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Specification for Wellhead and
Christmas Tree Equipment
ANSI/API SPECIFICATION 6A
TWENTIETH EDITION, OCTOBER 2010
EFFECTIVE DATE: APRIL 1, 2011
ERRATA 1, JANUARY 2011
CONTAINS API MONOGRAM ANNEX AS PART OF U.S. NATIONAL
ADOPTION
ISO 10423:2009 (Modified), Petroleum and natural gas
industries—Drilling and production equipment—
Wellhead and christmas tree equipment
Copyright American Petroleum Institute Provided by IHS under license with API
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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.
Neither API nor any of API's employees, subcontractors, consultants, committees, or other assignees make any warranty or representation, either express or implied, with respect to the accuracy, completeness, or usefulness of the information contained herein, or assume any liability or responsibility for any use, or the results of such use, of any information or process disclosed in this publication. Neither API nor any of API's employees, subcontractors, consultants, or other assignees represent that use of this publication would not infringe upon privately owned rights.
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 authorities having jurisdiction with which this publication may conflict.
API publications are published to facilitate the broad availability of proven, sound engineering and operating practices. These publications are not intended to obviate the need for applying sound engineering judgment regarding when and where these publications should be utilized. The formulation and publication of API publications 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.
Users of this Specification should not rely exclusively on the information contained in this document. Sound business, scientific, engineering, and safety judgment should be used in employing the information contained herein.
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Copyright © 2010 American Petroleum Institute
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API Foreword
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.
Shall: As used in a standard, "shall" denotes a minimum requirement in order to conform to the specification.
Should: As used in a standard, "should" denotes a recommendation or that which is advised but not required in order to conform to the specification.
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 publication or comments and questions concerning the procedures under which this publication was developed should be directed in writing to the Director of Standards, American Petroleum Institute, 1220 L Street, NW, Washington, DC 20005. Requests for permission to reproduce or translate all or any part of the material published herein should also be addressed to the director.
Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at least every five years. A one-time extension of up to two years may be added to this review cycle. Status of the publication can be ascertained from the API Standards Department, telephone (202) 682-8000. A catalog of API publications and materials is published annually by API, 1220 L Street, NW, Washington, DC 20005.
Suggested revisions are invited and should be submitted to the Standards Department, API, 1220 L Street, NW, Washington, DC 20005, standards@api.org.
iii
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v
Contents Page
API Foreword ..................................................................................................................................................... iii Foreword ............................................................................................................................................................ ix
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- 1 Scope Introduction x
- 1.1 Purpose
- 1.2 Applicability
- 1.3 Service conditions.................................................................................................................................
- 1.4 Product specification levels
- 2 Normative references
- 3 Terms, definitions and abbreviated terms
- 3.1 Terms and definitions
- 3.2 Abbreviated terms
- 4 Design and performance — General requirements
- 4.1 Performance requirements — General..............................................................................................
- 4.2 Service conditions...............................................................................................................................
- 4.3 Design methods...................................................................................................................................
- 4.4 Miscellaneous design information
- 4.5 Design documentation
- 4.6 Design review
- 4.7 Design validation
- 5 Materials — General requirements
- 5.1 General
- 5.2 Written specifications
- 5.3 Mandrel tubing hangers and casing hangers
- 5.4 Bodies, bonnets and end and outlet connections
- 5.5 Ring gaskets
- 5.6 Test coupons
- 5.7 Qualification test coupons
- 5.8 Heat-treating equipment qualification
- 5.9 Material qualification
- 5.10 Pressure-boundary penetrations
- 5.11 Wear bushings
- 5.12 Clamp hub-end connectors
- 6 Welding — General requirements
- 6.1 General
- 6.2 Non-pressure-containing weldments other than weld overlays — PSL 1 to PSL
- bullplugs, valve-removal plugs and back-pressure valves............................................................. 6.3 Pressure-containing fabrication weldments for bodies, bonnets, end and outlet connections,
- bullplugs, valve-removal plugs and back-pressure valves............................................................. 6.4 Pressure-containing repair weldments for bodies, bonnets, end and outlet connections,
- controls................................................................................................................................................. 6.5 Weld overlay for corrosion resistance and/or hard facing and other material surface property
- 7 Quality control
- 7.1 General
- 7.2 Measuring and testing equipment
- 7.3 Quality-control personnel qualifications
- 7.4 Quality control requirements
- 7.5 Quality control records requirements
- 8 Equipment marking
- 8.1 Marking requirements
- 8.2 Wellhead equipment vi
- 8.3 Connectors and fittings
- 8.4 Casing and tubing hangers
- 8.5 Valves and chokes
- 8.6 Loose connectors [flanged, threaded, other end connectors (OEC) and welded]
- 8.7 Other equipment
- 8.8 Studs and nuts
- 8.9 Christmas trees
- 8.10 Valve-removal plugs
- 8.11 Bullplugs............................................................................................................................................
- 8.12 Back-pressure valves
- 9 Storing and shipping
- 9.1 Draining after testing
- 9.2 Rust prevention.................................................................................................................................
