SIST EN ISO 10423:2002

SLOVENSKI STANDARD
01-januar-2002
Petroleum and natural gas industries - Drilling and production equipment -
Wellhead and christmas tree equipment (ISO 10423:2001)
Petroleum and natural gas industries - Drilling and production equipment - Wellhead and
christmas tree equipment (ISO 10423:2001)
Erdöl- und Erdgasindustrie - Bohr- und Förderausrüstung - Bohrlochkopf- und
Eruptionskreuz-Ausrustung (ISO 10423:2001)
Indutries du pétrole et du gaz naturel - Equipement de forage et de production -
Equipement pour tetes de puits et arbre de Noël (ISO 10423:2001)
Ta slovenski standard je istoveten z: EN ISO 10423:2001
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
August 2001
ICS 07.018.10
English version
Petroleum and natural gas industries - Drilling and production
equipment - Wellhead and christmas tree equipment (ISO
10423:2001)
Indutries du pétrole et du gaz naturel - Equipement de Erdöl- und Erdgasindustrie - Bohr- und Förderausrüstung -
forage et de production - Equipement pour têtes de puits et Bohrlochkopf- und Eruptionskreuz-Ausrustung (ISO
arbre de Noël (ISO 10423:2001) 10423:2001)
This European Standard was approved by CEN on 1 August 2001.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10423:2001 E
worldwide for CEN national Members.

CORRECTED  2002-11-20
Foreword
This document (ISO 10423:2001) has been prepared by Technical Committee ISO/TC 67
"Materials, equipment and offshore structures for petroleum and natural gas industries" in
collaboration with Technical Committee CEN/TC 12 "Materials, equipment and offshore
structures for petroleum 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 February 2002, and conflicting national
standards shall be withdrawn at the latest by February 2002.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,
Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 10423:2001 has been approved by CEN as EN ISO 10423:2001 without any
modifications.
NOTE Normative references to International Standards are listed in Annex ZA (normative).
Annex ZA
(normative)
Normative references to international publications
with their relevant European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of
any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
NOTE Where an International Publication has been modified by common modifications, indicated
by (mod.), the relevant EN/HD applies.
Publication Year Title EN Year
ISO 13533 2001 Petroleum and natural gas EN ISO 13533 2001
industries - Drilling and
production equipment - Drill-
through equipment
ISO 13628-4 1999 Petroleum and natural gas EN ISO 13628-4 1999
industries - Design and
operation of subsea production
systems - Part 4: Subsea
wellhead and tree equipment
INTERNATIONAL ISO
STANDARD 10423
Second edition
2001-08-01
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 10423:2001(E)
©
ISO 2001
ISO 10423:2001(E)
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ii © ISO 2001 – All rights reserved

ISO 10423:2001(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 (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 hangers .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-pressure 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,
bullplugs, 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
ISO 10423:2001(E)
7 Quality control.57
7.1 General.57
7.2 Measuring and testing equipment .57
7.3 QuaIity 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 .106
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 Lock screws, alignment pins and retainer screw packing mechanisms .202
10.18 Other end connectors (OECs) .203
10.19 Top connectors .204
10.20 Surface and underwater safety valves and actuators.205
10.21 Bullplugs.210
10.22 Valve-removal plugs.213
10.23 Other pressure-boundary penetrations.213
10.24 Back-pressure valves.214
11 Repair and remanufacture .214
iv © ISO 2001 – All rights reserved

ISO 10423:2001(E)
Annex A (informative) Purchasing guidelines.215
Annex B (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.340
Annex J (normative) Repair and remanufacture requirements.348
Annex K (informative) Recommended specifications for top connectors for christmas trees.361
Annex L (normative) Specifications for valve-removal preparations and valve-removal plugs.376
Annex M (informative) List of tables and figures .391
Bibliography.401
ISO 10423:2001(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 3.
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 International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 10423 was prepared by Technical Committee ISO/TC 67, Materials, equipment and
offshore structures for petroleum and natural gas industries, Subcommittee SC 4, Drilling and production
equipment.
This second edition cancels and replaces ISO 10419, ISO 10433 and the first edition of ISO 10423
(ISO 10423:1994).
Annexes H, I, J and L form a normative part of this International Standard. Annexes A, B, C, D, E, F, G, K and M
are for information only.
vi © ISO 2001 – All rights reserved

