NFPS Offshore Compression Complexes Project COMP2

COMPANY Contract No.: LTC/C/NFP/5128/20

CONTRACTOR Project No.: 033734

Document Title

:

SPECIFICATION FOR BOLTS, NUTS, AND GASKETS FOR CP6S AND CP7S COMPLEXES

COMPANY Document No.

: 200-20-PI-SPC-00018

Saipem Document No.

: 033734-A-D-00-SPM-TB-S-10003

Discipline

: PIPING

Document Type

: SPECIFICATION

Document Category/Class

: 1

Document Classification

: Internal

B

A

10-Mar-2023

07-Feb-2023

Issued for Approval

Rifai

Khairul Harun

Suhaili/Matteo

Issued for Review

Alya Izzati

Khairul Harun

Suhaili/Matteo

Khai Harun

Digitally signed by Khai Harun Date: 2023.03.11 06:35:08 +08’00’

Suhaili Yunus

Digitally sig ned by Suhaili Yunus DN: cn=Suh aili Yunus, o u=Users, email= Suhail i.Yunu s@W orley.com Date: 202 3.03 .11 21:56:35 +08’00 ’

MAGNAN I MATTEO

Digitally signed by MAGN ANI MATTEO DN : cn=MAGNANI MATTEO, o=SAIPEM, ou=LAPI, email=matteo.magnani@saipe m.com, c=US Date: 2023.03.13 09:31:14 +08’00’

REV.

DATE

DESCRIPTION OF REVISION

PREPARED BY

CHECKED BY

APPROVED BY

Saipem S.p.A.

Company No._Rev. 200-20-PI-SPC-00018_B

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NFPS Offshore Compression Complexes Project COMP2

REVISION HISTORY

Revision

Date of Revision

Revision Description

A1

A

B

18-Jan-2023

07-Feb-2023

10-Mar-2023

Issued for Inter-Discipline Check

Issued for Review

Issued for Approval

HOLDS LIST

Hold No

Hold Description

Company No._Rev. 200-20-PI-SPC-00018_B

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NFPS Offshore Compression Complexes Project COMP2

TABLE OF CONTENTS

1.1 Project Objective … 4 1.2 Project Scope … 4

2.1 Definitions … 6 2.2 Abbreviations … 8

3.1 Company Documents … 10 3.2 Project Documents … 11 3.3 Contractor Documents … 11 3.4 International Codes and Standards … 11

5.1 General Requirements … 16 5.2 Coating … 18 5.3 Testing and Inspection … 24

6.1 General requirements … 25 6.2 Material Requirements … 27 6.3 Testing and Inspection … 27

12.1 Appendix 1 Bolting Selection Tables … 30

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NFPS Offshore Compression Complexes Project COMP2

gas production. The reservoir pressure in the North Field has been declining due to continuous production since the early 1990s. The principal objective of the NFPS Project is to sustain the plateau from existing QG South Operation (RL Dry Gas, RGE Wet gas) and existing QG North Operation (QG1 & QG2) production areas by implementing an integrated and optimum investment program consisting of subsurface development, pressure drop reduction steps and compression. Refer to the figure below for a schematic of the North Field.

Qatargas Operating Company Limited is leading the development of the North Field Production Sustainability (NFPS) Project.

The objective of this Project includes:

Achieve standards of global excellence in Safety, Health, Environment, Security and Quality

performance.

Sustain the Qatargas North Field Production Plateau by installing new Compression Complex facilities CP6S & CP7S in QG south with integration to the existing facilities under Investment #3 program.

Facility development shall be safe, high quality, reliable, maintainable, accessible, operable,

and efficient throughout their required life.

The Project Scope includes detailed engineering, procurement, construction, transportation & installation, hook-up and commissioning, tie-in to EXISTING PROPERTY and provide support for start- up activities of the following facilities and provisions for future development. The WORK shall be following the specified regulations, codes, specifications, and standards, achieves the specified performance, and is safe and fit for purpose in all respects.

Offshore

CP6S and CP7S Compression Complexes that are part of QG-S RGE facilities as follows:

CP6S Compression Complex

Compression Platform CP6S, Living Quarters LQ6S, Flare FL6S

Bridges BR6S-2, BR6S-3, BR6S-4, BR6S-5

Bridge linked Tie-in to RP6S

Production from existing wellheads (WHP6S & WHP10S) and new wellhead (WHP14S) are routed via riser platform RP6S to compression platform CP6S to boost pressure and export to onshore via two

bon steel looping trunkline from

RP6S (installed by EPCOL). CP6S is bridge-linked to RP6S.

CP7S Compression Complex

Compression Platform CP7S, Living Quarters LQ7S, Flare FL7S

Bridges BR7S-2, BR7S-3, BR7S-4, BR7S-5

Bridge linked Tie-in to RP7S

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NFPS Offshore Compression Complexes Project COMP2

CP7S shall receive production from existing wellheads (WHP5S & WHP7S) and new wellhead (WHP13S). There is only one export line for CP7S through the existing export pipeline from WHP7S. CP7S is bridge-linked to RP7S.

RGA Complex Destressing

Migration of the Electrical power source, Telecoms, Instrumentation and Control systems from WHPs and RPs hosted by RGA to the respective Compression Complexes listed below:

WHP6S, WHP10S, WHP14S, RP6S and RP10S to CP6S Compression Complex

WHP5S, WHP7S, WHP13S and RP7S to CP7S Compression Complex

Destressing of Telecoms, Instrumentation and Control system in RGA Complex Control Room, which would include decommissioning and removal of telecom system devices and equipment that would no longer be required post migration and destressing activity.

Onshore

An Onshore Collaborative Center (OCC) will be built under EPC-9, which will enable onshore based engineering teams to conduct full engineering surveillance of all the offshore facilities. The OCC Building will be located in Ras Laffan Industrial City (RLIC) within the Qatar Gas South Plot. MICC & Telecommunication, ELICS related scope will be performed in the OCC building.

Figure 1.2.1: NFPS Compression Project COMP2 Scope

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NFPS Offshore Compression Complexes Project COMP2

Definition

Description

COMPANY

Qatargas Operating Company Limited.

CONTRACTOR

Saipem S.p.A.

DELIVERABLES

FACILITIES

MILESTONE

All products (drawings, equipment, services) which must be submitted by CONTRACTOR to COMPANY at times specified in the contract. All machinery, apparatus, materials, articles, components, systems and items of all kinds to be designed, engineered, procured, manufactured, constructed, supplied, fabricated, tested and permanently installed by CONTRACTOR at SITE in connection with the NFPS Project as further described in Exhibit 6.

