L as defined in the Purchase Order.
API 5L Gr. B pipes are specified in the Purchase Order, alternative offer of ASTM A106 Gr. B
pipes is acceptable.
Nominal Standard pipe lengths for carbon steel, galvanized carbon steel and austenitic
stainless steels shall be supplied in double random length as defined in the applicable
standard. If the applicable standard does not state the limits of a double random length the
following shall be adopted: - double random lengths with a minimum average length of 35 ft.
(10.7m) and a minimum length of 22ft (6.7 m).
Beveling the ends of the pipes shall be performed by machine cutting. This process shall
assure the production of clean, burr-free bevel cuts.
Unless indicated otherwise in the Purchase Order, steel pipes of 1-1/2" NB and smaller shall
be supplied with plain ends, square cut. Steel pipes 2" NB and larger shall be supplied with
butt weld ends, beveled in accordance with ASME B16.25 figures 2a or 3a, as applicable, to
match nominal pipe sizes and wall thicknesses of ASME B36.10, ASME B36.19, API 5L
and/or as specified on the Purchase Order
Galvanized carbon steel pipe 4" NB and smaller shall be supplied with ends threaded
Couplings shall be attached at one end, Threads shall conform to ASME B1.20.1 taper.
Couplings shall be to ASME B16.11 and ASTM A105N (Galvanized).
Dimensions of Copper-Nickel tube shall be in accordance with EEMUA 144. Copper-nickel
pipe shall be plain ended for 6" NB and smaller.
The mill tolerance applicable to all pipes shall be that required by the relevant product
specification unless stated otherwise in the Purchase Order.
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The inside bead of welded pipe shall be removed at each end of the pipe for a distance of
100mm with a gradual transition.
Finished pipe shall not include circumferential butt welds.
Spiral wound seam pipe shall not be used.
Jointers shall not be used.
Hydrostatic tests shall be carried out on all pipes in accordance with the referenced codes,
standards, and product specifications, using water containing 1% by volume of BP NID 260S
liquid or other equivalent biodegradable wetting agent. Pipes shall be flushed out with clean
potable water and drained and thoroughly dried after hydro test.
Maximum chloride content of water for hydro testing and flushing of austenitic stainless steel
and high alloy steel shall be 50ppm. The chloride content shall not exceed 30 ppm for
stainless steel valves, but shall not exceed 5 ppm when component to be tested is stainless
steel valve for which drying operation cannot be properly secured.
2.4.2 Fittings
Butt weld fittings shall conform to ASME B16.9 and ASME B16.28 (for short radius elbows) or
MSS SP-75 as applicable.
Socket weld fittings shall conform to ASME B16.11.
Threaded fittings shall conform to ASME B16.11 and ASME B1.20.1 (NPT).
Branch reinforcement fittings (sockolets, thredolets, weldolets, nipoflanges, etc.), shall comply
with MSS SP-97, and the relevant Vendor's standards. The Supplier shall confirm with
certification at the bid stage that the fittings comply with the requirements of ASME B31.3 Para
304.3.2 "Strength of Branch Connections" (i.e. verified burst test certificates or mathematical
calculations)
Prototypes of all butt-weld fittings supplied to this specification shall have been subjected to
burst tests by the Vendor to prove that they comply with the bursting strength requirements of
the Standards to which they relate (i.e. ASME B16.9 para.9 or MSS SP75 Para.4 as
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appropriate). Alternatively, subject to agreement with the Purchaser, the design of fittings may
be established by mathematical analysis to demonstrate compliance with the design.
Where seamless butt-weld fittings are specified, fittings of welded construction shall not be
substituted without the Purchaser's prior approval in writing.
Butt-weld forged tees shall have crotch radius and crotch wall thickness in accordance with
ASME B31.3 Appendix D for welding tee to ASME B16.9.
Manufacture of fittings shall be as follows:
- Fittings up to 1-1/2" NB
All fittings up to 1-1/2" NB shall be forged
- Fittings 2" NB or more
i. Seamless Fittings
Seamless fittings shall be forged or extruded. Fittings machined from bars are not
acceptable.
ii. Welded Fittings
Following the welding operation, which may be carried out on welded tubular elements, the
thickness of the fittings must be within the tolerances required by the reference standards.
