November Attention: Users of API Specification 6A, 17th Edition

Transcription

1 November 1999 Attention: Users of API Specification 6A, 17th Edition This edition of API Specification 6A contains material from the Errata issued December 1996 and balloted and approved changes through It was decided to publish API Spec 6A in this manner because the volume of balloted changes would produce a large supplement that would cause a burden on users of the specification when trying to determine exact changes to the standard. Balloted changes are marked with bars in the margin. Changes resulting from the Errata have been incorporated, without change bar markings, into the standard. An equal opportunity employer

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3 Specification for Wellhead and Christmas Tree Equipment API SPECIFICATION 6A SEVENTEENTH EDITION, NOVEMBER 1999 Effective Date, May 31, 2000 Contains Errata and Supplement 1 Material

4 API ENVIRONMENTAL, HEALTH AND SAFETY MISSION AND GUIDING PRINCIPLES The members of the American Petroleum Institute are dedicated to continuous efforts to improve the compatibility of our operations with the environment while economically developing energy resources and supplying high quality products and services to consumers. We recognize our responsibility to work with the public, the government, and others to develop and to use natural resources in an environmentally sound manner while protecting the health and safety of our employees and the public. To meet these responsibilities, API members pledge to manage our businesses according to the following principles using sound science to prioritize risks and to implement cost-effective management practices: To recognize and to respond to community concerns about our raw materials, products and operations. To operate our plants and facilities, and to handle our raw materials and products in a manner that protects the environment, and the safety and health of our employees and the public. To make safety, health and environmental considerations a priority in our planning, and our development of new products and processes. To advise promptly, appropriate officials, employees, customers and the public of information on significant industry-related safety, health and environmental hazards, and to recommend protective measures. To counsel customers, transporters and others in the safe use, transportation and disposal of our raw materials, products and waste materials. To economically develop and produce natural resources and to conserve those resources by using energy efficiently. To extend knowledge by conducting or supporting research on the safety, health and environmental effects of our raw materials, products, processes and waste materials. To commit to reduce overall emissions and waste generation. To work with others to resolve problems created by handling and disposal of hazardous substances from our operations. To participate with government and others in creating responsible laws, regulations and standards to safeguard the community, workplace and environment. To promote these principles and practices by sharing experiences and offering assistance to others who produce, handle, use, transport or dispose of similar raw materials, petroleum products and wastes.

5 Specification for Wellhead and Christmas Tree Equipment Upstream Segment API SPECIFICATION 6A SEVENTEENTH EDITION, NOVEMBER 1999 Effective Date, May 31, 2000 Contains Errata and Supplement 1 Material

6 SPECIAL NOTES API publications necessarily address problems of a general nature. With respect to particular circumstances, local, state, and federal laws and regulations should be reviewed. API is not undertaking to meet the duties of employers, manufacturers, or suppliers to warn and properly train and equip their employees, and others exposed, concerning health and safety risks and precautions, nor undertaking their obligations under local, state, or federal laws. Information concerning safety and health risks and proper precautions with respect to particular materials and conditions should be obtained from the employer, the manufacturer or supplier of that material, or the material safety data sheet. Nothing contained in any API publication is to be construed as granting any right, by implication or otherwise, for the manufacture, sale, or use of any method, apparatus, or product covered by letters patent. Neither should anything contained in the publication be construed as insuring anyone against liability for infringement of letters patent. Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at least every five years. Sometimes a one-time extension of up to two years will be added to this review cycle. This publication will no longer be in effect five years after its publication date as an operative API standard or, where an extension has been granted, upon republication. Status of the publication can be ascertained from the API Upstream Segment [telephone (202) ]. A catalog of API publications and materials is published annually and updated quarterly by API, 1220 L Street, N.W., Washington, D.C This document was produced under API standardization procedures that ensure appropriate notification and participation in the developmental process and is designated as an API standard. Questions concerning the interpretation of the content of this standard or comments and questions concerning the procedures under which this standard was developed should be directed in writing to the general manager of the Upstream Segment, American Petroleum Institute, 1220 L Street, N.W., Washington, D.C Requests for permission to reproduce or translate all or any part of the material published herein should also be addressed to the general manager. API standards are published to facilitate the broad availability of proven, sound engineering and operating practices. These standards are not intended to obviate the need for applying sound engineering judgment regarding when and where these standards should be utilized. The formulation and publication of API standards is not intended in any way to inhibit anyone from using any other practices. Any manufacturer marking equipment or materials in conformance with the marking requirements of an API standard is solely responsible for complying with all the applicable requirements of that standard. API does not represent, warrant, or guarantee that such products do in fact conform to the applicable API standard. All rights reserved. No part of this work may be reproduced, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission from the publisher. Contact the Publisher, API Publishing Services, 1220 L Street, N.W., Washington, D.C Copyright 1999 American Petroleum Institute