ISO 10423:2001(E)
Introduction
This International Standard is based on API Spec 6A, seventeenth edition, February 1996, its errata and
supplement, and API Spec 6AV1, first edition, February 1996.
The contents of API Spec 14D (upon which ISO 10433 was based) and API Recommended Practice 14H (upon
which ISO 10419 was based) have been incorporated in API Spec 6A, seventeenth edition.
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 which are marked with an asterisk are repeated
in annex B in US customary units with the same table number as in the main body but with the prefix B. See also
annex M for listings of tables and figures.
Users of this International Standard should be aware that further or differing requirements may 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 may be
particularly applicable where there is innovative or developing technology. Where an alternative is offered, the
vendor should identify any variations from this International Standard and provide details.
INTERNATIONAL STANDARD ISO 10423:2001(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 10423:2001(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;
� hubs;
� pressure boundary penetrations;
� ring gaskets;
� running and testing tools (in annex H);
� wear bushings (in annex H).
The nomenclature used in this International Standard for typical equipment is shown in Figure 1 and Figure 2. All
parts whose physical dimensions conform to the metric tables incorporated into the body of this International
Standard or to the US customary units tables 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 2001 – All rights reserved

ISO 10423:2001(E)
1.4 Product specification levels (PSL)
This International Standard establishes requirements for five product specification levels. 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 downhole 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
ISO 10423:2001(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 (continued)
4 © ISO 2001 – All rights reserved

ISO 10423:2001(E)
Key
1 Gauge valve 7 Tee
2 Bonnet nut 8 Wing valve
3 Blanking plug 9 Choke
4 Body 10 Master valve
5 Top connector 11 Tubing head adapter
6 Swab or crown valve
Figure 2 — Typical christmas tree nomenclature
ISO 10423:2001(E)
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
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 10414-1, Petroleum and natural gas industries � Field testing of drilling and completion fluids and well
cement� Part 1: Water-based fluids.
ISO 10422, Petroleum and natural gas industries� Threading, gauging, and thread inspection of casing, tubing
and line pipe threads� Specification.
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� Specification for 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 and line pipe.
1)
API Spec 7:1997, Specification for rotary drill stem elements.
API RP 14F, Recommended practice for design and installation of electrical systems for offshore fixed and floating
production facilities for unclassified and class 1, division 1 and division 2 locations.
2)
ASME B1.1, Unified inch screw threads.
ASME B1.2, Gages and gaging for unified inch screw threads.
ASME B1.20.1, Pipe threads, general purpose (inch).
ASME Boiler and Pressure Vessel Code:1998, Section V, Non destructive examination.
ASME Boiler and Pressure Vessel Code:1998, Section VIII, Division 1, Rules for construction of pressure vessels.
ASME Boiler and Pressure Vessel Code:1998, Section VIII, Division 2, Alternative rules for construction of pressure
vessels.
ASME Boiler and Pressure Vessel Code:1998, Section IX, Welding and brazing qualifications.
3)
ASNT SNT-TC-1A, Personnel qualifications and certification in non destructive testing.
1) American Petroleum Institute, 1220 L Street North West, Washington, D.C. 20005, USA.
th
2) ASME International, 345 East 47 Street New York, NY 10017-2392, USA.
3) American Society for Non destructive Testing, 4153 Arlingate Plaza, Columbus, OH 43228-0518, USA.
6 © ISO 2001 – All rights reserved

