Specification for Wellhead and Christmas Tree Equipment

ANSI/API SPECIFICATION 6A TWENTIETH EDITION, OCTOBER 2010

EFFECTIVE DATE: APRIL 1, 2011

ERRATA 1, JANUARY 2011

ERRATA 2, NOVEMBER 2011

ERRATA 3, JUNE 2013

ERRATA 4, AUGUST 2013

ERRATA 5, NOVEMBER 2013

ERRATA 6, MARCH 2014

ERRATA 7, DECEMBER 2014

ERRATA 8, FEBRUARY 2016

ERRATA 9, JUNE 2016

ERRATA 10, AUGUST 2016

ADDENDUM 1, NOVEMBER 2011

ADDENDUM 2, NOVEMBER 2012

ADDENDUM 3, MARCH 2013

ADDENDUM 4, JUNE 2016

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

Specification for Wellhead and Christmas Tree Equipment

Upstream Segment

ANSI/API SPECIFICATION 6A TWENTIETH EDITION, OCTOBER 2010

EFFECTIVE DATE: APRIL 1, 2011

ERRATA 1, JANUARY 2011

ERRATA 2, NOVEMBER 2011

ERRATA 3, JUNE 2013

ERRATA 4, AUGUST 2013

ERRATA 5, NOVEMBER 2013

ERRATA 6, MARCH 2014

ERRATA 7, DECEMBER 2014

ERRATA 8, FEBRUARY 2016

ERRATA 9, JUNE 2016

ERRATA 10, AUGUST 2016

ADDENDUM 1, NOVEMBER 2011

ADDENDUM 2, NOVEMBER 2012

ADDENDUM 3, MARCH 2013

ADDENDUM 4, JUNE 2016

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

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.

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

Contents Page

API Foreword iii

Foreword ix

Introduction x

1. Scope 1

   1. Purpose 1

   2. Applicability 1

   3. Service conditions 2

   4. Product specification levels 3

2. Normative references 6

3. Terms, definitions and abbreviated terms 8

   1. Terms and definitions 8

   2. Abbreviated terms 20

4. Design and performance — General requirements 21

   1. Performance requirements — General 21

   2. Service conditions 21

   3. Design methods 24

   4. Miscellaneous design information 28

   5. Design documentation 29

   6. Design review 29

   7. Design validation 29

5. Materials — General requirements 29

   1. General 29

   2. Written specifications 30

   3. Mandrel tubing hangers and casing hangers 31

   4. Bodies, bonnets and end and outlet connections 34

   5. Ring gaskets 41

   6. Test coupons 42

   7. Qualification test coupons 47

   8. Heat-treating equipment qualification 49

   9. Material qualification 49

   10. Pressure-boundary penetrations 49

   11. Wear bushings 50

   12. Clamp hub-end connectors 50

6. Welding — General requirements 50

   1. General 50

   2. Non-pressure-containing weldments other than weld overlays — PSL 1 to PSL 3 50

   3. Pressure-containing fabrication weldments for bodies, bonnets, end and outlet connections, bullplugs, valve-removal plugs and back-pressure valves 50

   4. Pressure-containing repair weldments for bodies, bonnets, end and outlet connections, bullplugs, valve-removal plugs and back-pressure valves 56