A reference event splitting a PROJECT activity for progress measurement purpose.

PROJECT

NFPS Offshore Compression Complexes Project COMP2

SITE

SUBCONTRACT

SUBCONTRACTOR

(i) any area where Engineering, Procurement, Fabrication of the FACILITIES related to the CP6S and CP7S Compression Complexes are being carried out and (ii) the area offshore required for installation of the FACILITIES in the State of Qatar. Contract and CONTRACTOR for the performance of a certain portion of the WORK within the Project. Any organization selected and awarded by CONTRACTOR to supply a certain Project materials or equipment or whom a part of the WORK has been Subcontracted.

SUBCONTRACTOR

signed

by

WORK

Scope of Work defined in the CONTRACT.

WORK PACKAGE

The lowest manageable and convenient level in each WBS subdivision.

VENDOR

MATERIALS

The person, group, or organization responsible for the design, manufacture, testing, and load-out/shipping of the Equipment/ Material. The ability to trace material to its MTR or COC, and its subsequent the fabrication/manufacture of a component, subcomponent or system

TRACEABILITY

use

in

Company No._Rev. 200-20-PI-SPC-00018_B

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NFPS Offshore Compression Complexes Project COMP2

MTR

SHALL

SHOULD

MAY

records

thickness,

document which

A grade, chemistry/chemical composition, strength and through- thickness properties, results of tests, examinations, repairs, and/or treatments (e.g. heat treatment, NDE) which are required by the material specification and any supplemental or special requirements.

requirement.

recommended.

od as a mandatory

and upon evaluation of a review of the circumstances of the issue in question.

Company No._Rev. 200-20-PI-SPC-00018_B

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NFPS Offshore Compression Complexes Project COMP2

Code

Definition

AISI

API

ASME

CMTR

CRA

CSCC

DN

DFT

EPC

FRP

H2S

HB

HRB

HRC

ISO

ISPM

ITP

LWN

NFPA

NFPS

NPS

PMI

QCP

QG

American Iron and Steel Institute

American Petroleum Institute

American Society of Mechanical Engineers

Certified Material Test Report

Corrosion Resistance Alloy

Chloride Stress Corrosion Cracking

Nominal Diameter

Dry Film Thickness

Engineering Procurement and Construction

Fiber-Reinforced Plastic

Hydrogen Sulfide

Hardness Brinell

Hardness Rockwell B

Hardness Rockwell C

International Organization for Standardization

International Standard for phytosanitary measure

Inspection and Test Plan

Long Weld Neck

National Fire Protection Association

North Field Production Sustainability

Nominal Pipe Size

Positive Material Identification

Quality Control Program

Qatargas Company Limited

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NFPS Offshore Compression Complexes Project COMP2

RF

Raised Face

Code

Definition

RGE

RTJ

SCC

SMYS

SSPC

UNS

UN

RasGas Wet Gas Asset

Ring Type Joint

Stress Corrosion Cracking

Specified Minimum Yield Strength

Society for protective Coating

Unified Numbering System for Metals and Alloys

Unified National

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NFPS Offshore Compression Complexes Project COMP2

The following codes, standards and specification are referenced within the document shall be considered as part of this specification. Conflict among applicable specification and / or codes shall be brought to the attention of the COMPANY for resolution COMPANY decision shall be final and shall be implemented. The latest editions of codes and specification effective as on date of contract shall be followed.

In general, the order of precedence shall be followed:

a) Qatari Governmental and Regulatory Requirements

b) COMPANY Procedures, Policies and Standards (Exhibit 5 Appendix I)

c) Project Specifications.

d) Industry Codes and Standards

e)

If CONTRACTOR/SUBCONTRACTOR deems any deviations from the specifications will result in significant project cost and schedule saving, proposal to such deviations shall be submitted to COMPANY for review and approval. CONTRACTOR/SUBCONTRACTOR shall not proceed with any deviation to the specifications without prior COMPANY approval. In general, all design activities shall conform to legal and statutory regulations, and recognized industry best practices.

S. No

Document Number

Title

PRJ-PJL-PRC-004_07

Facilities Engineering and Vendor Document Numbering Procedure

PRJ-PJL-PRC-005_21

Facilities, System and Unit Number Codes and Descriptions Procedure

PRJ-PJL-PRC-006_01

Project Information Handover Procedure

PRJ-PJL-PRC-007_01

PRJ-PJL-PRC-008_15

PRJ-PJL-PRC-048_11

PRJ-PJL-PRC-049_01

SmartPlant Engineering Applications & Drafting (CAD) Standard

Equipment Numbering Philosophy Facilities Documentation Metadata Requirements Procedure Project Information Handover, Verification and Acceptance Procedure

PRJ-PJL-PRC-080_02

AIMS: Tag Management System (TMS)

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NFPS Offshore Compression Complexes Project COMP2

S. No

Document Number

Title

200-20-CE-SPC-00014

200-20-PI-SPC-00017

200-20-PI-SPC-00019

200-20-PI-DEC-00002

ONS-OTS-MNT-003

Material Corrosion Requirement in Sour Service System for CP6S and CP7S Complexes Specification for Material Traceability and Documentation Requirements (FEED) Specification for Positive Materials Identification (PMI) (FEED) Specification For Flanged Joint Management (FEED) Spare Parts and Material Identification, Procurement, Delivery, Receipt and Payment- OTS-OED Supported Projects Procedure (FEED)

COMP2-SPM-PE-PRC-00001

Document Numbering Procedure

S. No

Document Number

Title

Not Applicable

S. No

Document Number

Title

API SPEC 6FB

API SPEC 20E

Specification for Fire Test for End Connections (3rd Edition 1998)

Alloy and Carbon Steel Bolting for Use in the Petroleum and Natural Gas Industries (2022).

