API 6A: Specification for Wellhead and Christmas Tree Equipment

Click here to see a preview of the code

Wellhead and christmas tree equipment

Content Page
API FOREWORD ........................................................................................................................................................... ii
ISO FOREWORD ........................................................................................................................................................... vi
ISO INTRODUCTION ................................................................................................................................................... vii
1 SCOPE ..................................................................................................................................................................... 1
1.1 Purpose .......................................................................................................................................................... 1
1.2 Applicability .................................................................................................................................................. 1
1.3 Service conditions ....................................................................................................................................... 2
1.4 Product specification levels (PSL) ............................................................................................................. 3
2 NORMATIVE REFERENCES .................................................................................................................................. 6
3 TERMS, DEFINITIONS AND ABBREVIATED TERMS .......................................................................................... 8
3.1 Terms and definitions .................................................................................................................................. 8
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 ................................................................................................................................ 28
5.3 Mandrel tubing and casing ......................................................................................................................... 29
5.4 Bodies, bonnets, end and outlet connections ........................................................................................ 32
5.5 Ring gaskets ............................................................................................................................................... 39
5.6 Test coupons (TC) ...................................................................................................................................... 40
5.7 Qualification test coupons (QTC) ............................................................................................................. 43
5.8 Heat-treating equipment qualification ...................................................................................................... 46
5.9 Material qualification .................................................................................................................................. 46
5.10 Bullplugs and valve-removal plugs .......................................................................................................... 46
5.11 Back-pressu re valves ................................................................................................................................ 46
5.12 Pressure-boundary penetrations .............................................................................................................. 46
5.13 Wear bushings ............................................................................................................................................ 46
5.14 Hub-end connectors .................................................................................................................................. 46
6 WELDING - GENERAL REQUIREMENTS ......................................................................................................... 47
6.1 General ........................................................................................................................................................ 47
6.2 Non-pressure-containing weldments other than weld overlays (PSL 1 to PSL 3) .............................. 47
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,
bull plugs, 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 ........................................................................................................................................ 54 7 QUALITY CONTROL ............................................................................................................................................. 5-
7.1 General ........................................................................................................................................................ 5',
7.2 Measuring and testing equipment ............................................................................................................ 57
7.3 Quality control personnel qualifications ................................................................................................. 58
7.4 Quality control requirements .................................................................................................................... 58
7.5 Quality control records requirements ...................................................................................................... 95
8 EQUIPMENT MARKING ...................................................................................................................................... 100
8.1 Marking requirements .............................................................................................................................. 100
8.2 Wellhead equipment ................................................................................................................................ 102
8.3 Connectors and fittings ........................................................................................................................... 102
8.4 Casing and tubing hangers ..................................................................................................................... 102
8.5 Valves and chokes ................................................................................................................................... 103
8.6 Loose connectors [flanged, threaded, other end connectors (OEC) and welded] ............................ 104
8.7 Other equipment ....................................................................................................................................... 104
8.8 Studs and nuts ......................................................................................................................................... 105
8.9 Christmas trees ........................................................................................................................................ 105
8.10 Valve-removal plugs ................................................................................................................................ 105
8.11 Bullplugs ................................................................................................................................................... 105
8.12 Back-pressure valves .............................................................................................................................. 106
9 STORING AND SHIPPING .................................................................................................................................. 106
9.1 Draining after testing ............................................................................................................................... 106
9.2 Rust prevention ........................................................................................................................................ 106
9.3 Sealing surface protection ...................................................................................................................... 106
9.4 Assembly and maintenance instructions .............................................................................................. 106
9.5 Ring gaskets ............................................................................................................................................. 106
9.6 Age control of non-metallic materials .................................................................................................... 10f
10 EQUIPMENT-SPECIFIC REQUIREMENTS ........................................................................................................ 107
10.1 Flanged end and outlet connections .................................................................................................. 107
10.2 Threaded end and outlet connections ................................................................................................ 140
10.3 Studs and nuts ...................................................................................................................................... 146
10.4 Ring gaskets .......................................................................................................................................... 148
10.5 Valves ..................................................................................................................................................... 154
10.6 Casing and tubing heads ..................................................................................................................... 169
10.7 Casing and tubing hangers .................................................................................................................. 174
10.8 Tubing-head adapters ........................................................................................................................... 179
10.9 Chokes ................................................................................................................................................... 181
10.10 Tees and crosses .................................................................................................................................. 184
10.11 Test and gauge connections for 103,5 MPa and 138,0 MPa (15 000 psi and 20 000 psi)
equipment .............................................................................................................................................. 189
10.12 Fluid sampling devices ......................................................................................................................... 189
10.13 Christmas trees ..................................................................................................................................... 192
10.14 Cross-over connectors ......................................................................................................................... 192
10.15 Adapter and spacer spools .................................................................................................................. 197
10.16 Actuators ............................................................................................................................................... 198
10.17
10.18
10.19
10.20
10.21
10.22
10.23
10.24
Lock screws, alignment pins and retainer screw packing mechanisms ........................................ 202
Other end connectors (OECs) ............................................................................................................. 203
Top connectors ..................................................................................................................................... 204
Surface and underwater safety valves and actuators for offshore service ..................................... 205
Bullplugs ................................................................................................................................................ 210
Valve-removal plugs ............................................................................................................................. 213
Other pressure-boundary penetrations .............................................................................................. 213
Back-pressure valves ........................................................................................................................... 214
11 REPAIR AND REMAN UF ACTURE ..................................................................................................................... 214
AN N EX A (informative) Purchasi ng gu idelines .............. " ................... ,................................................................... 215
ANNEX 8 (informative) US Customary unit tables and data for this International Standard ............................. 234 ANNEX C (informative) Method of calculating stud bolt lengths for type 6B and 6BX flanges ......................... 289
ANNEX D (informative) Recommended flange bolt torque .................................................................................... 291
ANNEX E (informative) Recommended weld groove design dimensions ............................................................ 295
ANNEX F (informative) Performance verification procedures ............................................................................... 299
ANNEX G (informative) Design and rating of equipment for use at elevated temperatures .............................. 333
ANNEX H (normative) Design and manufacture of surface wellhead running, retrieving and testing
tools, clean-out tools and wear bushings .............................................................................................................. 336
ANNEX I (normative) Performance verification procedures for surface safety valves and underwater
safety valves ............................................................................................................................................................. 341
ANNEX J WITHDRAWN .................................................................................................................................... 349
ANNEX K (informative) Recommended specifications for top connectors for christmas trees ........................ 362
ANNEX L (normative) Specifications for valve-removal preparations and valve-removal plugs ...................... 377
ANNEX M (informative) List of tables and figures .................................................................................................. 393
ANNEX N (informative) API Monogram and test agency licensing ......................................................................... 403
ANNEX 0 (normative) API regional annex ................................................................................................................ 404
ANNEX P (informative) Recommended practice for qualification of heat-treating equipment.. .......................... 414
Bibliography .............................................................................................................................................................. 417