   5. Weld overlay for corrosion resistance and/or hard facing and other material surface property controls 58

7. Quality control 62

   1. General 62

   2. Measuring and testing equipment 62

   3. Quality-control personnel qualifications 62

   4. Quality control requirements 63

   5. Quality control records requirements 103

8. Equipment marking 108

   1. Marking requirements 108

   2. Wellhead equipment 110

   3. Connectors and fittings 110

   4. Casing and tubing hangers 110

   5. Valves and chokes 111

   6. Loose connectors [flanged, threaded, other end connectors (OEC) and welded] 112

   7. Other equipment 112

   8. Studs and nuts 113

   9. Christmas trees 113

   10. Valve-removal plugs 114

   11. Bullplugs 114

   12. Back-pressure valves 114

9. Storing and shipping 114

   1. Draining after testing 114

   2. Rust prevention 114

   3. Sealing-surface protection 114

   4. Assembly and maintenance instructions 114

   5. Ring gaskets 114

   6. Age control of non-metallic materials 114

10. Equipment-specific requirements 115

    1. Flanged end and outlet connections 115

    2. Threaded end and outlet connections 151

    3. Studs and nuts 157

    4. Ring gaskets 159

    5. Valves 167

    6. Casing and tubing heads 180

    7. Casing and tubing hangers 185

    8. Tubing-head adapters 191

    9. Chokes 193

    10. Tees and crosses 196

    11. Test and gauge connections for 103,5 MPa and 138,0 MPa (15 000 psi and 20 000 psi) equipment 201

    12. Fluid sampling devices 203

    13. Christmas trees 204

    14. Cross-over connectors 204

    15. Adapter and spacer spools 209

    16. Actuators 210

    17. Packing mechanisms for lock screws, alignment pins and retainer screws 215

    18. Other end connectors 216

    19. Top connectors 217

    20. Surface and underwater safety valves and actuators 218

    21. Bullplugs 224

    22. Valve-removal plugs 227

    23. Other pressure-boundary penetrations 228

    24. Back-pressure valves 228

11. Repair and remanufacture 229

Annex A (informative) Purchasing guidelines 230

Annex B (informative) USC unit tables and data for this International Standard 249

Annex C (informative) Method of calculating stud bolt lengths for type 6B and 6BX flanges 307

Annex D (informative) Recommended flange bolt torque 309

Annex E (informative) Recommended weld preparation design dimensions 313

Annex F (informative) Design validation procedures 317

Annex G (informative) Design and rating of equipment for use at elevated temperatures 352

Annex H (normative) Design and manufacture of surface wellhead running, retrieving and testing tools, clean-out tools and wear bushings 356

Annex I (normative) Design validation procedures for surface safety valves and underwater safety valves 360

Annex J (normative) Repair and remanufacture requirements 368

Annex K (informative) Recommended specifications for top connectors for christmas trees 382

Annex L (normative) Specifications for valve-removal preparations, valve-removal plugs and

handling tools 396

Annex M (informative) Qualification of heat-treating equipment 416

Annex N (informative) List of tables and list of figures 419

Annex O (normative) API Regional Annex 429

Annex P (informative) Use of the API Monogram by Licensees and Test Agency Licensing 443

Bibliography 446

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.

Introduction

This International Standard, which has been technically revised, is based on API Spec 6A, nineteenth edition, July 2004 and its addendums and errata, and API Spec 6AV1, first edition, February 1996 and its errata, with the intent that the twentieth edition of API Spec 6A will be identical to this International Standard.

The International System of units (SI) is used in this International Standard. However, nominal sizes are shown as fractions in the inch system.

The fractions and their decimal equivalents are equal and interchangeable. Metric conversions and inch dimensions in this International Standard are based on the original fractional inch designs. Functional dimensions have been converted into the metric system to ensure interchangeability of products manufactured in metric or inch systems; see also Annex B.

Tables referenced in the main body of this International Standard that are marked with an asterisk (*) are repeated in Annex B in US Customary (USC) units with the same table number as in the main body but with the prefix B. In figures where dimensions are given only in inches, the values of surface roughness have been indicated in accordance with US draughting conventions.

It is necessary that users of this International Standard be aware that further or differing requirements can be needed for individual applications. This International Standard is not intended to inhibit a vendor from offering, or the purchaser from accepting, alternative equipment or engineering solutions for the individual application. This can be particularly applicable where there is innovative or developing technology. Where an alternative is offered, it is the responsibility of the vendor to identify any variations from this International Standard and provide details.

API Specification 6A/ISO 10423

Petroleum and natural gas industries — Drilling and production equipment — Wellhead and christmas tree equipment

1. Scope

   
   

   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.

      
      

   2. Applicability

This International Standard is applicable to the following specific equipment:

1. wellhead equipment:

   
   

   • casing-head housings,

     
     

   • casing-head spools,

     
     

   • tubing-head spools,

     
     

   • cross-over spools,

     
     

   • multi-stage head housings and spools;

     
     

2. connectors and fittings:

   
   

   • cross-over connectors,

     
     

   • tubing-head adapters,

     
     

   • top connectors,

     
     

   • tees and crosses,

     
     

   • fluid-sampling devices,

     
     

   • adapter and spacer spools;

     
     

3. casing and tubing hangers:

   
   

   • mandrel hangers,