EN ISO 10423:2009

SLOVENSKI STANDARD
01-februar-2010
1DGRPHãþD
SIST EN ISO 10423:2005
Industrija za predelavo nafte in zemeljskega plina - Vrtalna in proizvodna oprema -
Oprema za glavo izvrtine in erupcijski križ na ustjih vrtin (ISO 10423:2009)
Petroleum and natural gas industries - Drilling and production equipment - Wellhead and
christmas tree equipment (ISO 10423:2009)
Erdöl- und Erdgasindustrie - Bohr- und Förderausrüstung - Bohrlochkopf- und
Eruptionskreuz-Ausrüstung (ISO 10423:2009)
Industries du pétrole et du gaz naturel - Équipement de forage et de production -
Équipement pour têtes de puits et arbre de Noël (ISO 10423:2009)
Ta slovenski standard je istoveten z: EN ISO 10423:2009
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 10423
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2009
ICS 75.180.10 Supersedes EN ISO 10423:2004
English Version
Petroleum and natural gas industries - Drilling and production
equipment - Wellhead and christmas tree equipment (ISO
10423:2009)
Industries du pétrole et du gaz naturel - Équipement de Erdöl- und Erdgasindustrie - Bohr- und Förderausrüstung -
forage et de production - Équipement pour têtes de puits et Bohrlochkopf- und Eruptionskreuz-Ausrüstung (ISO
arbre de Noël (ISO 10423:2009) 10423:2009)
This European Standard was approved by CEN on 18 November 2009.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10423:2009: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 10423:2009) has been prepared by Technical Committee ISO/TC 67 “Materials,
equipment and offshore structures for petroleum, petrochemical and natural gas industries” in collaboration
with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures for petroleum,
petrochemical and natural gas industries” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by June 2010, and conflicting national standards shall be withdrawn at
the latest by June 2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 10423:2004.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 10423:2009 has been approved by CEN as a EN ISO 10423:2009 without any modification.

INTERNATIONAL ISO
STANDARD 10423
Fourth edition
2009-12-15
Petroleum and natural gas industries —
Drilling and production equipment —
Wellhead and christmas tree equipment
Industries du pétrole et du gaz naturel — Équipement de forage et
de production — Équipement pour têtes de puits et arbre de Noël

Reference number
ISO 10423:2009(E)
©
ISO 2009
ISO 10423:2009(E)
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©  ISO 2009
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ii © ISO 2009 – All rights reserved