If the welded fittings are manufactured from plate, the minimum wall thickness at any point
of fitting above 24" NB shall not be less than 0.3mm under the specified wall thickness.
The welds shall be made by an approved process. The seams shall be back-welded if the
welding process does not assure full penetration with, on the back, a weld reinforcement of
uniform thickness, free of appreciable distortion.
"Fabricated" fittings shall consist of a single rolled and welded plate. However, fabricated
fittings may, if necessary, be made with two longitudinal welds. For all "Fabricated" fittings,
the vendor shall submit, with his quotation, drawings showing all dimension and tolerances
of the fittings offered, giving details of method of manufacture, heat treatment (including
PWHT), showing location of all welds, with joint details, for review by the Purchaser
All welds shall undergo radiographic examination in accordance with the reference codes
and standards. Hardness testing is also required for service specified as "Sour Service" or
ISO 15156.
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Beveling the ends of the pipes shall be performed by machine cutting. This process shall
assure the production of clean, burr-free bevel cuts.
Fabricated fittings shall comply design requirements as per ASME B16.9 & ASME B31.3.
2.4.3 Flanges Dimensions of pipe flanges shall be in accordance with ASME B16.5 (or ASME B16.47 Series
A, above 24") as applicable; except for cupro-nickel flanges which shall be to EEMUA 145.
All carbon steel forgings shall be supplied in the normalized and tempered, or quenched
conditions.
The dimensions of orifice flanges shall be in accordance with ASME B16.36 or as specified on
datasheets.
The weld bevel of weld neck steel flanges shall be in accordance with ASME B16.25 Figures
2a or 3a as applicable, to match nominal pipe sizes and wall thickness to ASME B36.10,
ASME B36.19 or API 5L. Cupro-nickel weld neck and composite flanges shall be beveled in
accordance with EEMUA 145.
Spades, spacers and spectacle blinds shall be in accordance with ASME B16.48.
Facings on all ring type joint spades, spacers and spectacle blinds shall be female only. All
ring type joint contact faces, including side walls, shall have a surface roughness between 0.4
and 1.6 micrometers Ra, in accordance with ASME B46.1.
The gasket contact surface roughness for raised face flanges, spades, etc., shall be between
3.2 and 6.3 micrometers Ra (smooth finish) in accordance with ASME B46.1.
Flange facing for ring type joint (RTJ) flange shall have the following minimum hardness
values as follows:
Carbon Steel : 120 HB
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Austenitic Stainless Steel Gr.
316/316L
: 150 HB
Low Temperature Carbon Steel
(LTCS)
: 120 HB
Nickel Alloy : 230 HB
2.4.4 Bolting
Threading of all bolting shall be in accordance with ASME B 1.1, UNC series for diameters up
to and including 1" and 8" UN series for diameters 1 1/8" and larger.
All stud bolts shall be threaded full length and supplied with two heavy series hexagon nuts.
The length of stud bolt 2" diameter and larger has been calculated to allow for the use of
hydraulic bolt tensioning equipment, the extra length is included in the length stated on the
material requisition. 3 nuts shall be provided for all 2" diameter and larger bolts.
All bolting including NACE compliant bolting shall comply with the Piping Specification.
Bolts/nuts of material of construction B7M/2HM shall be 100% Hardness tested as per supplementary requirement S3 of ASTM A 193. All bolts and nuts shall be zinc coated (Hot-Dip) to ASTM A153.
All jack screws and hexagon headed bolts shall have threads extended to the underside of the
head.
All bolting shall be Hot Dip Galvanized in accordance with ASTM A153 and fully passivity. Nut
shall be re-tapped after galvanizing and be fully assembled with stud bolts prior to dispatch.
All bolting material shall comply with the manufacturing and testing requirement of the
applicable ASTM specifications.
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All NACE and non NACE compliant ASTM A320 L7M and 7M bolting shall be supplied impact
testing at minus 101C. All nuts to ASTM A194 Grade 4 and 7 shall be impact tested in
accordance with the 'Supplementary Requirements' S3 of ASTM A194 at minus 101 C.