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NFPS Offshore Compression Complexes Project COMP2

S. No

Document Number

Title

ASME B16.5

ASME B16.20

ASME B16.21

ASME B16.47

Pipe Flanges and Flanged Fittings NPS 1/2 Through NPS 24 Metric/Inch Standard (2020)

Metallic Gaskets for Pipe Flanges Ring-Joint, Spiral-Wound, and Jacketed (2017)

Non-metallic Flat Gaskets for Pipe Flanges (2021)

Large Diameter Steel Flanges NPS 26 Through NPS 60 Metric/Inch Standard (2020)

ASME B16.48

Line Blanks (2020)

ASME B31.3

Process Piping (2022)

ASME PCC-1

Guidelines for Pressure Boundary Bolted Flange Joint Assembly (2022)

ASME B1.20.1

Pipe Threads, General Purpose (Inch) (2013)

ASME B1.1

10. ASME B18.2.1

11. ASME B18.2.2

12. ASME SEC VIII Div 1

Unified Inch Screw Threads (UN and UNR Thread Form) (2019)

Square, Hex, Heavy Hex, and Askew Head Bolts and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag Screws (Inch Series) (2012)

Nuts for General Applications: Machine Screw Nuts, Hex, Square, Hex Flange, and Coupling Nuts (Inch Series) (2022)

BPVC Section VIII - Rules for Construction of Pressure Vessels - Division 1 (2021)

S. No

Document Number

Title

1. ASTM A193

Standard Specification for Alloy-Steel and Stainless-Steel Bolting for High Temperature or High-Pressure Service and Other Special Purpose Applications (2022)

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NFPS Offshore Compression Complexes Project COMP2

S. No

Document Number

Title

2. ASTM A194

3. ASTM A320

4. ASTM A700

5. ASTM A962

6. ASTM F436

7. ASTM E18

8. ASTM F467

9. ASTM F468

10. ASTM B117

11. ASTM B568

12. ASTM B571

13. ASTM B850

14. ASTM D610

15. ASTM D3363

Standard Specification for Carbon, Alloy Steel and Stainless-Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both (2022)

Standard Specification Stainless-Steel Bolting Service (2022)

for Alloy-Steel and for Low-Temperature

Standard Guide for Packaging, Marking, and Loading Methods for Steel Products for Shipment (2019)

Specification

Standard Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the Creep Range (2022)

for

Standard Specification Washers Inch and Metric Dimensions (2013)

for Hardened Steel

Standard Test Methods for Rockwell Hardness of Metallic Materials (2022)

Standard Specification for Nonferrous Nuts for General Use (2013)

Standard Specification for Nonferrous Bolts, Hex Cap Screws, Socket Head Cap Screws, and Studs for General Use (2022)

Standard Practice for Operating Salt Spray (Fog) Apparatus (2019)

Standard Test Method for Measurement of Coating Thickness by X-Ray Spectrometry (2021)

Standard Practice Testing of Metallic Coatings (2018)

for Qualitative Adhesion

Standard Guide for Post-Coating Treatments of for Reducing Steel Embrittlement (2022)

the Risk of Hydrogen

Standard Test Method for Evaluating Degree of Rusting on Painted Steel Surfaces (2017)

Standard Test Method for Film Hardness by Pencil Test (2022)

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NFPS Offshore Compression Complexes Project COMP2

16. ASTM D5065

17. ASTM D5402

18. ASTM D6677

19. ASTM F1470

20. ASTM F1941

Standard Guide for Assessing the Condition of Aged Coatings on Steel Surfaces (2021)

Standard Practice for Assessing the Solvent Resistance of Organic Coatings Using Solvent Rubs (2019)

Standard Test Method for Evaluating Adhesion by Knife (2022)

Standard Practice for Fastener Sampling for Specified and Performance Inspection (2022)

Mechanical

Properties

Standard Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric (2017)

S. No

Document Number

Title

BSI BS EN 10204

Metallic product Types of inspection documents (2004)

BSI BS ISO 1432

BSI BS ISO 1817

vulcanized

Rubber, Determination of (Gehrman test) (2021)

or

thermoplastic

low-temperature stiffening

Rubber, thermoplastic Determination of the effect of liquids (2022)

vulcanized

or

BSI BS EN ISO 9001

Quality Management Systems Requirements (2021)

S. No

Document Number

Title

ISPM 15

International Standards Measures No. 15. (2017)

for Phytosanitary

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NFPS Offshore Compression Complexes Project COMP2

S. No

Document Number

Title

1. NACE MR0175/ISO 15156

Petroleum and Natural Gas Industries Materials for Use in H2S-Containing Environments in Oil and Gas Production (4th Edition 2022)

S. No

Document Number

Title

1. SSPC PA 2

Measurement of Dry Coating Thickness with Magnetic Gages (2022)

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NFPS Offshore Compression Complexes Project COMP2

This Specification covers the technical requirements of bolts, nuts, metallic and non-metallic gaskets for Offshore topside piping as per ASME B31.3. The requirements stated in the specification are supplementary to the applicable reference international codes and standards for this project. This specification does not cover foundation bolts for structural steel works, well head Christmas tree, subsea pipeline, reference spec for subsea pipeline and Bolts, Nuts & Gaskets for Onshore piping.

5.1.1 In general, the requirements specified in this document shall be applicable, unless specified

otherwise.

5.1.2 All manufacturing and testing procedures, mill certificates, qualification certificates shall be

submitted for purchaser review and approval prior to start of work.

5.1.3 Supplier, sub-suppliers, and manufacturer of material shall be qualified as per approved vendor

list.

5.1.4 Nuts, studs, and threads shall comply with ASME B16.5 Table 1.1-3 “Flange Bolting Dimensional Recommendations.” Nuts for bolts shall be heavy hex, semi-finished. Stud bolts shall be threaded full length.

5.1.5 Nuts (irrespective of size) shall not be machined from bar stock. Nuts shall be forged and thread

rolled. (Manufacturing and Machining requirements shall be governed by ASTM A 194/ A194M provisions.)

5.1.6 Materials and fasteners supplied shall conform to the requirements of ASTM A962 / A962M or a

COMPANY-approved equivalent standard. These requirements include test methods, finish, thread dimensions, marking, certification, optional supplementary requirements, etc. In general, bolting shall meet the respective mechanical properties required per the applicable standard, and alternate materials may be used provided they comply with any Design Codes and the properties shown in the tables of the relevant standards

5.1.7 Carbon and low-alloy steel bolts (e.g., ASTM A 193/A 193M Gr. B7 and B7M, ASTM A 320 Gr. L7 and L7M), nuts (e.g., ASTM A 194/A194M, Gr. 2H, 2HM, 7 and 7M), and washers shall be Corrosion protective coated. Refer Section 5.2 for Coating requirements.