7 FOREWORD This Specification for Wellhead and Christmas Tree Equipment was formulated by the API Exploration and Production Department Subcommittee on Valves and Wellhead Equipment. This Specification provides for a family of equipment for use at the wellhead in the production of oil and gas. Other publications formulated by this subcommittee are: API 6AF, Technical Report on Capabilities of API Flanges Under Combinations of Load. Technical Report 6AF1, Technical Report on Temperature Derating of API Flanges Under Combinations of Loading. Technical Report 6AF2, Technical Report on Capabilities of API Integral Flanges Under Combination of Loading. API6AM, Material Toughness. RP 6AR, Recommended Practice for Repair and Remanufacture of Wellhead and Christmas Tree Equipment. Spec 6D, Specification for Pipeline Valves (Gate, Plug, Ball, and Check Valves). Spec 6FA, API Specification for Fire Test for Valves. Spec 6FB, API Specification for Fire Test for End Connections. Spec 6FC, API Specification for Fire Test for Valves with Automatic Backseats. Spec 6FD, Specification for Fire Test for Check Valves. Technical Report 6F1, Performance of API and ANSI End Connections in a Fire Test According to API Spec 6FA. Technical Report 6F2, Fire Resistance Improvements for API Flanges. Spec 6H, Specification for End Closures, Connectors, and Swivels. Bull 6J, Bulletin on Testing of Oilfield Elastomers (A Tutorial). Bull 6RS, Bulletin on Referenced Standards for Committee 6, Standardization of Valves and Wellhead Equipment. This standard shall become effective on the date printed on the cover but may be used voluntarily from the date of distribution. API publications may be used by anyone desiring to do so. Every effort has been made by the Institute to assure the accuracy and reliability of the data contained in them; however, the Institute makes no representation, warranty, or guarantee in connection with this publication and hereby expressly disclaims any liability or responsibility for loss or damage resulting from its use or for the violation of any federal, state, or municipal regulation with which this publication may conflict. Suggested revisions are invited and should be submitted to the general manager of the Upstream Segment, American Petroleum Institute, 1220 L Street, N.W., Washington, D.C Attention Users: Portions of this publication have been changed from the previous edition and supplements. Some changes are significant, while others reflect minor editorial adjustments. The locations of substantive changes have been marked with bar notations in the margins, as shown to the left of this paragraph. The bar notations are provided as an aid to users, and API makes no warranty as to their completeness. iii

8 IMPORTANT INFORMATION CONCERNING USE OF ASBESTOS OR ALTERNATIVE MATERIALS Asbestos is specified or referenced for certain components of the equipment described in some API standards. It has been of extreme usefulness in minimizing fire hazards associated with petroleum processing. It has also been a universal sealing material, compatible with most refining fluid services. Certain serious adverse health effects are associated with asbestos, among them the serious and often fatal diseases of lung cancer, asbestosis, and mesothelioma (a cancer of the chest and abdominal linings). The degree of exposure to asbestos varies with the product and the work practices involved. Consult the most recent edition of the Occupational Safety and Health Administration (OSHA), U.S. Department of Labor, Occupational Safety and Health Standard for Asbestos, Tremolite, Anthophyllite, and Actinolite, 29 Code of Federal Regulations Section ; the U.S. Environmental Protection Agency, National Emission Standard for Asbestos, 40 Code of Federal Regulations Sections through ; and the U.S. Environmental Protection Agency (EPA) rule on labeling requirements and phased banning of asbestos products (Sections ). There are currently in use and under development a number of substitute materials to replace asbestos in certain applications. Manufacturers and users are encouraged to develop and use effective substitute materials that can meet the specifications for, and operating requirements of, the equipment to which they would apply. SAFETY AND HEALTH INFORMATION WITH RESPECT TO PARTICULAR PRODUCTS OR MATERIALS CAN BE OBTAINED FROM THE EMPLOYER, THE MANUFACTURER OR SUPPLIER OF THAT PRODUCT OR MATERIAL, OR THE MATERIAL SAFETY DATA SHEET. iv

9 CONTENTS Page 1 SCOPE Purpose Applications Product Specification Levels (PSL) Interchangeability Appendices REFERENCES General Reference Standards Requirements Equivalent Standards ABBREVIATIONS/DEFINITIONS Abbreviations Definitions DESIGN AND PERFORMANCE GENERAL REQUIREMENTS Performance Requirements General Service Conditions Design Methods Miscellaneous Design Information Design Documentation Design Review Design Verification MATERIALS GENERAL REQUIREMENTS General Written Specifications Mandrel Tubing and Casing Hangers Bodies, Bonnets, and End and Outlet Connections Ring Gaskets Test Coupons Qualification Test Coupons Heat Treating Equipment Qualification Material Qualification WELDING GENERAL REQUIREMENTS General Nonpressure-Containing Weldments Other Than Weld Overlays (PSL 1 3) Pressure-Containing Fabrication Weldments for Bodies, Bonnets, and End and Outlet Connections Pressure-Containing Repair Weldments for Bodies, Bonnets, and End and Outlet Connections Weld Overlay for Corrosion Resistance and/or Hard Facing and Other Material Surface Property Controls v