- 9.3 Sealing-surface protection
- 9.4 Assembly and maintenance instructions
- 9.5 Ring gaskets......................................................................................................................................
- 9.6 Age control of non-metallic materials
- 10 Equipment-specific requirements
- 10.1 Flanged end and outlet connections
- 10.2 Threaded end and outlet connections
- 10.3 Studs and nuts
- 10.4 Ring gaskets......................................................................................................................................
- 10.5 Valves
- 10.6 Casing and tubing heads
- 10.7 Casing and tubing hangers
- 10.8 Tubing-head adapters
- 10.9 Chokes
- 10.10 Tees and crosses
- equipment 10.11 Test and gauge connections for 103,5 MPa and 138,0 MPa (15 000 psi and 20 000 psi)
- 10.12 Fluid sampling devices
- 10.13 Christmas trees
- 10.14 Cross-over connectors
- 10.15 Adapter and spacer spools..............................................................................................................
- 10.16 Actuators
- 10.17 Packing mechanisms for lock screws, alignment pins and retainer screws
- 10.18 Other end connectors
- 10.19 Top connectors
- 10.20 Surface and underwater safety valves and actuators...................................................................
- 10.21 Bullplugs............................................................................................................................................
- 10.22 Valve-removal plugs
- 10.23 Other pressure-boundary penetrations
- 10.24 Back-pressure valves
- 11 Repair and remanufacture
- Annex A (informative) Purchasing guidelines
- Annex B (informative) USC unit tables and data for this International Standard
- Annex C (informative) Method of calculating stud bolt lengths for type 6B and 6BX flanges
- Annex D (informative) Recommended flange bolt torque
- Annex E (informative) Recommended weld preparation design dimensions
- Annex F (informative) Design validation procedures
- Annex G (informative) Design and rating of equipment for use at elevated temperatures
- tools, clean-out tools and wear bushings Annex H (normative) Design and manufacture of surface wellhead running, retrieving and testing
- valves Annex I (normative) Design validation procedures for surface safety valves and underwater safety
Copyright American Petroleum Institute Provided by IHS under license with API No reproduction or networking permitted without license from IHS Not for Resale
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ix
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 10423 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum , petrochemical and natural gas industries , Subcommittee SC 4, Drilling and production equipment.
This fourth edition cancels and replaces the third edition (ISO 10423:2003), which has been technically revised.
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API Specification 6A/ISO 10423
1
Petroleum and natural gas industries — Drilling and production equipment — Wellhead and christmas tree equipment
1 Scope
1.1 Purpose
This International Standard specifies requirements and gives recommendations for the performance, dimensional and functional interchangeability, design, materials, testing, inspection, welding, marking, handling, storing, shipment, purchasing, repair and remanufacture of wellhead and christmas tree equipment for use in the petroleum and natural gas industries.
This International Standard does not apply to field use, field testing or field repair of wellhead and christmas tree equipment.
1.2 Applicability
This International Standard is applicable to the following specific equipment:
a) wellhead equipment:
⎯ casing-head housings,
⎯ casing-head spools,
⎯ tubing-head spools,
⎯ cross-over spools,
⎯ multi-stage head housings and spools;
b) connectors and fittings:
⎯ cross-over connectors,
⎯ tubing-head adapters,
⎯ top connectors,
⎯ tees and crosses,
⎯ fluid-sampling devices,
⎯ adapter and spacer spools;
c) casing and tubing hangers:
⎯ mandrel hangers,
Copyright American Petroleum Institute Provided by IHS under license with API
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2 S PECIFICATION FOR W ELLHEAD AND CHRISTMAS TREE E QUIPMENT
⎯ slip hangers;
d) valves and chokes:
⎯ single valves,
⎯ multiple valves,
⎯ actuated valves,
⎯ valves prepared for actuators,
⎯ check valves,
⎯ chokes,
⎯ surface and underwater safety valves and actuators,
⎯ back-pressure valves;
e) loose connectors [flanged, threaded, other end connectors (OEC), and welded]:
⎯ weld neck connectors,
⎯ blind connectors,
⎯ threaded connectors,
⎯ adapter and spacer connectors,
⎯ bullplugs,
⎯ valve-removal plugs;
f) other equipment:
⎯ actuators,
⎯ clamp hubs,
⎯ pressure boundary penetrations,
⎯ ring gaskets,
⎯ running and testing tools (see Annex H),
⎯ wear bushings (see Annex H).
The nomenclature used in this International Standard for typical equipment is shown in Figures 1 and 2. All parts whose physical dimensions conform to the metric tables incorporated into the body of this International Standard or to the tables in USC units in Annex B are acceptable; see Introduction.
1.3 Service conditions
This International Standard defines service conditions, in terms of pressure, temperature and material class for the well-bore constituents, and operating conditions.