5.1.8 Carbon steel flange studs 35 mm (1 3/8 in.) and larger shall be fitted with washers. Where hydraulic stud tensioners are used, it is permissible to utilize only one washer under the side opposite to the hydraulic tensioner mount. Where no washer is installed under the nut, the maintenance procedure shall include a step to dress up the nut-to-flange contact surface (coating damage and/or scoring). Additionally, the following requirements apply:

1. Washers shall conform to ASTM F 436/F 436M or to ASME PCC-

Usage Guidance and Purchase Specification for Through- finish roughness average (Ra) shall be 3.2 micron (125 micro inches) or smoother on both sides. Washers fabricated from AISI 4140 material are acceptable.

2. When coated bolts are required, the washers shall be coated with the same coating.

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NFPS Offshore Compression Complexes Project COMP2

5.1.9

-steel materials such as American Iron and Steel

Institute (AISI) 303 and all free machining grades of stainless steel shall not be permitted.

(CSCC), cold-worked (i.e., strain-hardened) austenitic stainless-steel materials (e.g., AISI 304 and 316) shall not be permitted in offshore environments or locations with direct exposure to brackish water (e.g., subject to deluge) unless physically protected from chloride contact.

5.1.10 The use of AISI 316 and AISI 317 materials is also not acceptable due to the potential for

external CSCC.

5.1.11 Precipitation-hardened martensitic stainless steels, such as 17-4 PH, may suffer deep crevice

and pitting corrosion, so their use as fastener materials offshore is not permitted.

5.1.12 Design of Threads shall be as follows;

1. Stud bolt headed (Machine) bolt and jack screw supplied according to this Specification shall

be full length threaded.

2. Threading shall be in conformity with the following series of Standard ASME B 1.1.

a.

b.

for diameters equal to or greater than 1-1/8 in

3. The machining and surface condition tolerances applicable: to the various threading shall be

in conformity with the following class.

a. Class 2A of standard ASME B.1.1 for stud bolts, Headed (Machine) bolts and jack

screws.

b. Class 2B of standard ASME B 1.1 for nuts.

4. After coating, nuts shall be tapped oversized by an amount equal to the coating thickness of

the bolt threads in order to have a proper nut bolt assembly.

5.1.13 Dimensions shall be in accordance with the following;

1. Bolt dimensions shall be in accordance with ASME B 18.2.1.

2. Nut dimensions shall be in accordance with ASME B18.2.2.

3. Bolt diameter and length shall conform to the dimensions shown on the purchase order.

Diameters shall be in inches and lengths shall be in millimeters.

4. Headed (Machine) bolt length shall be measured from under the head to end of the bolt excluding the chamfered end points. The length of the stud bolt specified is measured excluding end points.

5. The diameter and lengths, thread length etc. of stud bolts, as appropriate, shall comply with

standards ASME B16.5, ASME B16.47 Series A and Series B Flanges.

6. The lengths given on the purchase orders are service lengths that do not include the

dimensions of the end bevels.

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NFPS Offshore Compression Complexes Project COMP2

Carbon and Low-Alloy Steel Bolts, Studs, nuts, and Washers shall be coated before assembly for the purpose of lubricity and corrosion protection as per the following coating method.

Corrosion Resistant Alloy (CRA) (Alloy 625) fasteners do not require a coating, provided the bolting is properly lubricated prior to installation. SS316/316L fasteners shall not be used.

Conventional zinc/nickel plating basecoat with a fluoropolymer topcoat. The zinc/nickel base coating shall be constituted with 11% to 15% nickel and 85% to 89% zinc. Coating Requirements shall be as per below section 5.2.2.

5.2.2.1 Specific Requirements

1. Washers

a) The designated coating system shall be compatible with circular hardened steel washers

per ASME PCC- Through- with the same basecoat and topcoat designated for the nuts and studs.

-approved equivalent. Washers shall be coated

2. Nuts

a) Nuts shall meet ASTM A 194/A 194M.Nuts shall be coated with the same basecoat and

topcoat designated for externally threaded parts by following coating method.

i) Conventional zinc/nickel plating requires overtapping of the nuts to accommodate

the specified coatings and assure that specified nut/stud fit during assembly for delivery and during final assembly.

b) It is the responsibility of the VENDOR to provide nuts that turn freely (manually) on the

corresponding externally threaded part at delivery and to convey with the Nut Supplier any overtapping criteria necessary to ensure free nut run-up following the coating process.

Threa

c) Nut oversize/overtap shall not, unacceptably degrade the strength of the nuts or the holding

capacity of the made-up joint.

3. Double-End Studs

The double-end studs and round stock (unthreaded portion of a bolt) shall be coated simultaneously with the threaded studs of the same diameter and subjected to identical production processing.

4. Stud bolts

The CS and LTCS stud bolts A320 L7/L7M and A193 B7/B7M shall be coated with Zn-Ni Electro- pl basecoat and fluoropolymer topcoat. No coating is required for Inconel bolting F468 UNS N06625.

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NFPS Offshore Compression Complexes Project COMP2

5.2.2.2 General Requirements for Coating Application and Applicator Qualification

1. The coating work shall be performed by Company-approved Applicators. The requisite data submittals include the testing indicated in section 5.2.3. Company may elect to consider pre- existing test reports that are comparable to the test criteria in section 5.2.3.

2. All coated fasteners shall have traceability as to the origin of the fastener and coating.

a) Coatings shall be applied when the surface of the parts being coated is at least 5 °F (3 °C)

warmer than the ambient dew point temperature and the ambient air temperature is between 55 °F (13 °C) and 90 °F (32 °C) unless documented approval of less strict criteria has been promulgated by Coating Manufacturer and approved by Company.

b) The parts shall be visibly dry and at a surface temperature of not more than 125 °F (52 °C)

prior to coating.

5.2.2.3 Coating Procedure for Zinc/Nickel Electroplate

1. Base Coat

The following procedure shall be used for the basecoat:

a) Immediately following the final rinse of the fasteners, zinc/nickel alloy shall be electrodeposited out of an alkaline electrolyte to achieve a minimum of 15 µm of plating thickness. In addition, a trivalent chromate conversion coating post-treatment shall be applied.

b)

show a uniform appearance free from spots, uncoated areas, powder, and white residues. Differences in color or shade in different areas or from piece to piece shall not be considered cause for rejection. Flaking shall be cause for rejection.

c) Following application of the zinc/nickel plating, all treated parts shall be rinsed in tap water

using a multistage process consisting of a minimum of two cycles. The water surface in the final stage shall be free of sheen. The parts shall be visibly dry prior to topcoating and shall be free of visible cracking or flaking. Fasteners manifesting plating flaws shall be reworked or scraped prior to topcoating.