The stud bolts shall be threaded along their entire length. The machining and surface
condition tolerances applicable to various threading shall be in conformity with the following
classes:
- Class 2A of ASME B1.1 Standard for Stud Bolts and Screws
- Class 2B of ASME B18.2.2 Standard for Nuts
2.4.5 Gasket Flat ring gaskets shall be compressed non-asbestos fiber in accordance with ASME B16.21.
- Gasket thickness shall be 2 mm unless specified otherwise.
- Asbestos in any form shall not be used in the manufacture and construction of gasket.
- Gasket shall be suitable for Hydrocarbon gas, oil, amine, potable water and wet sour
service as defined in ISO15156.
Spiral wound gaskets shall be in accordance with ASME B16.20. Unless stated otherwise
gasket shall be 4.5 mm thick graphite filled with 3 mm thick inner and outer centring ring to
ASME B16.20.
- Material inner ring and center ring shall be per requisition.
- Material of winding shall be per requisition.
- All spiral wound gasket shall comply with ISO15156.
ASME RTJ metal seal rings shall comply with the applicable dimensional standard ASME
B16.20 The RTJ gasket material shall be as follows:
- For Alloy 625 Flange: Alloy 625 (UNS N06625) Oval ring gasket, 220HB Max.
- For SS Flange: SS316L Oval ring gasket, 135HB Max.
- For CS & LTCS Flange: Soft Iron Oval ring gasket, 90HB Max.
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2.4.6 Other Fittings
2.4.6.1 Dimension and Weights. Forged fittings of class 3000, 6000 or 9000 rating shall be in accordance with ASME B16.11.
Wrought butt welding fittings shall be in accordance with ASME B16.9. Integrally reinforced
branch connection fittings shall be in accordance with MSS SP-97.
Low temperature carbon steel forgings ASTM A350 LF2 shall be supplied to class 1 for minus
46C design temperature
2.4.6.2 Materials of Manufacture Unless otherwise specified, thread or socket welding forged carbon steel fittings shall be
supplied with material according to ASME B16.11, and wrought butt welding fittings shall be
supplied with material according to ASME B16.9.
Fitting machined from rolled bar or bar stock are not permitted.
2.4.6.3 Butt welding Tees Crotch Thickness and Radius Tees shall be furnished with radii and thickness limits as specified in Table D300 in Appendix
D of ASME B31.3.
2.4.6.4 Fabricated Fittings (Tees and Reducers) Mitered type fittings and fabricated tees, made by joining sections of pipe, are not permitted.
Tapered conical reducers (reducers without knuckle radius on both ends as illustrated in
ASME B 16.9) are not permitted.
2.4.6.5 Oversize Ends Beveled and plain ends of 2" NB and smaller pipe and swage nipples shall be capable of fitting
into ASME B16.11 socket welding connections, to the full depth of the fitting socket. Oversize
ends are not permitted
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2.4.6.6 Integrally Reinforced Branch Fittings ("Olet")
Integrally reinforced branch connection fittings shall reinforce the header pipe wall thickness
with equivalent material, and provide 100 percent header pipe strength in accordance with the
requirements of MSS SP-97 and the applicable Piping Code.
Branch reinforcing fittings shall be designed in accordance with the requirement of ASME
B31.3. Supplier shall submit sample calculations for approval with his bid.
2.4.6.7 Substitutions It is permissible to substitute seamless fittings in place of welded fittings of the same grade
and wall thickness.
Other substitutions are not permitted without Buyer approval.
2.5 Fabrication - Fabrication and Manufacturing by Welding
Fabrication of pipe or fitting by welding shall be in accordance with the requirements of
the specification referenced for manufacture. In addition, welding preheat temperatures
shall be in accordance with applicable Piping Code, i.e. ASME B31.3, ASME B31.8, etc.
- Repairs
Casting repairs are not permitted for cast iron, malleable iron, ductile iron, brass, or
bronze materials. Major repairs of castings, as defined by ASTM A217, are not permitted.
Limitations on imperfections, and method and extent of required examination for repairs,
shall be the same as required for the original castings.
Repair of castings by peening or impregnation with metallic on nonmetallic materials is
not permitted.
- Modification
Modification or repair, including the re-facing of flange gasket seating surfaces, shall be in
accordance with referenced specifications.