10 Page 7 QUALITY CONTROL Scope Quality Control Records Measuring and Testing Equipment Quality Control Personnel Qualifications Quality Control Requirements Quality Control Records Requirements EQUIPMENT MARKING Marking Requirements Wellhead Equipment Connectors and Fittings Casing and Tubing Hangers Valves and Chokes Loose Connectors Other Equipment Studs and Nuts Christmas Trees STORING AND SHIPPING Draining after Testing Rust Prevention Sealing Surface Protection Assembly and Maintenance Instructions Ring Gaskets Nonmetallic Age Control EQUIPMENT SPECIFIC REQUIREMENTS API Flanged End and Outlet Connections API Threaded End and Outlet Connections Studs and Nuts Ring Gaskets Valves Casing and Tubing Heads Casing and Tubing Hangers Tubing Head Adapters Chokes Tees and Crosses Test and Gage Connections for 15,000 and 20,000 psi (103.5 and MPa) Equipment Fluid Sampling Devices Christmas Trees Crossover Connectors Adapter and Spacer Spools Actuators Lock Screws, Alignment Pins, and Retainer Screw Packing Mechanisms Other End Connectors Top Connectors Surface and Underwater Safety Valves and Actuators for Offshore Service vi

11 11 REPAIR AND REMANUFACTURE REQUIREMENTS General Repair/Remanufacture Levels (RL) Design Material for Replacement Parts Repair Remanufacturing Quality Control Equipment Marking APPENDIX A PURCHASING GUIDELINES A-1 APPENDIX B METRIC TABLES AND DATA FOR API SPEC 6A B-1 APPENDIX C METHOD OF CALCULATING STUD BOLT LENGTHS FOR TYPE 6B AND 6BX FLANGES C-1 APPENDIX D RECOMMENDED FLANGE BOLT TORQUE D-1 APPENDIX E RECOMMENDED WELD GROOVE DESIGNS E-1 APPENDIX F PERFORMANCE VERIFICATION PROCEDURES F-1 APPENDIX G DESIGN AND RATING OF EQUIPMENT FOR ELEVATED TEMPERATURES G-1 APPENDIX H RECOMMENDED PRACTICE FOR HEAT TREATING EQUIPMENT QUALIFICATION H-1 APPENDIX I REVISED PIPE TOLERANCES I-1 APPENDIX J SCOPE AND USE OF API 6A vs. API 6AR REPAIR AND REMANUFACTURE STANDARDS FOR WELLHEAD AND CHRISTMAS TREE EQUIPMENT J-1 APPENDIX K USE OF THE API MONOGRAM BY API LICENSEES K-1 APPENDIX L FAILURE REPORT FOR SURFACE SAFETY VALVES (SSV) AND UNDERWATER SAFETY VALVES (USV) MINIMUM DATA L-1 Figures 1.1 Typical Wellhead Assembly Nomenclature Typical Christmas Tree Nomenclature Equivalent Round Models Welding Procedure Qualification Vickers Hardness Test Locations (PSL 3) Welding Procedure Qualification Rockwell Hardness Test Locations (PSL 3) Hardness Test Locations Ring Gasket Hardness Test Location Type 6B Blind Flanges Weld End Preparation for Type 6B and 6BX Weld Neck Flanges API Pipe Thread Counterbore Gaging Practice for API Line-Pipe Casing and Tubing Internal Threads, Handtight Assembly Application of Working Plug Gage to Valve and Fitting API Threads Having Internal Recess Clearance Application of Working Plug Gage to Valve and Fitting API Threads Having Thread Clearance Regular, Swing-Check Valve Full-Opening, Swing-Check Valve Regular, Lift-Check Valve Typical Single Plate Wafer-Type Check Valve Long Pattern Typical Single Plate Wafer-Type Check Valve Short Pattern Typical Dual Plate Wafer-Type Check Valve Long Pattern vii Page