2. Topcoat

The topcoat shall be polymer-based, applied to achieve Dry Film Thickness (DFT) as indicated in Table 5-1. All products shall be applied, baked, and handled in accordance with the roduct Data Sheets. Acceptable topcoat materials shall include the following:

a) Xylan #1424 manufactured by Whitford Corp. of Elverson, PA, U.S.

b) SermaGard #1280 manufactured by Praxair Surface Technologies, Inc. in Indianapolis, IN,

U.S.

c) Powercron 6100HE manufactured by PPG Industries of Pittsburgh, PA, U.S.

Other proprietary coating systems equal in performance and thickness of coats shall be approved by Company based on experience and data submittal.

5.2.2.4

Inspection/Quality Control

1. Coating Applicator shall document and maintain a Quality Control Program (QCP) approved by Coating Manufacturer, which shall be always available for review and approval by Company

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NFPS Offshore Compression Complexes Project COMP2

during working hours. The QCP shall capture the array of coating material batches applied under a given job code.

2. The QCP shall include or reference a Company-approved Coating Application Procedure (CAP) expressly addressing each of the process steps involved in the performance of the coating work. The CAP shall include the stepwise Quality Control (QC) records to be established and maintained throughout the coating work process. The results of the four tests described below shall be made part of the QC records. All QC records pertaining to the coating work shall

and that of Coating Applicator.

3. Surface preparation and other critical process steps, such as mixing, thinning, thickness

measurement, and baking, shall be subject to witnessing by Company.

4. Zinc/Nickel plate thickness shall be measured to confirm that a full 15 µm thickness is achieved before release to the next coating process. To measure the thickness, X-ray spectroscopy (per ASTM B 568) shall be used. The plating thickness measurement shall be witnessed by COMPANY/ EPC CONTRACTOR in accordance with Company-approved procedure prepared by Seller.

5.2.2.5 Production Testing

The following QC testing shall be completed prior to shipping. Failure to comply with the acceptance criteria of any test shall be cause for rejection of the lot. Testing of washer coatings is not required. Methods described in ASTM D 6677 may be modified to allow smaller X-cut to fit part.

1. Coating Cure

rub test).

2. Coating Adhesion

Assess coating adhesion per ASTM D 6677 (smaller X-cut to fit part). The acceptance criterion for coating adhesion is that the coatings shall have a rating > 8.

3. Hardness Testing of Cured Coatings

Perform hardness testing per ASTM D 3363. The acceptance criteria shall be provided in

-approved equivalent.

4. Coating Thickness

Determine the DFT of each coat and the overall DFT achieved on the sample parts.

F 1941/F

a) DFT assessment of externally threaded surfaces shall be made visually by means of

microscopic examination of resin-mounted, sectioned, polished, and natal-etched fasteners. The mounting resin shall bond perfectly when sectioned and not lift from the coating. The mounting resin color shall allow clear differentiation between the potting and the coatings. Magnification shall be 50x to 100x. An electronic file-type photomicrograph shall document each examination. Each photomicrograph shall contain a scale in µm.

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Table 5- 1: Basecoat/Topcoat Minimum Thickness Requirements in µm

Coating

Basecoat ( m)

Topcoat ( m)

Total min-max

Zinc/nickel plating + Xylan 1424

Zinc/nickel plating + SermaGard 1280

Zinc/nickel plating + Powercron 643 or XP

15 µm

15 µm

15 µm

25 µm

25 µm

25 µm

40 µm

40 µm

40 µm

Notes:

(1) While no maximum limits are imposed, the maximum as-applied thickness will impact the extent of overtap required. The ultimate criterion with regard to maximum thickness is that nuts turn freely during assembly for shipping

(2) To achieve the specified DFT, more than one layer may be required. The process needed

to achieve the stipulated DFT differs for and depends on the particular material to be applied.

b) Externally threaded fasteners (studs and bolts) shall be ground or milled as necessary, to achieve longitudinal sectioning over a length of at least 0.8 in. (2 cm). The temperature shall not exceed 350 °F (177 °C) during the sectioning process. Sectioning shall confirm that the thickness of each of the two coatings comprising the system and the combined two coats meets or exceeds the minimum thickness indicated in Table 5- 1.

c) Nuts shall not require sectioning. DFT shall be measured magnetically on external surfaces using a Type 1B pencil pull-off gage calibrated in accordance with SSPC PA 2.

5.2.2.6 Sample Size and Frequency for Testing

1. Testing shall be performed per the guidance presented in ASTM F 1470, Sections 6

a BSI BS EN ISO 9001 quality program, then Company may consider an alternative sampling process for approval. The sample size shall be differentiated according to the following:

a) The type of fastener (e.g., studs and double-end studs [combined] and nuts).

b) The diameter of the fastener.

Table 5- 2: Sample Surfaces to be Examined During Testing

Test

Fastener

Surface Examined

#1 Cure

Studs

End #1(1)

Bolts, double-end studs, round stock

Unthreaded surface

Hex nuts

Flute face (2)

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Test

Fastener

Surface Examined

#2 Adhesion

Studs

End #2

Bolts, double-end studs, round stock

Unthreaded surfaces (portion on the opposite side of Test #1 above)

#3 Thickness

Hex nuts

Studs

Flute face

Longitudinal cross-section

Bolts, double-end studs, round stock

Longitudinal cross-section at no thread portion

Hex nuts

Longitudinal cross-section

Notes:

(1) The length of the rub stroke shall be reduced from the 6 in. x 1 in. (150 mm x 25 mm)

area indicated in ASTM D 5402. On end sections and nut flutes, the rub will need to be modified to a 90-degree rotation rather than a linear stroke.

(2) A flute face is the flat or outer face.

2. The surface of each sample item to be tested shall be as shown in Table 5-2. Results of the

examinations shall meet visual and dimensional thickness requirements.

5.2.2.7 Packaging

1. All externally threaded fasteners shall be prepared for shipping by assembly, with matching pairs of coated nuts. Washers may be packaged separately. Nuts shall be run-up onto the exterior threaded part to the extent that a minimum of two threads protrude.

2. Each assembly shall be protected from damage during shipment.

3. Assemblies shall be cushioned and stabilized against motion within the box or drum by means

of plastic bubble wrap, dividers, or cellular plastic packing.

The fastener coating process for use on low-alloy ferritic steel bolting shall be qualified by salt spray testing per ASTM B 117. The testing applies to coatings that are supplied by applicators not currently on the Qualified Manufacturers List.