- Post Weld Heat Treatment
Where welding is performed as part of the manufacturing process, pre and post weld heat
treatment shall be carried out in accordance with a qualified heat treatment procedure
specification as part of the Contractor's Company-approved welding procedure
specification and in conformance with the requirements of ASME B31.3/ ASME IX.
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The necessity for preheating and the required temperature shall be specified in the welding
procedure and demonstrated by procedure qualification. The pre-heat temperature shall
take into account the type of joint, the metal thickness, the composition of the material and
the heat input to each run of welding
3. INSPECTION AND TESTING
3.1 Pressure Testing
Each length of pipe shall be subjected to a hydrostatic test in accordance with ASTM, ASME,
or API specification referenced for manufacture. Where there is a choice in the specification of
hydrostatic test or other NDE (Non-destructive Examination), the hydrostatic test shall be
performed. If no hydrostatic test is required in the Vendor's specification, then the ASTM A530
hydrostatic test shall be performed.
For Austenitic stainless pipes, only water containing less than 50 ppm (0.050 mg/litre) chloride
ion shall be used for pressure testing
3.2 Examination
Examination is required only where specified by the specification and grade of manufacture, or
where specified in the Item Description or in the PO.
Surfaces to be examined shall be clean and free from surface conditions that may mask
unacceptable conditions.
All items shall be free from crack, scores, laps and other defects.
Personnel performing and evaluating examinations other than visual examination and
hardness testing shall be qualified in accordance with the ASNT SNT-TC-1A. Only Level II and
Ill personnel shall be authorized to interpret results for radiographic and ultrasonic
examinations.
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3.3 Testing
3.3.1 Mechanical Testing Testing shall meet the minimum requirements of the referenced product specification as stated
on the Purchase Order or as otherwise stated in the project specifications.
Test pieces may originate from prolongations of the forgings or material which has undergone
the same deformation and heat treatment as the component or individual components which
are designated to be sectioned for testing purposes.
One set of mechanical tests shall be conducted per heat and/or per heat treatment batch. For
pipe, where heat treatment is carried out in a continuous furnace, one set of tests shall be
conducted every 60m for the same heat and size (wall thickness and diameter).
Tests shall be conducted after final heat treatment in accordance with the appropriate
manufacturing standards, plus any supplementary requirements identified in this Specification
3.3.2 Charpy V-Notch Impact Testing
Charpy impact tests shall be carried out on material when stipulated in the referenced codes
or specifications or on the material requisition or relevant sections of this specification. Tests
shall be carried out in accordance with the requirements of the referenced product
specification and as required by EEMUA 153, supplement to ASME B31.3 (to the method of
ASTM A370).
For Pipe, test samples shall be cut out from the finished end.
Charpy tests shall be conducted in accordance with ASTM E23 or BS EN 10045-1. Test
temperature and acceptance criteria shall be defined by the Purchaser.
If the specified average impact value is not attained or if one specimen only shows a value
less than the specified minimum individual value, then three additional specimens shall be
selected from a position similar to that from which the set of specimens under consideration
were taken. The average impact value of the six specimens shall be not less than the
specified minimum average value and not more than two specimens shall show values below
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the specified minimum average value, only one of which may be below the specified individual
value.
3.3.3 Non Destructive Examination (NDE)
All Pipe, Flanges, and Fittings shall be tested and inspected in accordance with their
referenced product specification and shall be subject to the following additional Non-
destructive examination, which shall be performed after any heat treatment. NDE shall also
apply to any repair welds. MPI or DPI shall be performed after any machining operations. MPI
shall be used for ferrous materials and DPI for stainless steel materials. No cracks, linear
defects or dye Penetrant indications shall be permitted.
For pipe, fittings and flanges with a wall thickness greater than 20mm, 100% MPIIDPI shall be
performed over the entire machined surface including 100mm from the bevel.
The external surfaces of all flanges and fittings, and welds of lateral tees shall also be
inspected by 100% MPIIDPI.
