EN ISO 10423:2009

Foreword
Introduction
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 valves
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
Bibliography

ISO 10423:2009 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.ISO 10423:2009 does not apply to field use, field testing or field repair of wellhead and christmas tree equipment.ISO 10423:2009 is applicable to specific types of wellhead equipment, connectors and fittings; casing and tubing hangers; valves and chokes; loose connectors [flanged, threaded, other end connectors (OEC), and welded]; and other equipment, such as actuators, clamp hubs, pressure boundary penetrations, ring gaskets, running and testing tools and wear bushings.The nomenclature is defined and most physical dimensions are given in USC as well as metric units.ISO 10423:2009 defines service conditions, in terms of pressure, temperature and material class for the well-bore constituents, and operating conditions.ISO 10423:2009 establishes requirements for five product specification levels, PSL 1, 2, 3, 3G and 4. These five PSL designations define different levels of technical quality requirements. Guidelines (not requirements) are provided for selecting an acceptable PSL.