Specification for Wellhead and Christmas Tree Equipment

1 Specification for Wellhead and Christmas Tree EquipmentANSI/API Specification 6 ATWENTIETH EDITION, OCTOBER 2010 EFFECTIVE DATE: APRIL 1, 2011 CONTAINS API MONOGRAM ANNEX AS PART OF NATIONAL ADOPTIONISO 10423:2009 (Modified), Petroleum and natural gas industries Drilling and production Equipment Wellhead and Christmas tree Equipment Specification for Wellhead andChristmas Tree EquipmentUpstream SegmentANSI/API Specification 6 ATWENTIETH EDITION, OCTOBER 2010 EFFECTIVE DATE: APRIL 1, 2011 CONTAINS API MONOGRAM ANNEX AS PART OF NATIONALADOPTIONISO 10423:2009 (Modified), Petroleum and natural gasindustries Drilling and production Equipment Wellhead and Christmas tree Equipment Special NotesAPI publications necessarily address problems of a general nature. With respect to particular circumstances, local,state, and federal laws and regulations should be API nor any of API's employees, subcontractors, consultants, committees, or other assignees make anywarranty or representation, either express or implied, with respect to the accuracy, completeness, or usefulness of theinformation contained herein, or assume any liability or responsibility for any use, or the results of such use, of anyinformation or process disclosed in this publication.

2 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 publications may be used by anyone desiring to do so. Every effort has been made by the Institute to assure theaccuracy and reliability of the data contained in them; however, the Institute makes no representation, warranty, orguarantee in connection with this publication and hereby expressly disclaims any liability or responsibility for loss ordamage resulting from its use or for the violation of any authorities having jurisdiction with which this publication publications are published to facilitate the broad availability of proven, sound engineering and operatingpractices. These publications are not intended to obviate the need for applying sound engineering judgmentregarding when and where these publications should be utilized.

3 The formulation and publication of API publicationsis not intended in any way to inhibit anyone from using any other manufacturer marking Equipment or materials in conformance with the marking requirements of an API standardis 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 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. All rights reserved. No part of this work may be reproduced, translated, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission from the publisher.

4 Contact the Publisher, API Publishing Services, 1220 L Street, NW, Washington, DC 2010 American Petroleum Institute API ForewordNothing contained in any API publication is to be construed as granting any right, by implication or otherwise, for themanufacture, sale, or use of any method, apparatus, or product covered by letters patent. Neither should anythingcontained in the publication be construed as insuring anyone against liability for infringement of letters : As used in a standard, "shall" denotes a minimum requirement in order to conform to the : As used in a standard, "should" denotes a recommendation or that which is advised but not required in orderto conform to the Specification . This document was produced under API standardization procedures that ensure appropriate notification andparticipation in the developmental process and is designated as an API standard.

5 Questions concerning theinterpretation of the content of this publication or comments and questions concerning the procedures under whichthis publication was developed should be directed in writing to the Director of Standards, American PetroleumInstitute, 1220 L Street, NW, Washington, DC 20005. Requests for permission to reproduce or translate all or any partof the material published herein should also be addressed to the , API standards are reviewed and revised, reaffirmed, or withdrawn at least every five years. A one-timeextension of up to two years may be added to this review cycle. Status of the publication can be ascertained from theAPI Standards Department, telephone (202) 682-8000. A catalog of API publications and materials is publishedannually by API, 1220 L Street, NW, Washington, DC revisions are invited and should be submitted to the Standards Department, API, 1220 L Street, NW,Washington, DC 20005, v Contents Page API Foreword.

6 Iii Foreword .. ix Introduction .. x 1 Scope .. 1 Purpose .. 1 Applicability .. 1 Service conditions .. 2 Product Specification levels .. 3 2 Normative references .. 6 3 Terms, definitions and abbreviated terms .. 8 Terms and definitions .. 8 Abbreviated terms .. 20 4 Design and performance General requirements .. 21 Performance requirements General .. 21 Service conditions .. 21 Design methods .. 24 Miscellaneous design information .. 28 Design documentation .. 29 Design review .. 29 Design validation .. 29 5 Materials General requirements .. 29 General .. 29 Written specifications .. 30 Mandrel tubing hangers and casing hangers .. 31 Bodies, bonnets and end and outlet connections .. 34 Ring gaskets .. 41 Test coupons .. 42 Qualification test coupons.

7 47 Heat-treating Equipment qualification .. 49 Material qualification .. 49 Pressure-boundary penetrations .. 49 Wear bushings .. 50 Clamp hub-end connectors .. 50 6 Welding General requirements .. 50 General .. 50 Non-pressure-containing weldments other than weld overlays PSL 1 to PSL 3 .. 50 Pressure-containing fabrication weldments for bodies, bonnets, end and outlet connections, bullplugs, valve-removal plugs and back-pressure 50 Pressure-containing repair weldments for bodies, bonnets, end and outlet connections, bullplugs, valve-removal plugs and back-pressure 56 Weld overlay for corrosion resistance and/or hard facing and other material surface property 58 7 Quality control .. 62 General .. 62 Measuring and testing Equipment .. 62 Quality-control personnel qualifications.

8 62 Quality control requirements .. 63 Quality control records requirements .. 103 8 Equipment marking .. 108 Marking requirements .. 108 vi Wellhead Equipment .. 110 Connectors and fittings .. 110 Casing and tubing hangers .. 110 Valves and chokes .. 111 Loose connectors [flanged, threaded, other end connectors (OEC) and welded] .. 112 Other Equipment .. 112 Studs and nuts .. 113 Christmas trees .. 113 Valve-removal plugs .. 114 Bullplugs .. 114 Back-pressure valves .. 114 9 Storing and shipping .. 114 Draining after testing .. 114 Rust prevention .. 114 Sealing-surface protection .. 114 Assembly and maintenance instructions .. 114 Ring gaskets .. 114 Age control of non-metallic materials .. 114 10 Equipment -specific requirements .. 115 Flanged end and outlet connections.

9 115 Threaded end and outlet connections .. 151 Studs and nuts .. 157 Ring gaskets .. 159 Valves .. 167 Casing and tubing heads .. 180 Casing and tubing hangers .. 185 Tubing-head adapters .. 191 Chokes .. 193 Tees and crosses .. 196 Test and gauge connections for 103,5 MPa and 138,0 MPa (15 000 psi and 20 000 psi) Equipment .. 201 Fluid sampling devices .. 203 Christmas trees .. 204 Cross-over connectors .. 204 Adapter and spacer spools .. 209 Actuators .. 210 Packing mechanisms for lock screws, alignment pins and retainer screws .. 215 Other end connectors .. 216 Top connectors .. 217 Surface and underwater safety valves and actuators .. 218 Bullplugs .. 224 Valve-removal plugs .. 227 Other pressure-boundary penetrations .. 228 Back-pressure valves.

10 228 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.