12 10.13 Typical Reduced-Opening Vertical Bore Adjustable Choke Positive Choke API Flanged Cross API Flanged Tee API Flange Studded Cross API Flanged Studded Tee Test and Gage Connections (15,000 and 200,000 psi) Crossover Spool with Restricted Area Packoff Supported by Lower Head Crossover Spool with Restricted Area Packoffs Supported by Upper Spool Crossover Flange Multistage Crossover Spool A1 Typical Wellhead and Tree Configuration 5,000 psi (34.5 MPa) Rated Working Pressure A-12 A2 Typical Wellhead and Tree Configuration 10,000 psi (69.0 MPa) Rated A3 Page Working Pressure A-13 Recommended Minimum PSL for Primary Parts of Wellheads and Christmas Tree Equipment A-14 C1 Flange Makeup and Stud Length C-1 F1.1 Testing Procedure F-4 F2.1 Load Cycle Testing for Hangers F-16 F2.2 Group 2 and 3 Hangers F-16 F2.3 Group 3 Hangers with Bottom Casing Packoff F-16 F2.4 Pressure/Temperature Cycles for Group 3 Slip and Mandrel Hangers Without Bottom Cashing Packoff F-17 F2.5 Pressure/Temperature Cycles for Group 3 Slip and Mandrel Hangers Bottom Casing Packoff Tested Separately F-17 F2.6 Pressure/Temperature Cycles for Group 3 Slip and Mandrel Hangers With Bottom Casing Packoff Tested Concurrently F-18 F2.7 Pressure/Temperature Cycles for Group 3 Slip and Mandrel Hangers With Bottom Casing Packoff Tested Concurrently F-18 H1 Thermocouple Locations H-2 Tables 4.1 Pressure Ratings for Internal API Threaded End or Outlet Connections Material Requirements Temperature Ratings Fraction to Decimal Conversion Chart API Standard Material Property Requirements for Bodies, Bonnets, and End and Outlet Connections API Material Applications for Bodies, Bonnets, and End and Outlet Connections Charpy V-Notch Impact Requirements Adjustment Factors for Sub-Size Impact Specimens Steel Composition Limits for Bodies, Bonnets, and End and Outlet Connections Material Phosphorus and Sulfur Concentration Limitations Alloying Element Maximum Tolerance Range Requirements Quality Control Requirements for Bodies, Bonnets, and End and Outlet Connections Quality Control Requirements Welding Quality Control Requirements for Stems viii

13 7.4 Quality Control Requirements for Valve Bore Sealing Mechanisms and Choke Trim Quality Control Requirements for Ring Joint Gaskets Quality Control Requirements for Studs and Nuts Quality Control Requirements for Nonmetallic Sealing Materials Drift Diameter for Individual Flowline Valves and Christmas Trees Hydrostatic Body Test Pressure, psi (MPa) Quality Control Requirements for Full Bore Valves Quality Control Requirements for Regular and Venturi Bore Valves Quality Control Requirements for Production Check Valves Quality Control Requirements for Casing and Tubing Heads, Tubing Head Adapters, Chokes, Tees, Crosses, Fluid Sampling Devices, Crossover Connectors, and Adapter and Spacer Spools Quality Control Requirements for Christmas Trees Quality Control Requirements for Casing and Tubing Hanging Mandrels Marking Requirements and Locations Additional Marking for Wellhead Equipment Additional Marking for Connectors and Fittings Additional Marking for Hangers Additional Marking for Valves and Chokes Marking for Choke Beans Marking for Ring Gaskets Marking for Christmas Trees and Assemblies of Actuators and Valves Prepared for Actuators Rated Working Pressures and Size Ranges of API Flanges Type 6B Flanges for 2000 psi Rated Working Pressure Type 6B Flanges for 3000 psi Rated Working Pressure Type 6B Flanges for 5000 psi Rated Working Pressure Rough Machining Detail for Corrosion Resistant API Ring Groove Type 6BX Integral Flanges for 2000, 3000, 5000, and 10,000 psi Rated Working Pressure Type 6BX Integral Flanges for 15,000 and 20,000 psi Rated Working Pressure Type 6BX Welding Neck Flanges for 10,000 and 15,000 psi Rated Working Pressure Type 6BX Welding Neck Flanges for 20,000 psi Rated Working Pressure Type 6BX Blind and Test Flanges for 10,000 and 15,000 psi Rated Working Pressure Type 6BX Blind and Test Flanges for 15,000 and 20,000 psi Rated Working Pressure Dimensions for 5,000 psi Rated Working Pressure Segmented Flanges for Dual Completion Type 6 BX Blind Flanges API Thread Counterbore and Standoff Dimensions Bolting Requirements for API End Flanges Type R Ring Gaskets API Type RX Pressure Energized Ring Gaskets API Type BX Pressure Energized Ring Gaskets Operating Cycle Requirements for Valves Flanged Plug and Gate Valves 2000 psi Rated Working Pressure Flanged Plug and Gate Valves 3000 psi Rated Working Pressure Flanged Plug and Gate Valves 5000 psi Rated Working Pressure Flanged Plug and Gate Valves 10,000 psi Rated Working Pressure ix Page