ISO 10423:2009(E)
Contents Page
Foreword .vi
Introduction.vii
1 Scope.1
1.1 Purpose .1
1.2 Applicability .1
1.3 Service conditions.2
1.4 Product specification levels.3
2 Normative references.6
3 Terms, definitions and abbreviated terms.8
3.1 Terms and definitions .8
3.2 Abbreviated terms .21
4 Design and performance — General requirements .21
4.1 Performance requirements — General.21
4.2 Service conditions.22
4.3 Design methods.25
4.4 Miscellaneous design information .29
4.5 Design documentation.30
4.6 Design review .30
4.7 Design validation.30
5 Materials — General requirements .30
5.1 General .30
5.2 Written specifications .31
5.3 Mandrel tubing hangers and casing hangers.31
5.4 Bodies, bonnets and end and outlet connections .35
5.5 Ring gaskets .42
5.6 Test coupons .43
5.7 Qualification test coupons .48
5.8 Heat-treating equipment qualification.50
5.9 Material qualification.50
5.10 Pressure-boundary penetrations.50
5.11 Wear bushings.51
5.12 Clamp hub-end connectors.51
6 Welding — General requirements.51
6.1 General .51
6.2 Non-pressure-containing weldments other than weld overlays — PSL 1 to PSL 3 .51
6.3 Pressure-containing fabrication weldments for bodies, bonnets, end and outlet
connections, bullplugs, valve-removal plugs and back-pressure valves .51
6.4 Pressure-containing repair weldments for bodies, bonnets, end and outlet connections,
bullplugs, valve-removal plugs and back-pressure valves.57
6.5 Weld overlay for corrosion resistance and/or hard facing and other material surface
property controls.59
7 Quality control .63
7.1 General .63
7.2 Measuring and testing equipment .63
7.3 Quality-control personnel qualifications .63
7.4 Quality control requirements .64
7.5 Quality control records requirements.104
8 Equipment marking .109
ISO 10423:2009(E)
8.1 Marking requirements .109
8.2 Wellhead equipment.111
8.3 Connectors and fittings .111
8.4 Casing and tubing hangers .111
8.5 Valves and chokes.112
8.6 Loose connectors [flanged, threaded, other end connectors (OEC) and welded] .113
8.7 Other equipment .113
8.8 Studs and nuts.114
8.9 Christmas trees.114
8.10 Valve-removal plugs.115
8.11 Bullplugs.115
8.12 Back-pressure valves.115
9 Storing and shipping.115
9.1 Draining after testing.115
9.2 Rust prevention.115
9.3 Sealing-surface protection .115
9.4 Assembly and maintenance instructions.115
9.5 Ring gaskets.115
9.6 Age control of non-metallic materials .115
10 Equipment-specific requirements.116
10.1 Flanged end and outlet connections .116
10.2 Threaded end and outlet connections.152
10.3 Studs and nuts.158
10.4 Ring gaskets.160
10.5 Valves.168
10.6 Casing and tubing heads .181
10.7 Casing and tubing hangers .186
10.8 Tubing-head adapters .192
10.9 Chokes .194
10.10 Tees and crosses.197
10.11 Test and gauge connections for 103,5 MPa and 138,0 MPa (15 000 psi and 20 000 psi)
equipment.202
10.12 Fluid sampling devices .204
10.13 Christmas trees.205
10.14 Cross-over connectors .205
10.15 Adapter and spacer spools.210
10.16 Actuators .211
10.17 Packing mechanisms for lock screws, alignment pins and retainer screws .216
10.18 Other end connectors .217
10.19 Top connectors.218
10.20 Surface and underwater safety valves and actuators.219
10.21 Bullplugs.225
10.22 Valve-removal plugs.228
10.23 Other pressure-boundary penetrations.229
10.24 Back-pressure valves.229
11 Repair and remanufacture .230
Annex A (informative) Purchasing guidelines.231
Annex B (informative) USC unit tables and data for this International Standard.250
Annex C (informative) Method of calculating stud bolt lengths for type 6B and 6BX flanges.308
Annex D (informative) Recommended flange bolt torque.310
Annex E (informative) Recommended weld preparation design dimensions.314
Annex F (informative) Design validation procedures .318
Annex G (informative) Design and rating of equipment for use at elevated temperatures.353
iv © ISO 2009 – All rights reserved

ISO 10423:2009(E)
Annex H (normative) Design and manufacture of surface wellhead running, retrieving and testing
tools, clean-out tools and wear bushings.357
Annex I (normative)  Design validation procedures for surface safety valves and underwater
safety valves .361
Annex J (normative) Repair and remanufacture requirements.369
Annex K (informative) Recommended specifications for top connectors for christmas trees .383
Annex L (normative) Specifications for valve-removal preparations, valve-removal plugs and
handling tools .397
Annex M (informative) Qualification of heat-treating equipment.417
Annex N (informative) List of tables and list of figures .420
Bibliography.430

ISO 10423:2009(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 10423 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries, Subcommittee SC 4, Drilling and production
equipment.
This fourth edition cancels and replaces the third edition (ISO 10423:2003), which has been technically
revised.
vi © ISO 2009 – All rights reserved