Surface defects such as slivers, sharp notches and scores may be machined or ground out
provided that the wall thickness is not reduced locally by more than the minimum required
section thickness. No cracks or linear defects shall be permitted. The remaining wall thickness
shall be verified by ultrasonic or other calibrated instruments. If the section thickness is
reduced below the minimum required section thickness, the flange shall be rejected. Material
shall be rejected where imperfections are not scattered but appear over a large area in excess
of what is considered a workmanlike finish by the Purchaser's Inspector
100% Ultrasonic examination of all applicable Pipe, Flanges and Fittings shall be carried out in
accordance with ASME V Article 5, using both compression and shear wave probes over the
entire surface. Ultrasonic testing shall meet the requirements of ASTM A388. When using
compression waves, any area giving an indication equal to or greater than a signal received
from a 3mm flat-bottom hole shall be rejected. Multiple indications with an amplitude
exceeding 50% of the indication from the calibration hole, accompanied by a loss of back
reflection exceeding 50% shall be rejected. Any indication that results in a complete loss of
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back wall echo shall be rejected. For shear beam examination indications which are equal to
or greater than those obtained from a rectangular notch 25mm long and having a depth not
greater than 5% of the nominal wall thickness are to be rejected.
NDE shall be performed after final heat treatment and machining.
MPI examination shall be completed in accordance with ASME Section V, Article 7.and ASTM
E709.
Ultrasonic examination shall be completed in accordance with ASME Section V, Article 5, and
ASTM A388 as applicable.
DPI examination shall be completed in accordance with ASME Section V, Article 6.
Suppliers shall use only qualified NDE Operators and, as a minimum, the operators shall have
the following qualifications or equivalent:
Ultrasonic PCN-WSB-UT-001-87 Level 2
Dye Penetrant PCN-WSB-PT-001-87 Level 2
Magnetic Particle PCN-WSB-MT-001-87 Level 2
Radiography PCN-WSB-RT-001-88 Level 1 with Level 2
interpreter
PCN-Personnel Certification in Non Destructive Examination
Note: Equivalent qualifications are subject to approval by the Purchaser / Company.
4. IDENTIFICATION AND TAGGING
4.1 Marking Each fitting or flange shall be marked in strict accordance with the specification referenced for
manufacture, or MSS SP-25 as a minimum. Pipe shall be marked in strict accordance with the
ASTM, ASME, or API specification of manufacture.
In addition to the marking required by the relevant specification, each item 2" NB and larger
shall have its stock code number, Purchase Order number and Purchase Order item number
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painted on. For pipe this shall be near each end. For items 11/2" NB and smaller, these
marking shall be marked on metal tag (for pipe), or on the packing carton (for flanges, and
fittings).
If blasting and priming of pipe are required by the Item description or the PO, then the original
marking such as material grade designation, schedule, and heat number shall be re-stenciled
on the exterior of the pipe at 2 meters intervals with paint compatible with primer.
Pipe, fittings, and flanges shall be color coded when specified in the Item Description or PO.
Color coding is intended to supplement, not replace, normal identification marking required by
ASTM, ASME, API, MSS, or other standards.
Marking paint or ink shall be resistant to salt water atmosphere, tropical or freezing climates,
or similar attack; it shall not, in itself, cause corrosion of the piping components to which it is
applied. For austenitic stainless steel or nickel alloy piping component, it shall not contain
chlorides, nor shall it contain metals, such as zinc or lead, that may cause corrosive attack at
high temperatures.
Paint shall not be applied to the inside of pipe, threads, weld bevels, gasket surfaces, symbols,
or markings, if doing so would obliterate identification.
In addition to the above markings required by the relevant product specifications and the
colour code marking, the following markings shall appear on each item as appropriate where
space permits:
- Material Specification and Grade
- Cast or Heat Number (Shall be permanent marking)
- Batch Number (as applicable)
- Flange Rating
- Nominal Diameter
- Wall Thickness
- Ring Joint Number
- Purchase Order Number and Purchase Order Item Number
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- Stock Code Number (as applicable)
Where space is not available (with the exception of Cast/Heat Number) it shall be stamped on
a stainless steel tag wired to the item.
Marking materials used on austenitic stainless steel material shall not contain any harmful
metals such as zinc, aluminum, lead, copper or chloride containing compounds that will cause
corrosive attack when heated.