14 Page Flanged Plug and Gate Valves 15,000 psi Rated Working Pressure Flanged Plug and Gate Valves 20,000 psi Rated Working Pressure Center Distances of Conduit Bores for Dual Parallel Bore Valves Center Distances of Conduit Bores for Triple, Quadruple, and Quintuple Parallel Bore Valves Regular and Full-Opening Flanged Swing and Lift-Check Valves Single and Dual Plate Wafer-Type Check Valves for Use with Flanges Bore Sizes for Full-Bore Check Valves Regular and Full-Opening Flanged Swing and Lift-Check Valves 10,000 psi (69.0 MPa) Rated Working Pressure Regular and Full-Opening Flanged Swing and Lift-Check Valves 15,000 psi (103.4 MPa) Rated Working Pressure Regular and Full-Opening Flanged Swing and Lift-Check Valves 20,000 psi (138 MPa) Rated Working Pressure Minimum Vertical Full-Opening Body Bores and Maximum Casing Sizes Performance Requirements for Slip Hangers Performance Requirements for Mandrel Hangers Maximum Hanger Outside Diameter for Wellheads Performance Requirements for Tubing Head Adapters Performance Requirements for Group 2 Tubing Head Adapters Performance Requirements for Chokes API Flanged Crosses and Tees API Studded Crosses and Tees Performance Requirements for Fluid Sampling Devices Performance Requirements for Crossover Connectors Performance Requirements for Actuators Performance Requirements for Lock Screws, Alignment Pins, and Retainer Screws Performance Requirements for Other End Connectors Operating Cycle Requirements for Safety Valves SSV/USV Functional Test Data Sheet Surface Safety Valve or Underwater Safety Valve Shipping and Receiving Report A1 Relative Corrosivity of Retained Fluids as Indicated by CO 2 Partial Pressure A-2 A2 Recommended Minimum PSL for Primary Parts of Wellheads and Christmas Tree Equipment A-14 Metric 10.2 Type 6B Flanges for 13.8 MPa Rated Working Pressure B-4 Metric 10.3 Type 6B Flanges for 20.7 MPa Rated Working Pressure B-6 Metric 10.4 Type 6B Flanges for 34.5 MPa Rated Working Pressure B-8 Metric 10.5 Rough Machining Detail for Corrosion Resistant API Ring Groove.. B-10 Metric 10.6 Metric 10.7 Metric 10.8 Metric 10.9 Type 6BX Integral Flanges for 13.8, 20.7, 34.5, and 69.0 MPa Rated Working Pressure B-11 Type 6BX Integral Flanges for and MPa Rated Working Pressure B-12 Type 6BX Welding Neck Flanges for 69.0 and MPa Rated Working Pressure B-13 Type 6BX Welding Neck Flanges for MPa Rated Working Pressure B-14 Metric Type 6BX Blind and Test Flanges for 69.0 and MPa Rated Working Pressure B-15 Metric Type 6BX Blind and Test Flanges for and MPa Rated Working Pressure B-16 x

15 Metric Dimensions for 34.5 MPa Rated Working Pressure Segmented Flanges for Dual Completion B-17 Metric Type 6 BX Blind Flanges B-19 Metric Type R Ring Gaskets B-20 Metric API Type RX Pressure Energized Ring Gaskets B-21 Metric API Type BX Pressure Energized Ring Gaskets B-22 Metric Flanged Plug and Gate Valves 13.8 MPa Rated Working Pressure... B-23 Metric Flanged Plug and Gate Valves 20.7 MPa Rated Working Pressure... B-23 Metric Flanged Plug and Gate Valves 69.0 MPa Rated Working Pressure... B-24 Metric Flanged Plug and Gate Valves MPa Rated Working Pressure.. B-24 Metric Flanged Plug and Gate Valves MPa Rated Working Pressure.. B-24 Metric Flanged Plug and Gate Valves 34.5 MPa Rated Working Pressure... B-24 Metric Center Distances of Conduit Bores for Dual Parallel Bore Valves.... B-25 Metric Center Distances of Conduit Bores for Triple, Quadruple, and Quintuple Parallel Bore Valves B-25 Metric Regular and Full Opening Flanged Swing and Lift Check Valves.... B-26 Metric Single and Dual Plate Wafer Type Check Valves for Use with Flanges B-26 Metric Minimum Bore Sizes for Full Bore Check Valves B-26 Metric Flanged Crosses and Tees B-27 Metric API Studded Crosses and Tees B-28 C1 Point-Height of Stud Bolts C-1 D1 Recommended Torques in ft/lbf for Flange Bolting D-2 D2 Recommended Torques in N/m for Flange Bolting D-3 F1.1 Room Temperature Gas Leakage Acceptance Criteria F-3 F1.2 Standard Test Fluids F-5 F1.3 Scaling for Nonmetallic Seals F-6 F2.1 Performance Verification Tests for Valves F-9 F2.2 Performance Verification Tests for Actuators F-12 F2.3 Performance Verification Tests for Chokes F-13 F2.4 Performance Verification for Casing Head Housings, Casing Head Spools, Tubing Head Spools, Crossover Connectors, and Adapter and Spacing Spools F-14 F2.5 Performance Verification for Group 1 Slip Hangers F-15 F2.6 Performance Verification for Group 2 Slip Hangers F-15 F2.7 Performance Verification for Group 3 Slip Hangers F-15 F2.8 Performance Verification for Group 4 Slip Hangers F-19 F2.9 Performance Verification for Group 1 Mandrel Hangers F-19 F2.10 Performance Verification for Group 2 Mandrel Hangers F-20 F2.11 Performance Verification for Group 3 Mandrel Hangers F-20 F2.12 Performance Verification for Group 4 Mandrel Hangers F-21 F2.13 Performance Verification for Group 5 Mandrel Hangers F-22 F2.14 Performance Verification for Lockdown Screws, Alignment Pins and Retainer Screw Packing Mechanisms F-22 F2.15 Performance Verification for Group 1 Tubing Adapters F-22 F2.16 Performance Verification for Group 2 Tubing Head Adapters F-23 F2.17 Performance Verification for Other End Connectors F-23 F2.18 Performance Verification for Fluid Sampling Devices F-23 G1 Temperature Ratings G-1 G2 Optional Pressure-Temperature Ratings for 6B Flanges G-1 G3 Optional Material Derating Factors for Elevated Temperature G-2 L1 Failure Report for Surface Safety Valves (SSV) and Underwater Safety Valves (USV) (Minimum Data) G-1 Page xi