5.2.3.1 Parts and Materials

1. Coating Applicator shall prepare fastener test specimens that represent the coating system(s)

that is (are) to be applied.

2. For each different coating system to be tested, the salt spray test shall be carried out on two

sets of four coated ASTM A 193/A 193M Grade B7, B7M and ASTM A 320 Grade L7, L7M test studs, each with a coated pair of ASTM A 194/A 194M Grade 2H, 2HM, 7 and 7M nuts and coated or galvanized ASME PCC-1 washers.

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3. Except where zinc/nickel-coated washers are supplied, all parts of each set of fasteners shall

be coated as per the requirements provided in Section 5.2.2.

4. Coating Applicator shall notify COMPANY/ EPC CONTRACTOR Representative of the schedule date for applying the coating systems to the fastener test specimens. Notification of the schedule date will enable COMPANY / EPC CONTRACTOR Representative to witness application of the coating systems to the test fasteners.

5. The test studs shall be any diameter from ½ in. to 1½ in. (12.7 mm to 38.1 mm). Stud length

shall be as required to satisfy the flange size/geometry described in Section 5.2.3.2. The thread projection shall not be large enough as to interfere with the tightening socket described in Section 5.2.3.3.

6. The coated fasteners to be tested shall be selected by the test facility and shall have a range of

fits as judged by the ability to turn the nuts by hand.

5.2.3.2 Test Flanges

1. Each of the two groups of four test studs, nuts, and washers shall be fitted to separate flange assemblies comprised of a pair of raised-faced Fiber-Reinforced Plastic (FRP) piping flanges, ASME B16.5 Class 150#. Fasteners shall be arrayed symmetrically around the bolt circle.

2. FRP flanges shall be fabricated from material complying with API SPEC 15LR. Each flange

pair shall bear a unique, indelible Inside Diameter (ID). A gasket shall be provided that conforms to the requirements of ASME B16.21. The gasket material shall not contain metallic fillers.

3. The flange thickness shall be selected to ensure that, when snug, and accounting for the gap

due to the raised faces and gasket, nuts are threaded onto the stud at least one nut width across the flats (i.e., so that the thread stick-out is at least one nut in width).

5.2.3.3 Nut Tightening

1. The nuts for one of the two flange pairs shall be tightened such that the net stud elongation is as required to produce stress equal to 105 ksi (724 Mpa), the 0.2% offset yield per ASTM A

2. The nuts for the second flange pair shall be finger-tight only.

3. Stud tensioning shall be by means of a manual socket wrench.

5.2.3.4 Salt Fog Exposure

1. The pair of flanges shall be placed within the salt spray cabinet. One flange shall be oriented vertically, and the other flange shall be oriented horizontally. The test report shall note, by reference to the flange ID, how a particular flange assembly was oriented.

2. After 3,000 hours of exposure, the extent of rust on two or more coated nuts or studs shall not

be inferior to Rust Grade 5 per ASTM D610 to constitute a passing exposure test.

3. It shall be verified that the nuts can be removed from the studs with a hand torque. Manual

loosening using a crescent wrench not longer than eight times the nut width (across the flats) may be used for the first complete turn.

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4. Flanges/Fasteners shall be cleaned per ASTM B

and the results shall be in accordance with ASTM D5065, except that with respect to the adhesion assessment referenced in ASTM D

D6677.

1. Vendor to submit an ITP for EPCIC CONTRACTOR / COMPANY approval.

2. All fasteners shall be tested in accordance with applicable ASTM, ASME and other references

specifications, code or standards and purchase order.

3. Material to be used in sour service shall be additionally tested as specified in NACE MR0175

standard.

4. Where inspection and tests are required on randomly selected items, manufacturer shall make

randomly the items to con selected items from lot and presented for inspection or testing will not be accepted.

-party inspector to select

5. Vendor is responsible for informing the EPCIC CONTRACTOR / COMPANY about the availability

of goods for inspection and testing.

Hardness testing shall be performed in accordance with either Specification ASTM A962 / A962M or with Test Methods F606.

All bolts shall be impact tested as per below Table 5-3.

Table 5- 3: Impact Testing

Grade

B7 / 2H

B7M / 2HM

L7 / 7

L7M / 7M

A453 Gr. 660

Minimum Impact Value Required for Average of Each Set of Three Specimens, ft·lbf [J]

Minimum Impact Value Permitted for One Specimen Only of a Set, ft·lbf [J]

Test

Temperature

20 [27]

20 [27]

20 [27]

20 [27]

40 [54]

15 [20]

15 [20]

15 [20]

15 [20]

30 [41]

-29

-29

-101

-46

-29

1. Visual inspection shall be supplemented by a comparison of markings on the bolts and/or nuts.

2. All materials shall be inspected and be completed with all necessary documentation.

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3. Inspection and witnessing during various stages of manufacture, testing and final inspection shall

form a part of scope of purchase order. Supplier shall provide free access to supplier / sub-supplier

-party inspection agency to carry out inspections, test witnessing and final inspection as per agreed hold points of Inspection and Test Plan.

6.1.1

In general, the requirements specified in this document shall be applicable, unless specified otherwise.

6.1.2 All manufacturing and testing procedures, mill certificates, qualification certificates shall be

submitted for purchaser review and approval prior to start of work.

6.1.3 Supplier, sub-suppliers, and manufacturer of material shall be qualified as per approved vendor

list.

6.1.4 The gasket and any associated sealing elements shall be made of homogenous design without

butt weld or splices.

6.1.5 Flexible graphite for sheet and spiral-wound gaskets shall have a minimum purity of 98%.

Leachable chlorides from the finished gasket shall not exceed 50 ppm.

Table 6- 1: Inner Ring Requirements for Graphite-Filled Spiral-Wound Gaskets

Class

Applicability

150 through 600

An inner retaining ring shall be provided for spiral-wound gaskets

except as follows:

Where threaded or slip-on flanges are used.

In applications where the inner ring may project into the pipe bore. For example, certain Long Weld Neck (LWN) flanges.

Where other means to prevent inward buckling of the spiral

windings are provided and approved by COMPANY.

900 through 2500

Use of RTJ gaskets is required.

6.1.6 Gaskets for raised face (RF) flanges shall be spiral wound with stainless steel windings and

flexible graphite filler material in accordance with ASME B16.20. Flexible graphite sheet gaskets, in accordance with ASME B16.21, may be used in Class 150 flanged joints.