Pipe with wall thickness less than 5mm and items manufactured from high yield carbon steel,
type 316 stainless steel and cupro-nickel materials shall be marked by vibro-etching. All other
materials, including impact tested carbon steel, shall be marked by cold stamping using round
nosed low stress stamps, vibro-etching, dot stamps, or Supplier's rolling stamp method.
Punching or stamping shall only be used on unstressed areas and the punching depth shall
not exceed 1mm.
Marking shall appear on each individual length of pipe and shall be highlighted with a circle of
paint. This paint shall be the same as that used for color coding.
Galvanized pipe shall be marked by stenciling in letters not less than 20mm high with a
waterproof material that is not injurious to the coating.
4.2 Color Coding A system of color marking shall be used to identify pipe, fittings and flanges for procurement
identification purposes. Suppliers are required to brush paint or otherwise apply the color
markings. The color-marking schedule is detailed in Section 4.3 below.
The paint to be used shall be Drynamel's Steel Identification Paint, Grade B98 or equivalent
and shall conform to the colors shown below to BS 4800.
Marking materials shall not contain any harmful metals or metallic salts such as zinc,
aluminum, tin, lead, copper or chloride containing compounds which would adversely affect
the material on heating or welding
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Pipe shall be marked as follows:
- 1 " NB and smaller- broad rings painted 1.5m apart.
- 2" NB and larger- broad line(s) painted along the entire length of pipe.
Galvanized steel and Cupro-Nickel pipe do not require identification by color marking.
4.3 Color Marking Schedule Marking shall not encroach upon butt weld ends prepared for welding.
All CS, LTCS, 3168S, Duplex 8S, high strength carbon steels and Alloy 625 UN8 N06625
materials shall be color coded as follows:
MATERIAL COLOR BS 4800 REF ASTM A106 Gr.B Light Green 14E51 ASTM A234 WPB Light Green 14E51 ASTM A105N Light Green 14E51 ASTM A333 Gr.6 Light Brown 08C37 ASTM A420 WPL6 Light Brown 08C37 ASTM A350 LF2 Light Brown 08C37 ASTM A312 TP316L Light Blue 18E49 ASTM A403 TP316L Light Blue 18E49 ASTM A182 F316L Light Blue 18E49 ASTM A790 UNS S31803 Red 04E53 ASTM A815 UNS S31803 Red 04E53 ASTM A182 F51 (UNS S31803) Red 04E53 API 5L X65 White/Green 00E55/12D45 MSS SP 75 WPHY 65 White/Green 00E55/12D45 ASTM A694 F65 White/Green 00E55/12D45 ASTM B444 (UNS N06625) Yellow 10E53 ASTM B564 (Alloy 625 UNS N06625 Forgings) Yellow 10E53 ASTM B705 (Alloy 625 UNS N06625 Welded Pipe)
Yellow 10E53
HYCS + Alloy 625 UNS N06625 internal cladding Yellow/White 10E53/00E55
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Note: For materials shown with 2 colors above, one stripe of each shall be applied for
identification purposes.
5. PREPARATION FOR SHIPMENT Carbon steel and chrome steel pipe, fittings, and flanges, when not galvanized or prime
coated, shall be furnished with the 's standard protective mill coating on external surface only.
Austenitic stainless steel pipe, fittings, and flanges shall not be coated.
Austenitic stainless steel or nickel alloy pipe, fittings, and flanges shall be protected from
ferritic contamination and chloride attack such as might occur from exposure to salt water
spray or atmosphere during shipment, cleaning, fabrication, testing, or storage. Consideration
shall also be given to enclosing or wrapping in a vapor proof barrier material.
Piping components with beveled ends shall be palletized and shrink wrapped or banded with
steel or plastic strapping. Supplier shall submit their standard packing procedure for approval.
Threaded ends of pipe shall be fitted with plastic thread protectors. Threaded or socket weld
openings in fittings and flanges shall be fitted with plastic plugs. Pipe ends shall be supplied
with protective plugs or caps, to protect weld bevels.
Flanges shall be suitably shipped on pallets or in wooden crates and shrink-wrapped or tied
down and shall have cardboard, pressboard, rubber, or plastic face protectors between layers
of flanges in order to avoid any contact. Single loose flanges shall have high-impact plastic
protectors secured with lock plugs (integral or separate). Wood, cardboard or pressboard
protectors (that can absorb water) are not acceptable as flange face protectors.