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17 Specification for Wellhead and Christmas Tree Equipment 1 Scope 1.1 PURPOSE This specification was formulated to provide for the availability of safe, dimensionally and functionally interchangeable wellhead and Christmas tree equipment. The technical content provides requirements for performance, design, materials, testing, inspection, welding, marking, handling, storing and shipping by the manufacturer. This specification does not apply to field use or field testing of wellhead and Christmas tree equipment. Critical components are those parts having requirements specified in this document. 1.2 APPLICATIONS Coverage This specification covers equipment utilized for pressure control systems for the production of oil and gas. Specific equipment covered by this specification is listed as follows: a. Wellhead Equipment Casing Head Housings Casing Head Spools Tubing Head Spools Crossover Spools Multistage Head Housings and Spools b. Connectors and Fittings Crossover Connectors Tubing Head Adapters Top Connectors Tees and Crosses Fluid Sampling Devices Adapter and Spacer Spools c. Casing and Tubing Hangers Mandrel Hangers Slip Hangers d. Valves and Chokes Single Completion Valves Multiple Completion Valves Actuated Valves Valves Prepared for Actuators Check Valves Chokes Surface and Underwater Safety Valves and Actuators for Offshore Service e. Loose Connectors [Flanged, Threaded, Other End Connectors (O.E.C.), and Welded] Weld Neck Connectors 1-1 Blind Connectors Threaded Connectors Adapter and Spacer Connectors f. Other Equipment Actuators Ring Gaskets The typical equipment nomenclature used in this specification is shown in Figure 1.1 and Figure 1.2. Appendix A provides purchasing guidelines to users for API Spec 6A equipment Service Conditions a. General Service conditions refer to classifications for pressure, temperature, and the various well-bore constituents and operating conditions. b. Pressure Ratings Pressure ratings indicate rated working pressures expressed as gage pressure (psig or MPa gage). c. Temperature Ratings Temperature ratings indicate temperature ranges, from minimum ambient to maximum flowing fluid temperatures, expressed in degrees Fahrenheit ( F) or degrees Celsius ( C). d. Materials Class Ratings Materials class ratings indicate the material for the equipment components. A guideline (not a requirement) for the basic well-bore constituents and operating conditions is covered in Appendix A. 1.3 PRODUCT SPECIFICATION LEVELS (PSL) a. General This specification establishes requirements for four product specification levels. These four PSL designations define different levels of technical requirements. Appendix A provides guidelines (not requirements) for selecting an acceptable PSL. b. PSL 1 PSL 1 includes practices currently being implemented by a broad spectrum of the industry for service conditions recommended in Appendix A of this specification. c. PSL 2 PSL 2 includes all the requirements of PSL 1 plus additional practices currently being implemented by a broad spectrum of the industry for service conditions recommended in Appendix A of this specification. d. PSL 3 PSL 3 includes all the requirements of PSL 2 plus additional practices currently being implemented by a broad