ISO 10423:2009(E)
Introduction
This International Standard, which has been technically revised, is based on API Spec 6A, nineteenth edition,
July 2004 and its addendums and errata, and API Spec 6AV1, first edition, February 1996 and its errata, with
the intent that the twentieth edition of API Spec 6A will be identical to this International Standard.
The International System of units (SI) is used in this International Standard. However, nominal sizes are
shown as fractions in the inch system.
The fractions and their decimal equivalents are equal and interchangeable. Metric conversions and inch
dimensions in this International Standard are based on the original fractional inch designs. Functional
dimensions have been converted into the metric system to ensure interchangeability of products
manufactured in metric or inch systems; see also Annex B.
Tables referenced in the main body of this International Standard that are marked with an asterisk (*) are
repeated in Annex B in US Customary (USC) units with the same table number as in the main body but with
the prefix B. In figures where dimensions are given only in inches, the values of surface roughness have been
indicated in accordance with US draughting conventions.
It is necessary that users of this International Standard be aware that further or differing requirements can be
needed for individual applications. This International Standard is not intended to inhibit a vendor from offering,
or the purchaser from accepting, alternative equipment or engineering solutions for the individual application.
This can be particularly applicable where there is innovative or developing technology. Where an alternative is
offered, it is the responsibility of the vendor to identify any variations from this International Standard and
provide details.
INTERNATIONAL STANDARD ISO 10423:2009(E)

Petroleum and natural gas industries — Drilling and production
equipment — Wellhead and christmas tree equipment
1 Scope
1.1 Purpose
This International 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 International Standard does not apply to field use, field testing or field repair of wellhead and christmas
tree equipment.
1.2 Applicability
This International Standard is applicable to the following specific equipment:
a) wellhead equipment:
⎯ casing-head housings,
⎯ casing-head spools,
⎯ tubing-head spools,
⎯ cross-over spools,
⎯ multi-stage head housings and spools;
b) connectors and fittings:
⎯ cross-over connectors,
⎯ tubing-head adapters,
⎯ top connectors,
⎯ tees and crosses,
⎯ fluid-sampling devices,
⎯ adapter and spacer spools;
c) casing and tubing hangers:
⎯ mandrel hangers,
⎯ slip hangers;
ISO 10423:2009(E)
d) 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;
e) loose connectors [flanged, threaded, other end connectors (OEC), and welded]:
⎯ weld neck connectors,
⎯ blind connectors,
⎯ threaded connectors,
⎯ adapter and spacer connectors,
⎯ bullplugs,
⎯ valve-removal plugs;
f) other equipment:
⎯ actuators,
⎯ clamp hubs,
⎯ pressure boundary penetrations,
⎯ ring gaskets,
⎯ running and testing tools (see Annex H),
⎯ wear bushings (see Annex H).
The nomenclature used in this International Standard for typical equipment is shown in Figures 1 and 2. All
parts whose physical dimensions conform to the metric tables incorporated into the body of this International
Standard or to the tables in USC units in Annex B are acceptable; see Introduction.
1.3 Service conditions
This International Standard defines service conditions, in terms of pressure, temperature and material class
for the well-bore constituents, and operating conditions.
2 © ISO 2009 – All rights reserved

ISO 10423:2009(E)
1.4 Product specification levels
This International Standard establishes requirements for five product specification levels (PSLs): PSL 1, 2, 3,
3G and 4. These five PSL designations define different levels of technical quality requirements. Annex A
provides guidelines (not requirements) for selecting an acceptable PSL.

Key
1 back-pressure valve preparation 12 double-studded adapter
2 subsurface safety valve control line 13 annular casing pack-off
3 subsurface safety valve control line outlet 14 casing hanger (slip style)
4 tubing-head adapter 15 threaded outlet connection
5 lock screw 16 bullplug
6 tubing hanger pack-off 17 casing-head housing
7 extended neck tubing hanger with subsurface safety valve control line 18 surface casing
8 studded side outlet 19 wellhead support plate
9 valve-removal preparation 20 tubing pack-off retainer
10 bottom casing pack-off 21 tubing hanger (slip style)
11 tubing-head spool 22 tubing
Figure 1 — Typical wellhead assembly nomenclature (continued)
ISO 10423:2009(E)
Key
23 studded side-outlet connection 29 casing-head spool
24 extended neck tubing hanger seal 30 inner casing
25 annular tubing hanger seal 31 intermediate casing
26 tubing hanger mandrel 32 flanged end connection
27 flanged outlet connection 33 tubing hanger mandrel seals
28 casing hanger mandrel 34 wrap-around hanger pack-off
Figure 1 — Typical wellhead assembly nomenclature