Supplier shall be responsible for suitably shielding the open ends of pipes, and flanges to
protect weld
I threaded ends from damage during handling and shipment.
Each length of pipe shall be clear of debris, thoroughly clean inside and out, and free of any
dirt and foreign matter before shielding the ends.
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Machined surfaces other than weld bevels (e.g. threads, flange faces, gasket seating surfaces)
shall be coated with a corrosion inhibitor.
Pipe and fittings shall not be transported as open above deck cargo without prior written
approval of the Purchaser.
6. PROTECTION AGAINST CORROSION AND MECHANICAL DAMAGE The Supplier shall ensure that all items are protected against corrosion, contamination and
mechanical damage in accordance with the Supplier's standard procedures that shall be
submitted to the Purchaser for approval.
A copy of the instructions for the renewal and/or removal of any rust preventatives shall be
supplied with the goods by the Supplier.
Threaded ends shall be greased and fitted with a plastic cap or plastic thread protector to
ensure adequate thread protection.
Pipe beveled ends shall be coated with a Purchaser approved corrosion preventative and
fitted with a plastic cap.
All carbon steel pipes shall have a Purchaser approved desiccant stapled inside the plastic
end cap at each end of the pipe.
Any strapping shall be stainless steel or plastic coated steel with a minimum thickness of
0.27mm.
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7. DOCUMENTS SUBMITTALS
7.1 Certificate of Compliance Supplier shall furnish certification of material composition I chemistry, radiographic and
hydrostatic testing in compliance with ASTM, API, or ASME specification. Certification shall be
as follows. The certification levels shown shall also apply to all NDE.
Basic Material Certification Level BS EN 10204-2004
C.S (Galv) 2.2 C.S & LTCS. 3.1 S.S. 3.1 Duplex S.S 3.1 Alloy 625 UNS N06625 3.2 C.S High Yield 65 ksi Cladded with 3mm Thk.(min.) Alloy 625 UNS N06625
3.2
C.S High Yield 65 ksi 3.1 Copper / Nickel Alloy 3.1 Fiberglass Reinforced Plastic 3.1 Bolting materials 3.1
And contain following information as a minimum:
- Chemical Analysis by Product
- Mechanical Properties
- Heat Treatment Statement
- Heat Number
- Hardness Report (Compliance with 18015156)
The certification shall state the Purchaser's PO Number, Item Code Numbers, name and
address of Supplier or Vendor, and shall be certified by Supplier's authorized agent.
7.2 Material Test Reports For impact tested steel, low alloy steel, chrome steel, stainless steel, or nickel alloy pipe,
fittings and flanges, Supplier shall furnish the Manufacturer MDRs (Manufacturers Data
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Reports) showing actual results of chemical analysis and mechanical test in compliance with
the referenced ASTM specification. The test reports shall be originated by the primary
material and shall be traceable to each item or length of pipe through legible paint stenciled
heat numbers or equivalent. The documents shall be identified with Buyer's PO number and
Item Code number and shall be signed by the Vendor's authorized agent.
All chemical analysis shall be certified by product check analysis with the exception of
galvanized carbon steel for which ladle analysis will be acceptable.
Vendor's reports, etc., shall be kept available by the Supplier for examination by the Company
or his representative, for a minimum period of 5 years.
The actual temperature of all heat treatment shall be recorded on the material certificates.
The supplier shall ensure that appropriate certificates showing mill heat or batch markings, are
received I delivered for all furnished materials. Materials furnished without documentation are
unacceptable.
The Supplier shall be responsible for maintaining an effective Quality system and maintaining
records in accordance with the requirements of the relevant procedures I specifications
contained in Purchase Order
7.3 Welding and NDE Procedures The welding procedures and qualifications shall be in accordance with ASME Section IX. The
qualifications shall include hardness testing in accordance with ASTM A370. The hardness
testing shall be performed on the weld and the heat affected zone and after required heat
treatment.
The NDE procedures shall be in accordance with ASME Code Section V.
For all fabricated piping items, the welding procedures, procedure qualifications, and NDE
procedures for the following materials shall be submitted for authorization.
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