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API Spec 6A:2010
Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition (ISO 10423:2009 Modification), Includes Errata (through Errata 8, February 2016), Addenda 1(Nov 2011), 2 (Nov 2012), 3 (March 2013) and 4 (June 2016)
454 стр.
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This document 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 document does not apply to field use, field testing or field repair of wellhead and christmas tree equipment.

This document is applicable to the following specific equipment: wellhead equipment (casing head housings, casing head spools, tubing head spools, cross-over spools, multi-stage head housings and spools); connectors and fittings (cross-over connectors, tubing head adapters, top connectors, tees and crosses, fluid-sampling devices, adapter and spacer spools); casing and tubing hangers (mandrel hangers, slip hangers); 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); loose connectors (weld neck connectors, blind connectors, threaded connectors, adapter and spacer connectors, bullplugs, valve-removal plugs); and other equipment (actuators, hubs, pressure boundary penetrations, ring gaskets, running and testing tools, wear bushings).

This document defines service conditions, in terms of pressure, temperature and material class for the well-bore constituents, and operating conditions. This International Standard establishes requirements for five product specification levels (PSL). These five PSL designations define different levels of technical quality requirements.

This edition of Spec 6A is the modified national adoption of ISO 10423:2009, Petroleum and natural gas industries-Drilling and production equipment-Wellhead and christmas tree equipment. This specification contains the API Monogram Annex as part of the U.S. national adoption.

This product references:

ISO 31-0:1992, ISO 148-1:2009, ISO 2859-1:1999, ISO 6506-2:2005, ISO 6506-1:2005, ISO 6506-3:2005, ISO 6507-1:2005, ISO 6507-2:2005, ISO 6507-3:2005, ISO 6508-2:2005, ISO 6508-1:2005, ISO 6508-3:2005, ISO 9712:2005, ISO 10414-1:2008, ISO 10424-1:2004, ISO 11960:2004, ISO 13533:2001, ISO 13628-4:1999, ISO 13678:2009, ISO 15156-2:2009, ISO 15156-3:2009, ISO 15156-1:2009, ISO 18265:2003.


API Foreword



1 Scope

2 Normative references

3 Terms, definitions and abbreviated terms

4 Design and performance — General requirements

5 Materials — General requirements

6 Welding — General requirements

7 Quality control

8 Equipment marking

9 Storing and shipping

10 Equipment-specific requirements

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

Annex H (normative) Design and manufacture of surface wellhead running, retrieving and testing

tools, clean-out tools and wear bushings

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


Annex J (normative) Repair and remanufacture requirements

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

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

handling tools

Annex M (informative) Qualification of heat-treating equipment

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

Annx O (informative) API Regional Annex

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