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4 S PECIFICATION FOR W ELLHEAD AND CHRISTMAS TREE E QUIPMENT
Key 23 studded side-outlet connection 29 casing-head spool 24 extended neck tubing hanger seal 30 inner casing 25 annular tubing hanger seal 31 intermediate casing 26 tubing hanger mandrel 32 flanged end connection 27 flanged outlet connection 33 tubing hanger mandrel seals 28 casing hanger mandrel 34 wrap-around hanger pack-off
Figure 1 — Typical wellhead assembly nomenclature ( continued )
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API S PECIFICATION 6A/ISO 10423 5
Key 1 gauge valve 8 wing valve (manual or actuated) 2 bonnet nut 9 choke 3 blanking plug 10 surface safety valve 4 body 11 actuator 5 top connector 12 master valve 6 swab or crown valve 13 tubing-head adapter 7 tee
Figure 2 — Typical christmas tree nomenclature
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API S PECIFICATION 6A/ISO 10423 7
ASME 2)^ B1.1, Unified Inch Screw Threads (UN and UNR Thread Form)
ASME B1.2, Gages and Gaging for Unified Inch Screw Threads
ASME B1.3, Screw Thread Gaging Systems for Acceptability: Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ)
ASME B1.5, ACME Screw Threads
ASME B1.20.1, Pipe Threads, General Purpose (Inch)
ASME Boiler and Pressure Vessel Code:2004 with 2005 and 2006 addenda, Section V, Nondestructive Examination
ASME Boiler and Pressure Vessel Code:2004 with 2005 and 2006 addenda, Section VIII, Division 1, Rules for Construction of Pressure Vessels
ASME Boiler and Pressure Vessel Code:2004 with 2005 and 2006 addenda, Section VIII, Division 2, Alternative Rules
ASME Boiler and Pressure Vessel Code:2004 with 2005 and 2006 addenda, Section IX, Welding and Brazing Qualifications
ASNT 3)^ SNT-TC-1A, Non-Destructive Testing
ASTM 4 )^ A193/A193M, Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High Temperature or High Pressure Service and Other Special Purpose Applications
ASTM A194/A194M, Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both
ASTM A320/A320M, Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for Low- Temperature Service
ASTM A370, Standard Test Methods and Definitions for Mechanical Testing of Steel Products
ASTM A388/A388M, Standard Practice for Ultrasonic Examination of Heavy Steel Forgings
ASTM A453/A453M, Standard Specification for High-Temperature Bolting Materials, with Expansion Coefficients Comparable to Austenitic Stainless Steels
ASTM A703/A703M-08a, Standard Specification for Steel Castings, General Requirements, for Pressure- Containing Parts
ASTM D395, Standard Test Methods for Rubber Property — Compression Set
ASTM D412, Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers — Tension
ASTM D471, Standard Test Method for Rubber Property — Effect of Liquids
ASTM D1414, Standard Test Methods for Rubber O-Rings
ASTM D1415, Standard Test Method for Rubber Property — International Hardness
ASTM D1418, Standard Practice for Rubber and Rubber Latices — Nomenclature
- ASME International, 345 East 47th^ Street, New York, NY 10017-2392, USA.
- American Society for Nondestructive Testing, 4153 Arlingate Plaza, Columbus, OH 43228-0518, USA.
Copyright American Petroleum Institute4)^ American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohoken, PA 19428-2959, USA. Provided by IHS under license with API No reproduction or networking permitted without license from IHS Not for Resale
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8 S PECIFICATION FOR W ELLHEAD AND CHRISTMAS TREE E QUIPMENT
ASTM D2240, Standard Test Method for Rubber Property — Durometer Hardness
ASTM E10, Standard Test Method for Brinell Hardness of Metallic Materials
ASTM E18, Standard Test Methods for Rockwell Hardness of Metallic Materials
ASTM E92, Standard Test Method for Vickers Hardness of Metallic Materials
ASTM E94, Standard Guide for Radiographic Examination
ASTM E140, Standard Hardness Conversion Tables for Metals — Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness and Scleroscope Hardness
ASTM E165, Standard Practice for Liquid Penetrant Examination for General Industry
ASTM E428, Standard Practice for Fabrication and Control of Metal, Other than Aluminum, Reference Blocks Used in Ultrasonic Testing
ASTM E709, Standard Guide for Magnetic Particle Testing
ASTM E747, Standard Practice for Design, Manufacture and Material Grouping Classification of Wire Image Quality Indicators (IQI) Used for Radiology
EN 5)^ 473, Non-destructive testing — Qualification and certification of NDT personnel — General principles
MSS 6)^ SP-55, Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other Piping Components — Visual Method for Evaluation of Surface Irregularities
SAE7)^ AMS-H-6875, Heat treatment of steel raw materials
SAE AS 568A:1974, Aerospace size standard for O-rings
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1. acceptance criteria defined limits placed on characteristics of materials, products or services
3.1. accessible wetted surface wetted surface for purposes of non-destructive examination that can be viewed by direct line of sight
NOTE This excludes test ports, control line ports, lockdown screw holes and other penetrations of these types.
3.1. actuator mechanism for the remote or automatic operation of a valve or choke
- European Committee for Standardization, rue de Stassart 36, Brussels B-1050, Belgium.
- Manufacturers Standardization Society of the Valve & Fittings Industry, 127 Park Street, N.E., Vienna, VA 22180, USA.
Copyright American Petroleum Institute7)^ SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, USA. Provided by IHS under license with API
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