4 © ISO 2009 – All rights reserved

ISO 10423:2009(E)
Key
1 gauge valve 8 wing valve (manual or actuated)
2 bonnet nut 9 choke
3 blanking plug 10 surface safety valve
4 body 11 actuator
5 top connector 12 master valve
6 swab or crown valve 13 tubing-head adapter
7 tee
Figure 2 — Typical christmas tree nomenclature
ISO 10423:2009(E)
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 31-0, Quantities and units — Part 0: General principles
ISO 148 (all parts), Metallic materials — Charpy pendulum impact test
ISO 2859-1:1999, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 6506 (all parts), Metallic materials — Brinell hardness test
ISO 6507 (all parts), Metallic materials — Vickers hardness test
ISO 6508 (all parts), Metallic materials — Rockwell hardness test
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 9712, Non-destructive testing — Qualification and certification of personnel
ISO 10414-1, Petroleum and natural gas industries — Field testing of drilling fluids — Part 1: Water-based
fluids
ISO 10424-1:2004, Petroleum and natural gas industries — Rotary drilling equipment — Part 1: Rotary drill
stem elements
ISO 11960, Petroleum and natural gas industries — Steel pipes for use as casing or tubing for wells
ISO 13533, Petroleum and natural gas industries — Drilling and production equipment — Drill-through
equipment
ISO 13628-4, Petroleum and natural gas industries — Design and operation of subsea production systems —
Part 4: Subsea wellhead and tree equipment
ISO 13678, Petroleum and natural gas industries — Evaluation and testing of thread compounds for use with
casing, tubing, line pipe and drill stem elements
ISO 15156 (all parts), Petroleum and natural gas industries — Materials for use in H2S-containing
environments in oil and gas production
NOTE In this International Standard, ISO 15156 (all parts) and NACE MR0175 provide the same technical result for a
particular provision. In the running text the provision is written in the form “ISO 15156 (NACE MR0175; see Clause 2)”.
ISO 18265, Metallic materials — Conversion of hardness values
1)
API Spec 5B, Specification for Threading, Gauging and Thread Inspection of Casing, Tubing, and Line Pipe
Threads
API Spec 6AV1, Specification for Verification Test of Wellhead Surface Safety Valves and Underwater Safety
Valves for Offshore Service
API Spec 7:2001, Specification for Rotary Drill Stem Elements

1) American Petroleum Institute, 1220 L Street North West, Washington, DC 20005, USA.
6 © ISO 2009 – All rights reserved