6.1.7 Centering ring and inner ring requirements shall comply with ASME B16.20.

6.1.8

Inner rings shall also be specified for graphite-filled spiral-wound gaskets per the criteria of Table 6-1 as a minimum, the inner ring material shall be of the same nominal chemical composition as the spiral-wound material.

6.1.9 When flexible graphite sheet gaskets are used, the graphite shall include a metallic

reinforcement they shall consist of one of the following:

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a) Flexible graphite, adhesively bonded to both sides of a flat, thin (0.05 mm [0.002 in.]) sheet

of Type 316 stainless steel (Grafoil GHR or COMPANY-approved equivalent).

b) Flexible graphite, mechanically bonded to a Type 316 stainless steel tanged insert, 0.13 mm

(0.005 in.) thick (Grafoil GHE or COMPANY-approved equivalent).

c) Corrugated 316 stainless steel metal ring (0.8 mm [0.031 in.] thk.) encapsulated with flexible

graphite (M&P Graphonic or COMPANY-approved equivalent).

6.1.10 Gaskets for ASME B16.5 and ASME B16.47 RTJs shall be oval, Type R in accordance with

ASME B16.20, including maximum hardness limits (see Table 6-2 of this document). As required by ASME B16.20, the ring joint material shall be of a lesser hardness than that of the mating flange. Soft iron and low carbon steel RTJ gaskets shall be protected with electroplated zinc.

6.1.11 The dimensions of non-metallic flat gaskets shall be in accordance with to ASME B16.21 and

to match the relevant flange standard specified in the purchase requisition.

6.1.12 Non-

connections with metallic pipe.

6.1.13 When metallic flanges are bolted to non-metallic flanges, both shall be flat faced unless spacer

rings and full-face non-asbestos sheet gaskets compatible to process fluid are used.

6.1.14

annealed.

6.1.15 Ring joint gasket materials shall be selected in accordance with this Specification. They shall

be suitable for the chemical environment, temperature, and pressure in which they will operate. The minimum sour service suitable materials:

a) For Carbon Steel lines (Dry Gas Export), gasket will be based on 316L SS windings with

graphite filler.

b) For Carbon Steel lines with Alloy 625 Clad and Alloy 625 lines, gasket will be based on Alloy

625 (UNS N06625).

6.1.16 The maximum hardness of ring joint gaskets shall be:

Soft iron (Armco): 90 HB

Stainless Steel: 130 HB

Super Duplex: 170 HB

Inconel 625: 210 HB

6.1.17 All Gaskets specified for sour service shall meet the requirements of NACE MR0175/ ISO

6.1.18 Gaskets that are

6.1.19

equivalent.

rubber gaskets shall be EPDM or

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6.1.20 All other non-metallic gaskets shall be 3.2mm thick.

6.1.21 Spiral wound gaskets shall have an uncompressed thickness of 4.5mm (compressed thickness

3.2mm) unless otherwise specified in purchase requisition.

6.1.22 The material for other flat gaskets shall be as per the purchase requisition. In general material

used for flat gaskets shall be compressed fibre (Non-Asbestos) or flexible graphite. Compressed fiber gaskets shall be supplied as oil resistant and have a chloride content of less than 100 ppm.

All material used shall be new and not recycled.

Surface finish of metallic gasket shall be as per ASME B16.20.

6.3.1

Vendor to submit an ITP for Saipem S.p.A. approval.

6.3.2

Visual inspection and dimension inspection on random samples will be performed for each lot.

6.3.3

All materials shall be inspected and be completed with all necessary documentation.

6.3.4

All gaskets shall be tested in accordance with applicable ASTM, ASME and other references specifications, code or standards and purchase order.

6.3.5 Random sampling will be taken for hardness testing as per approved ITP.

6.3.6 Where inspection and tests are required on randomly selected items, manufacturer shall make

select randomly the items to conduct inspect or test as required by purchase order. -selected items from lot and presented for inspection or testing will not be

-party inspector to

accepted.

6.3.7

Inspection and witnessing during various stages of manufacture, testing and final inspection shall form a part of scope of purchase order. Vendor shall provide free access to vendor / sub-

to carry out inspections, test witnessing and final inspection as per agreed hold points of Inspection and Test Plan.

-party inspection agency

7.1.1

Positive Material Identification (PMI) shall be conducted for all SS / CRA alloy piping items as per the project specification included in the Inquiry / Purchase requisition.

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7.1.2 Positive material identification (PMI) shall be carried out as per Specification for Positive Materials Identification (PMI), Doc. No.: 200-20-PI-SPC-00019. PMI instrument used shall have latest calibration and shall be approved by purchaser

7.1.3 Alloy and CRA fasteners (bolts and nuts) for general service (Non-Nace Services) applications

require a random PMI inspection: A random inspection sample shall be as per below Table 7-1.

Table 7- 1: Sample Size

Lot Size

Sample Size

5 or Less

100%

6 200

5 pieces or 5% (Whichever is Greater)

200

10 pieces or 3% (Whichever is Greater)

8.1.1 All studs, bolts, and nuts shall be permanently marked as defined in the applicable fastener

materials standard, (e.g., ASTM A 962 / A 962M). Only rounded face, low stress stamp techniques shall be applied. The following information shall be included:

2. Steel grade.

3. Property class.

8.1.2 Marking and tagging requirements for the gasket shall be marked with size, type rating standard and color coded and shall be in accordance with ASME B16.20 and ASME 16.21 respectively. In addition, the purchase order number and purchase order item number shall be marked on each box or package.

8.1.3 The marking shall be applied so as not to harmfully distort the gasket or affect the integrity of the

seal.

8.1.4

No.:200-20-PI-SPC-00017, for additional requirements.

9.1.1 All material certifications shall be in accordance with the EN 10204 Type 3.2 for Alloy 625 and

Type 3.1 for other material. Material certificate shall show the chemical composition, mechanical test records, heat treatment records and any other records of supplementary tests specified in purchase order.

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10.1 Material handling, packaging, preservation, and storage shall be as per project specification and

purchase order requirements.

10.2 Material handling shall ensure to prevent or minimize the possibility of contamination.

10.3 Bolting items shall be supplied with suitable rust preventive.

10.4 Use of bare steel hooks, chains or lifting forks without the use of protective insulating material is

not permitted.

10.5 Preservation and protection of components shall be as per project specifications and

requirements of ASTM A700.