18 1-2 API SPECIFICATION 6A Figure 1.1 Typical Wellhead Assembly Nomenclature

19 SPECIFICATION FOR WELLHEAD AND CHRISTMAS TREE EQUIPMENT 1-3 Figure 1.2 Typical Christmas Tree Nomenclature

20 1-4 API SPECIFICATION 6A spectrum of users for the service conditions recommended in Appendix A of this specification. e. PSL 4 PSL 4 includes all the requirements of PSL 3 plus additional practices currently being implemented by a broad spectrum of users for the service conditions recommended in Appendix A of this specification. 1.4 INTERCHANGEABILITY A decimal/inch system is the standard for the dimensions shown in this specification. Nominal sizes will continue to be shown as fractions. This change from previous editions of API Spec 6A reflects current widespread industry practice. It is not intended that this modify the fractional dimensions or tolerances from earlier editions. Table 4.4 gives fraction to decimal equivalence. For the purposes of this specification, the fractions and their decimal equivalents are equal and interchangeable. Metric conversions and dimensional tables are in Appendix B. Millimeter dimensions in this specification are based on the original fractional inch designs. Functional dimensions have been converted exactly into the metric system to insure interchangeability of products manufactured in inch and metric systems. All parts whose physical dimensions conform to the inch tables incorporated into the body of this specification or to the metric tables in Appendix B are acceptable under this specification. 1.5 APPENDICES Appendices to this specification are not requirements. They are included only as guidelines or information.

21 SPECIFICATION FOR WELLHEAD AND CHRISTMAS TREE EQUIPMENT References 2.1 GENERAL Only those reference standards listed in Section 2.2 are considered part of this specification. Documents (sub-tier) that are referenced by those documents are not considered part of this specification. When the latest edition is specified it may be used on issue and shall be mandatory 6 months from the date of revision. The replaced edition may be used up to 6 months from the date of the latest revision. 2.2 REFERENCE STANDARDS This specification includes by reference, either in total or in part, other API, industry and government standards listed below: The latest edition of these standards shall be used unless otherwise noted below: API Spec 5B Spec 5CT Spec 5L Spec 6AV1 RP 14F Threading, Gaging, and Thread Inspection of Casing, Tubing and Line Pipe Threads Casing and Tubing Line Pipe Verification Test of Wellhead Surface Safety Valves and Underwater Safety Valves for Offshore Service Recommended Practice for Design and Inspection of Electrical Systems for Offshore Production Platforms ANSI 1 B1.1 Unified Standard Inch Screw Threads B1.2 Gages and Gaging for Unified Inch Screw Threads ANSI/ASQC Z1.4 Sampling Procedures and Tables for Inspection by Attributes ASME/ANSI B B Pipe Threads, General Purpose (Inch) Square and Hex Nuts ASME 2 Boiler and Pressure Vessel Code Section V, Nondestructive Testing, Article 5, UT Examination Methods for Materials and Fabrication Para. T522 & T542 1 American National Standards Institute, 11 West 42nd Street, New York, New York ASME International, 345 E. 47th Street, New York, New York ASNT 3 SNT-TC-1A ASTM 4 A 193 A 194 A 307 A 320 A 370 A 388 Section VIII, Division 1 a) Part UG-101: Proof Tests to Establish Maximum Allowable Working Pressure b) Appendix 4: Rounded Indication Charts Acceptance Standard for Radiographically Determined Rounded Indications in Welds. Section VIII, Division 2: Pressure Vessels Alternate Rules a) Appendix 4: Design Based on Stress Analysis b) Appendix 6: Experimental Stress Analysis Section IX, Welding and Brazing Qualifications. Personnel Qualification and Certification in Nondestructive Testing Alloy Steel and Stainless Steel Bolting Materials for High Temperature Service Carbon Alloy Steel Nuts for Bolts for High Pressure Temperature Service Carbon Steel Externally Threaded Standard Fasteners Alloy Steel Bolting Materials for Low Temperature Service Standard Methods and Definitions for Mechanical Testing of Steel Products Recommended Practice for Ultrasonic Examination of Heavy Steel Forgings A 453 Bolting Materials, High Temperature, 50 to 129 ksi Yield Strength, with Expansion Coefficients Comparable to Austenitic Steels A 609 A 703/ A 703M D 395 D 412 D 471 D 573 D 865 D 1414 Specification for Ultrasonic Examination for Carbon and Low-Alloy Steel Castings Specification for Steel Castings, General Requirements, for Pressure Containing Parts Rubber Property Compression Set Rubber Properties in Tension Rubber Property Effect on Liquids Rubber Deterioration in an Air Oven Rubber Deterioration by Heating in Air (Test Tube Enclosure) Rubber O-Rings 3 American Society for Nondestructive Testing, 1711 Arlington Lane, P.O. Box 28518, Columbus, Ohio American Society of Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, Pennsylvania