ISO 10423:2009(E)
API RP 14F, Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore
Petroleum Facilities for Unclassified and Class 1, Division 1 and Division 2 Locations
2)
ASME B1.1, Unified Inch Screw Threads (UN and UNR Thread Form)
ASME B1.2, Gages and Gaging for Unified Inch Screw Threads
ASME B1.3, Screw Thread Gaging Systems for Acceptability: Inch and Metric Screw Threads (UN, UNR, UNJ,
M, and MJ)
ASME B1.5, ACME Screw Threads
ASME B1.20.1, Pipe Threads, General Purpose (Inch)
ASME Boiler and Pressure Vessel Code:2004 with 2005 and 2006 addenda, Section V, Nondestructive
Examination
ASME Boiler and Pressure Vessel Code:2004 with 2005 and 2006 addenda, Section VIII, Division 1, Rules for
Construction of Pressure Vessels
ASME Boiler and Pressure Vessel Code:2004 with 2005 and 2006 addenda, Section VIII, Division 2,
Alternative Rules
ASME Boiler and Pressure Vessel Code:2004 with 2005 and 2006 addenda, Section IX, Welding and Brazing
Qualifications
3)
ASNT SNT-TC-1A, Non-Destructive Testing
4)
ASTM A193/A193M, Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for
High Temperature or High Pressure Service and Other Special Purpose Applications
ASTM A194/A194M, Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or
High Temperature Service, or Both
ASTM A320/A320M, Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for Low-
Temperature Service
ASTM A370, Standard Test Methods and Definitions for Mechanical Testing of Steel Products
ASTM A388/A388M, Standard Practice for Ultrasonic Examination of Heavy Steel Forgings
ASTM A453/A453M, Standard Specification for High-Temperature Bolting Materials, with Expansion
Coefficients Comparable to Austenitic Stainless Steels
ASTM A703/A703M-08a, Standard Specification for Steel Castings, General Requirements, for Pressure-
Containing Parts
ASTM D395, Standard Test Methods for Rubber Property — Compression Set
ASTM D412, Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers — Tension
ASTM D471, Standard Test Method for Rubber Property — Effect of Liquids
ASTM D1414, Standard Test Methods for Rubber O-Rings

th
2) ASME International, 345 East 47 Street, New York, NY 10017-2392, USA.
3) American Society for Nondestructive Testing, 4153 Arlingate Plaza, Columbus, OH 43228-0518, USA.
4) American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohoken, PA 19428-2959, USA.
ISO 10423:2009(E)
ASTM D1415, Standard Test Method for Rubber Property — International Hardness
ASTM D1418, Standard Practice for Rubber and Rubber Latices — Nomenclature
ASTM D2240, Standard Test Method for Rubber Property — Durometer Hardness
ASTM E10, Standard Test Method for Brinell Hardness of Metallic Materials
ASTM E18, Standard Test Methods for Rockwell Hardness of Metallic Materials
ASTM E92, Standard Test Method for Vickers Hardness of Metallic Materials
ASTM E94, Standard Guide for Radiographic Examination
ASTM E140, Standard Hardness Conversion Tables for Metals — Relationship Among Brinell Hardness,
Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness and Scleroscope Hardness
ASTM E165, Standard Practice for Liquid Penetrant Examination for General Industry
ASTM E428, Standard Practice for Fabrication and Control of Metal, Other than Aluminum, Reference Blocks
Used in Ultrasonic Testing
ASTM E709, Standard Guide for Magnetic Particle Testing
ASTM E747, Standard Practice for Design, Manufacture and Material Grouping Classification of Wire Image
Quality Indicators (IQI) Used for Radiology
5)
EN 473, Non-destructive testing — Qualification and certification of NDT personnel — General principles
6)
MSS SP-55, Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other Piping
Components — Visual Method for Evaluation of Surface Irregularities
7)
SAE AMS-H-6875, Heat treatment of steel raw materials
SAE AS 568A:1974, Aerospace size standard for O-rings
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
acceptance criteria
defined limits placed on characteristics of materials, products or services
3.1.2
accessible wetted surface
wetted surface for purposes of non-destructive examination that can be viewed by direct line of sight
NOTE This excludes test ports, control line ports, lockdown screw holes and other penetrations of these types.

5) European Committee for Standardization, rue de Stassart 36, Brussels B-1050, Belgium.
6) Manufacturers Standardization Society of the Valve & Fittings Industry, 127 Park Street, N.E., Vienna, VA 22180, USA.
7) SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, USA.
8 © ISO 2009 – All rights reserved