10.6 Wooden boxes shall be fumigated and certified to requirements of ISPM 15.

10.7 Each gasket shall be free from sharp edges, burrs, organic substances (e.g. grease, oil, lubricants, sealants and preservatives), rust dirt or any other foreign particulate matter. The filler material shall be free from blister, crack or other surface imperfections e.g. porosity, voids, inclusions or other defects which could impair satisfactory performance.

10.8 Ring joint gaskets other than those made of stainless steel shall be covered by grease

impregnated protecting strips.

11.1.1 Vendor shall certify that all components are in compliance with the relevant ASTM

specifications, codes and project specification referred here-in and enclosed with purchase order.

11.1.2 List below gives the minimum required supplier documents. However, supplier shall submit all

the documents / reports as a part of supplier documentation as per purchase order. All documents / certificates shall be signed by responsible person of supplier.

Mill Certificate /CMTR;

Mechanical Test Records;

Impact Test Records;

Hardness Test Records;

PMI test Records.

Appendix 1 Bolting Selection Tables

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Table A: Offshore, Non-sour (Hydrocarbon) Service

Design Metal Temperature

Minimum Stud Yield Strength (1)

ºC

ºF

ksi (MPa)

Coating Required

95 (654)

96 (665)

105 (723)

105 (723)

95 (650)

Yes

No

Yes

Yes

Yes

65 (450)

No

93

80 (551)

No

Studs

Nuts (2)

Standard

Grade

Standard

Grade

ASTM A 193/A 193M

ASTM A 193/A 193M

ASTM A 320/A 320M

ASTM A 320/A 320M

BSI BS EN 10269

ASTM A 276/A 276M & ASTM A 479/A 479M

ASTM A 276/A 276M & ASTM A 479/A 479M

B7

B8MLCuN

L7

L43

42CrMo4

UNS S31803

UNS S32750

ASTM A 194/A 194M

ASTM A 194/A 194M

ASTM A 194/A 194M

ASTM A 194/A 194M

BSI BS EN 10269

ASTM A 276/A 276M & ASTM A 479/A 479M

ASTM A 276/A 276M & ASTM A 479/A 479M

2H

8MLCuN

7L

7L

42CrMo4

UNS S31803

UNS S 32750

96 (665)

No

ASTM A 193/A 193M

B8MLCuN

ASTM A 194/A 194M

8MLCuN

120 (827) or 140 (964)

No

API STD 6ACRA

Alloy 718

API STD 6ACRA

Alloy 718

110 (758)

No

API STD 6ACRA

Alloy 925

API STD 6ACRA

Alloy 925

30 (207)

No

ASTM F 468 Monel 400 ASTM F 467 Monel 400

85 (586) Gr.1 125 (861) Gr.2 150 (1033) Gr.3 45 (310) Gr.4

No

ASTM F 468

Alloy 686

ASTM F 467

Alloy 686

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NFPS Offshore Compression Complexes Project COMP2

0 to 300

32 to 572

39 (270)

No

ASTM F 468

Titanium

ASTM F 467

Titanium

65 (450)

No

ASTM F 468 Alloy 625 ASTM F 467 Alloy 625

160 (1103)

No

ASTM B 637

C22HS, cold worked

ASTM F 468 Alloy 686

Notes for Table A:

(1) Replace “yield strength” with “proof strength” if using ISO or EN standards.

(2) Alternate nut choices may be acceptable but should be reviewed with Company Materials

SME.

[A] All fasteners listed in this table shall conform to the requirements of ASTM A 962/A 962M or Company-approved equivalent. These requirements include test methods, finish, thread dimensions, certification, etc. Dimensions and thread pitch shall be in accordance with ASME B1.1 and ASME B1.13M.

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Table B: Onshore, Sour Service

Design Metal Temperature

Minimum Stud Yield Strength (1)

Coating Required

Studs

Nuts (2)

ºC

ºF

ksi (MPa)

Standard

Grade

HRC (HB) Maximum

Standard

Grade

HRC (HB) Maximum

Note 4

Yes

Note 4

Yes

Note 4

Yes

ASTM A 193/A 193M

ASTM A 320/A 320M

BSI BS EN 10269

B7M

22 (235)

L7M

22 (235)

42CrMo4 22 (235)

ASTM A 194/A 194M

ASTM A 194/A 194M

BSI BS EN 10269

2HM

22 (235)

7ML

22 (235)

42CrMo4 22 (235)

200

30 (210)

No

ASTM A 193/A 193M

B8MLCuN, Class 1

Per standard

ASTM A 194/A 194M

8MLCuN

Per standard

65 (450)

No

80 (551)

No

80 (551)

No

120 (827) or 140 (964)

No

110 (758)

No

200

30 (207)

No

ASTM A 276/A 276M & ASTM A 479/A 479M

ASTM A 276/A 276M & ASTM A 479/A 479M

ASTM A 276/A 276M & ASTM A 479/A 479M

UNS S31803

UNS S32760

UNS S32750

30

30

35

Alloy 718

40

Alloy 925

38

API STD 6ACRA

API STD 6ACRA

ASTM F 468

ASTM A 276/A 276M & ASTM A 479/A 479M

ASTM A 276/A 276M & ASTM A 479/A 479M

ASTM A 276/A 276M & ASTM A 479/A 479M

API STD 6ACRA

API STD 6ACRA

UNS S31803

UNS S32760

UNS S32750

30

30

35

Alloy 718

40

Alloy 925

38

25

Monel 400

25

ASTM F 468 Monel 400

200

85 (586) Gr.1 125 (861) Gr.2 150 (1033) Gr.3 45 (310) Gr.4

No

ASTM F 468

Alloy 686

40

ASTM F 468 Alloy 686

40

0 to 300 32 to 572 39 (270)

No

200

65 (450)

No

ASTM F 468

ASTM B 637

Alloy 625

35

ASTM F 467 Alloy 625

C22HS, cold worked

42

ASTM F 468 Alloy 686

35

35

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Notes for Table B:

(1)

(2)

(3)

Replace “yield strength” with “proof strength” if using ISO or EN standards.

Alternate nut choices may be acceptable but should be reviewed with Company Materials SME.

The minimum yield strength will be determined by the hardness. For sour service, the hardness is the controlling parameter for carbon and low-alloy steels.

[A] All fasteners listed in this table shall conform to the requirements of ASTM A 962/A 962M or Company-approved equivalent. These requirements include test methods, finish, thread dimensions, certification, etc. Dimensions and thread pitch shall be in accordance with ASME B1.1 and ASME B1.13M.

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Project: Q-21699 - Saipem COMP2 Folder: Material, Painting, Insulation