22 2-2 API SPECIFICATION 6A D 1415 D 1418 D 2240 E 10 E 18 E 92 E 94 E 140 E 165 E 186 Rubber Property International Hardness Rubber and Rubber Latices Nomenclature Rubber Property Durometer Hardness Standard Test Methods for Brinell Hardness of Metallic Materials Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials Standard Test Method for Vickers Hardness of Metallic Materials Standard Practice for Radiographic Testing Standard Hardness Conversion Tables for Metals Standard Practice for Liquid Penetrant Inspection Standard Reference for Heavy Walled (2 to 4 1 / 2 in.) (51 to 114 mm) Steel Castings E 280 Standard Reference Radiographs for 4 1 / 2 to 12 in. (114 to 305 mm) Steel Castings E 428 E 446 E 709 E 747 Standard Recommended Practice for Fabrication and Control of Steel Reference Blocks Used in Ultrasonic Inspection Standard Reference Radiographs for Steel Castings up to 2 in. in Thickness Standard Recommended Practice for Magnetic Particle Examination Standard Method for Controlling Quality of Radiographic Testing Using Wire Penetrameters MIL STD 5 H-6875F Heat Treatment of Steels Aircraft Practice Process MSS SP-55 6 Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other Piping Components (Visual Method) NACE 7 MR REQUIREMENTS Sulfide Stress Cracking Resistant Metallic Materials for Oilfield Equipment Requirements of other standards included by reference in this specification are essential to the safety and interchangeability of the equipment produced. 2.4 EQUIVALENT STANDARDS Standards referenced in this specification may be replaced by other international or national standards that can be shown to meet or exceed the requirements of the referenced standard. Manufacturers who use other standards in lieu of standards referenced herein are responsible for documenting the equivalency of the standards. 5 Available from the U.S. Government Printing Office, Washington, DC Manufacturers Standardization Society of the Valve and Fittings Industry, 1815 North Fort Myers Drive, Arlington, Virginia National Association of Corrosion Engineers, 1440 South Creek Drive, P.O. Box , Houston, Texas

23 SPECIFICATION FOR WELLHEAD AND CHRISTMAS TREE EQUIPMENT Abbreviations/Definitions 3.1 ANSI API ASME ASME/SPPE ASNT ASTM AWS cc CRA degrees F ID max. min. MSS NACE NDE OD OEC PR1 PR2 psi PSL SSV temp USV 3.2 DEFINITIONS at American National Standards Institute American Petroleum Institute American Society of Mechanical Engineers (ASME International) refers to the program described in ASME SPPE 1 and 2 American Society for Nondestructive Testing American Society for Testing and Materials American Welding Society cubic centimeters corrosion resistant alloy degrees Fahrenheit ( F) inside diameter maximum minimum Manufacturers Standardization Society of the Valve and Fittings Industry National Association of Corrosion Engineers (NACE International) nondestructive examination outside diameter other end connector Performance Requirement Level One Performance Requirement Level Two pounds per square inch Product Specification Level surface safety valve temperature underwater safety valve acceptance criteria: Defined limits placed on characteristics of materials, products, or services accessible wetted surface: Those wetted surfaces which could be viewed for NDE purposes by direct line of sight. This excludes test ports, control line ports, lockdown screw holes and other penetrations of these types actuator: A mechanism for the remote or automatic operation of a valve or choke adapter: A pressure containing piece of equipment having end connections of different nominal sizes and/or pressure ratings, used to connect other pieces of equipment of different API nominal sizes and/or pressure ratings annular packoff: A mechanism that seals off annular pressure between the OD of a suspended tubular member or hanger and the ID of the head or spool through which the tubular member passes or hanger is suspended API monogram: A registered mark of the American Petroleum Institute, API as shipped condition: The condition of the product or equipment when it is ready for shipment authorized facility: A facility authorized under the applicable quality assurance program specified by the operator on the purchase order (applicable to SSV/USV equipment) authorized quality assurance program: API or SPPE Quality Program (applicable to SSV/USV equipment) back pressure valve: A check valve that is installed through the Christmas tree, into the tubing hanger, and prevents well fluids from flowing out of the well body: Any portion of API Spec 6A equipment between end connections, with or without internal parts, which contains well-bore pressure bolting: Threaded fasteners (studs, nuts, bolts and capscrews) used to assemble pressure containing parts or join end or outlet connections bonnet: A pressure-containing closure for a body, other than an API end or outlet connection bottom casing packoff: A mechanism that seals off annular pressure between the OD of a suspended tubular member or hanger and the ID of the spool or tubing head adapter being placed over the suspended tubular or hanger bottom hole test adapter: See top connector calibration: Comparison and adjustment to a standard of known accuracy carbon steel: An alloy of carbon and iron containing a maximum of 2% carbon, 1.65% manganese, and residual quantities of other elements, except those intentionally added in specific quantities for deoxidation (usually silicon and/or aluminum).