UNI EN ISO 10423 : 2012

Foreword
Introduction
1 Scope
   1.1 Purpose
   1.2 Applicability
   1.3 Service conditions
   1.4 Product specification levels (PSL)
2 Normative references
3 Terms, definitions and abbreviated terms
   3.1 Terms and definitions
   3.2 Abbreviated terms
4 Design and performance - General requirements
   4.1 Performance requirements - General
   4.2 Service conditions
   4.3 Design methods
   4.4 Miscellaneous design information
   4.5 Design documentation
   4.6 Design review
   4.7 Design verification
5 Materials - General requirements
   5.1 General
   5.2 Written specifications
   5.3 Mandrel tubing and casing hangers
   5.4 Bodies, bonnets, end and outlet connections
   5.5 Ring gaskets
   5.6 Test coupons (TC)
   5.7 Qualification test coupons (QTC)
   5.8 Heat-treating equipment qualification
   5.9 Material qualification
   5.10 Bullplugs and valve-removal plugs
   5.11 Back-pressure valves
   5.12 Pressure-boundary penetrations
   5.13 Wear bushings
   5.14 Hub-end connectors
6 Welding - General requirements
   6.1 General
   6.2 Non-pressure-containing weldments other than weld
         overlays (PSL 1 to PSL 3)
   6.3 Pressure-containing fabrication weldments for bodies,
         bonnets, end and outlet connections, bullplugs,
         valve-removal plugs and back-pressure valves
   6.4 Pressure-containing repair weldments for bodies,
         bonnets, end and outlet connections, bullplugs,
         valve-removal plugs and back-pressure valves
   6.5 Weld overlay for corrosion resistance and/or hard
         facing and other material surface property controls
7 Quality control
   7.1 General
   7.2 Measuring and testing equipment
   7.3 Quality control personnel qualifications
   7.4 Quality control requirements
   7.5 Quality control records requirements
8 Equipment marking
   8.1 Marking requirements
   8.2 Wellhead equipment
   8.3 Connectors and fittings
   8.4 Casing and tubing hangers
   8.5 Valves and chokes
   8.6 Loose connectors [flanged, threaded, other end
         connectors (OEC) and welded]
   8.7 Other equipment
   8.8 Studs and nuts
   8.9 Christmas trees
   8.10 Valve-removal plugs
   8.11 Bullplugs
   8.12 Back-pressure valves
9 Storing and shipping
   9.1 Draining after testing
   9.2 Rust prevention
   9.3 Sealing surface protection
   9.4 Assembly and maintenance instructions
   9.5 Ring gaskets
   9.6 Age control of non-metallic materials
10 Equipment-specific requirements
   10.1 Flanged end and outlet connections
   10.2 Threaded end and outlet connections
   10.3 Studs and nuts
   10.4 Ring gaskets
   10.5 Valves
   10.6 Casing and tubing heads
   10.7 Casing and tubing hangers
   10.8 Tubing-head adapters
   10.9 Chokes
   10.10 Tees and crosses
   10.11 Test and gauge connections for 103,5 MPa and 138,0
         MPa (15 000 psi and 20 000 psi) equipment
   10.12 Fluid sampling devices
   10.13 Christmas trees
   10.14 Cross-over connectors
   10.15 Adapter and spacer spools
   10.16 Actuators
   10.17 Lock screws, alignment pins and retainer screw
         packing mechanisms
   10.18 Other end connectors (OECs)
   10.19 Top connectors
   10.20 Surface and underwater safety valves and actuators
   10.21 Bullplugs
   10.22 Valve-removal plugs
   10.23 Other pressure-boundary penetrations
   10.24 Back-pressure valves
11 Repair and remanufacture
Annex A (informative) Purchasing guidelines
Annex B (informative) US customary 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 groove design dimensions
Annex F (informative) Performance verification 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) Performance verification 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 and valve-removal plugs
Annex M (informative) List of tables and figures
Bibliography

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. Defines service conditions, in terms of pressure, temperature and material class for the well-bore constituents, and operating conditions. Establishes requirements for five product specification levels. Applicable to wellhead equipment; connectors and fittings; casing and tubing hangers; valves and chokes; loose connectors (flanged, threaded, other end connectors (OEC), and welded); other equipments.