1.1 Purpose
This 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 Standard does not apply to field use, field testing or field repair of wellhead and christmas tree equipment.
1.2 Applicability
This Standard is applicable to the following specific equipment.
a) Wellhead equipment:
1) casing head housings;
2) casing head spools;
3) tubing head spools;
4) cross-over spools;
5) multi-stage head housings and spools.
b) Connectors and fittings:
1) cross-over connectors;
2) tubing head adapters;
3) top connectors;
4) tees and crosses;
5) fluid-sampling devices;
6) adapter and spacer spools.
c) Casing and tubing hangers:
1) mandrel hangers;
2) slip hangers.
d) Valves and chokes:
1) single valves;
2) multiple valves;
3) actuated valves;
4) valves prepared for actuators;
5) check valves;
6) chokes;
7) surface and underwater safety valves and actuators;
8) back-pressure valves.
e) Loose connectors [flanged, threaded, other end connectors (OEC), and welded]:
1) weld neck connectors;
2) blind connectors;
3) threaded connectors;
4) adapter and spacer connectors;
5) bullplugs;
6) valve-removal plugs.
f) Other equipment:
1) actuators;
2) hubs;
3) pressure boundary penetrations;
4) ring gaskets;
5) running and testing tools (in Appendix H);
6) wear bushings (in Appendix H).
The nomenclature used in this Standard for typical equipment is shown in Figure 1 and Figure 2. All parts whose physical dimensions conform to the metric tables incorporated into the body of this Standard.
Foreword IV
1 Scope 1
1.1 Purpose 1
1.2 Applicability 1
1.3 Service conditions 4
1.4 Product specification levels (PSL) 4
2 Normative References 5
3 Terms, Definitions and Abbreviated Terms 7
3.1 Terms and definitions 7
3.2 Abbreviated terms 20
4 Design and Performance — General Requirements 21
4.1 Performance requirements — General 21
4.2 Service conditions 21
4.3 Design methods 23
4.4 Miscellaneous design information 27
4.5 Design documentation 28
4.6 Design review 28
4.7 Design verification 28
5 Materials — General requirements 28
5.1 General 28
5.2 Written specifications 29
5.3 Mandrel tubing and casing hangers 29
5.4 Bodies, bonnets, end and outlet connections 32
5.5 Ring gaskets 38
5.6 Test coupons (TC) 39
5.7 Qualification test coupons (QTC) 42
5.8 Heat-treating equipment qualification 44
5.9 Material qualification 45
5.10 Bullplugs and valve-removal plugs 45
5.11 Back-pressure valves 45
5.12 Pressure-boundary penetrations 45
5.13 Wear bushings 45
5.14 Hub-end connectors 45
6 Welding — General Requirements 46
6.1 General 46
6.2 Non-pressure-containing weldments other than weld overlays (PSL 1 to PSL 3) 46
6.3 Pressure-containing fabrication weldments for bodies, bonnets, end and outlet connections, bullplugs, valve-removal plugs and back-pressure valves 47
6.4 Pressure-containing repair weldments for bodies, bonnets, end and outlet connections, bullplugs, valve-removal plugs and back-pressure valves 52
6.5 Weld overlay for corrosion resistance and/or hard facing and other material surface property controls 53
7 Quality Control 56
7.1 General 56
7.2 Measuring and testing equipment 57
7.3 Quality control personnel qualifications 57
7.4 Quality control requirements 57
7.5 Quality control records requirements 88
8 Equipment marking 93
8.1 Marking requirements 93
8.2 Wellhead equipment 94
8.3 Connectors and fittings 96
8.4 Casing and tubing hangers 96
8.5 Valves and chokes 96
8.6 Loose connectors [flanged, threaded, other end connectors (OEC) and welded] 97
8.7 Other equipment 97
8.8 Studs and nuts 98
8.9 Christmas trees 99
8.10 Valve-removal plugs 99
8.11 Bullplugs 99
8.12 Back-pressure valves 99
9 Storing and Shipping 99
9.1 Draining after testing 99
9.2 Rust prevention 99
9.3 Sealing surface protection 99
9.4 Assembly and maintenance instructions 99
9.5 Ring gaskets 99
9.6 Age control of non-metallic materials 100
10 Equipment-specific Requirements 100
10.1 Flanged end and outlet connections 100
10.2 Threaded end and outlet connections 133
10.3 Studs and nuts 138
10.4 Ring gaskets 140
10.5 Valves 144
10.6 Casing and tubing heads 157
10.7 Casing and tubing hangers 161
10.8 Tubing-head adapters 166
10.9 Chokes 168
10.10 Tees and crosses 171
10.11 Test and gauge connections for 103.5 MPa and 138.0 MPa equipment 177
10.12 Fluid sampling devices 177
10.13 Christmas trees 180
10.14 Cross-over connectors 180
10.15 Adapter and spacer spools 184
10.16 Actuators 185
10.17 Packing mechanisms for lock screws, alignment pins and retainer screws 188
10.18 Other end connectors (OECs) 189
10.19 Top connectors 190
10.20 Surface and underwater safety valves and actuators 191
10.21 Bullplugs 196
10.22 Valve-removal plugs 199
10.23 Other pressure-boundary penetrations 199
10.24 Back-pressure valves 200
11 Repair and remanufacture 200
Appendix A (Informative) Purchasing Guidelines 201
Appendix B (Informative) Comparison Between the Domestic and Foreign Standards 221
Appendix C (Normative) Performance Verification Procedures for Surface Safety Valves and Underwater Safety Valves 229
Appendix D (Informative) Design and rating of equipment for use at elevated temperatures 238
Appendix E (Informative) Performance verification procedures 241
Appendix F (Informative) Recommended Weld Groove Design 274
Appendix G (Normative) Design and Manufacture of Surface Wellhead Running, Retrieving and Testing Tools, Clean-out Tools and Wear Bushings 279
Appendix H (Normative) SI Flanged-connection Nuts 283
Appendix I (Informative) Method of calculating stud bolt lengths for type 6B and 6BX flanges 285
Appendix J (Informative) Recommended Flange Bolt Torque 287
Appendix K (Normative) Specifications for Valve-removal Preparations and Valve-removal Plugs 292
Appendix L (Informative) Recommended Specifications for Top Connectors for Christmas Trees 303
Appendix M 3) (Normative) Repair and Remanufacture Requirements 312
Appendix N4) (Normative) Technical Modification for API Spec 6A (Edition 19) 324
Appendix O (Informative) 336
U.S. Customary Units and Data Corresponding to This Standard 336
Appendix P (Informative) Comparison Between Chapter and Article Numbers of This Standard and ISO 10423: 2003 341
Bibliography 348