ISO 10423:2009(E)
3.1.3
actuator
mechanism for the remote or automatic operation of a valve or choke
3.1.4
adapter
pressure-containing piece of equipment having end connections of different nominal sizes and/or pressure
ratings, used to connect other pieces of equipment of different nominal sizes and/or pressure ratings
3.1.5
annular pack-off
mechanism that seals off annular pressure between the outside diameter of a suspended tubular member or
hanger and the inside diameter of the head or spool through which the tubular member passes or hanger is
suspended
3.1.6
as-shipped condition
condition of the product or equipment when it is ready for shipment
3.1.7
back-pressure valve
unidirectional or bidirectional check valve that is installed through the christmas tree, into the tubing hanger,
and prevents well fluids from flowing out of the well
3.1.8
blind flange
flange with no centre bore, used to close off completely a flanged end or outlet connection
3.1.9
body
any portion of wellhead and christmas tree equipment between end connections, with or without internal parts,
which contains well-bore pressure
3.1.10
bonnet
pressure-containing closure for a body, other than an end or outlet connection
3.1.11
bottom casing pack-off
mechanism that seals off annular pressure between the outside diameter of a suspended tubular member or
hanger and the inside diameter of the spool or tubing-head adapter placed over the suspended tubular or
hanger
3.1.12
bullplug
pressure-containing closure for a female-threaded end or outlet connection, which may have an internal
counter-bore and/or test port
3.1.13
calibration
comparison and adjustment to a standard of known accuracy
3.1.14
carbon steel
alloy of carbon and iron containing a maximum of 2 % mass fraction carbon, 1,65 % mass fraction manganese,
and residual quantities of other elements, except those intentionally added in specific quantities for
deoxidation (usually silicon and/or aluminium)
ISO 10423:2009(E)
3.1.15
casing
pipe run from the surface and intended to line the walls of a drilled hole
3.1.16
casing hanger mandrel
mechanism used to support a casing string in a casing head by means of a male or female thread attached to the
casing
3.1.17
casing-head housing
equipment attached to the uppermost end of the surface casing, which serves to suspend and seal a casing
string
3.1.18
casing-head spool
equipment attached to another casing head, which serves to suspend and seal a secondary casing string
3.1.19
casting, noun
object at or near finished shape obtained by solidification of a fluid substance in a mould
NOTE HIP components are not considered to be a casting.
3.1.20
certificate of compliance
document containing the statement by the manufacturer, or repairer/remanufacturer certifying that the
equipment, repair, rework or remanufacture meets the requirements of this International Standard
3.1.21
certificate of conformance
document certifying that the repaired/remanufactured equipment and all of its component parts meet the
requirements of the original product definition
3.1.22
check valve
valve that permits fluid to flow freely in one direction and contains a mechanism to automatically prevent flow
in the other direction
3.1.23
chemical analysis
determination of the chemical composition of material
3.1.24
choke
equipment used to restrict and control the flow of fluids
3.1.25
choke bean
flow bean
replaceable orifice part used in positive chokes to control flow rate
3.1.26
choke trim
pressure-controlling choke component, including choke beans, used to control or regulate the flow of fluids
3.1.27
christmas tree
assembly of equipment, including tubing-head adapters, valves, tees, crosses, top connectors and chokes
attached to the uppermost connection of the tubing head, used to control well production
10 © ISO 2009 – All rights reserved

ISO 10423:2009(E)
3.1.28
clamp hub
protruding rim with an external angled shoulder and a sealing mechanism used to join pressure-containing
equipment
3.1.29
closure bolting
threaded fastener used to assemble well-bore pressure-containing parts or join end or outlet connections
EXAMPLES Studs, nuts, bolts and capscrews.
3.1.30
conformance
compliance with specified requirements
3.1.31
corrosion-resistant alloy
CRA
nonferrous-based alloy in which any one or the sum of the specified amount of the elements titanium, nickel,
cobalt, chromium, and molybdenum exceeds 50 % mass fraction
NOTE This definition is different from that in ISO 15156 (NACE MR0175; see Clause 2).
3.1.32
corrosion-resistant ring groove
ring groove lined with a CRA or an austenitic stainless steel to resist metal-loss corrosion
3.1.33
cross
pressure-containing fitting with a minimum of four openings
3.1.34
cross-over connector
adapter with a restricte
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