ISO 10423:2001(E)
4)
ASTM A 193/A 193 M, Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High-
Temperature Service.
ASTM A 194/A 194M, Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High-Pressure or High-
Temperature Service, or Both.
ASTM A 320/A 320M, Standard Specification for Alloy/Steel Bolting Materials for Low-Temperature Service.
ASTM A 370, Standard Test Methods and Definitions for Mechanical Testing of Steel Products.
ASTM A 388/A 388M, Standard Practice for Ultrasonic Examination of Heavy Steel Forgings.
ASTM A 453/A 453 M, Standard Specification for High-Temperature Bolting Materials, With Expansion Coefficients
Comparable to Austenitic Stainless Steels.
ASTM A 703/A 703M:1999, Standard Specification for Steel Castings, General Requirements, for Pressure-
Containing Parts.
ASTM D 395, Standard Test Methods for Rubber Property� Compression Set.
ASTM D 412, Standard Test Methods for Vulcanized Rubber and Thermoplastic Rubbers and Thermoplastic
Elastomers� Tension.
ASTM D 471, Standard Test Method for Rubber Property� Effect of Liquids.
ASTM D 1414, Standard Test Methods for Rubber O-Rings.
ASTM D 1415, Standard Test Method for Rubber Property — International Hardness.
ASTM D 1418, Standard Practice for Rubber and Rubber Latices — Nomenclature.
ASTM D 2240, Standard Test Method for Rubber Property — Durometer Hardness.
ASTM E 10, Standard Test Method for Brinell Hardness of Metallic Materials.
ASTM E 18, Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic
Materials.
ASTM E 92, Standard Test Method for Vickers Hardness of Metallic Materials.
ASTM E 94, Standard Guide for Radiographic Examination.
ASTM E 140, Standard Hardness Conversion Tables for Metals, (Relationship Among Brinell Hardness, Vickers
Hardness, Rockwell Hardness, Rockwell Superficial Hardness, Knoop Hardness and Scleroscope Hardness).
ASTM E 165, Standard Test Method for Liquid Penetrant Examination.
ASTM E 428, Standard Practice for Fabrication and Control of Steel Reference Blocks Used in Ultrasonic
Inspection.
ASTM E 709, Standard Guide for Magnetic Particle Examination.
ASTM E 747, Standard Practice for Design, Manufacture and Material Grouping Classification of Wire Image
Quality Indicators (IQI) Used for Radiology.
4) American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-11887, USA.
ISO 10423:2001(E)
5)
EN 473, 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)
NACE MR 0175:1999, Standard material requirements� Sulfide stress cracking resistant metallic materials for
oilfield equipment.
8)
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 International Standard, 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 which can be viewed, for purposes of non-destructive examination, by direct line of sight
NOTE This excludes test ports, control line ports, lockdown screw holes and other penetrations of these types.
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 packoff
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
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) NACE, P.O. Box 218340, Houston, TX 77218, USA.
8) SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, USA.
8 © ISO 2001 – All rights reserved

ISO 10423:2001(E)
3.1.8
body
any portion of wellhead and christmas tree equipment between end connections, with or without internal parts,
which contains well-bore pressure
3.1.9
bolting closure
threaded fastener used to assemble well-bore pressure-containing parts or join end or outlet connections
EXAMPLES Studs, nuts, bolts and capscrews.
3.1.10
exposed bolting
bolting that is exposed directly to the sour environment or that is buried, insulated, equipped with flange protectors,
or otherwise denied direct atmospheric exposure
3.1.11
non-exposed bolting
bolting that is not directly exposed to sour environments and is not intended to be buried, insulated, equipped with
flange protectors, or otherwise denied direct atmospheric exposure
3.1.12
bonnet
pressure-containing closure for a body, other than an end or outlet connection
3.1.13
bottom casing packoff
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
3.1.14
bullplug
pressure-containing closure for a female threaded end or outlet connection, which may have an internal counter
bore and/or test port
3.1.15
calibration
comparison and adjustment to a standard of known accuracy
3.1.16
carbon steel
alloy of carbon and iron containing a maximum of 2 % carbon (mass fraction), 1,65 % manganese (mass fraction),
and residual quantities of other elements, except those intentionally added in specific quantities for deoxidation
(usually silicon and/or aluminium)
3.1.17
casing
pipe run from the surface and intended to line the walls of a drilled hole
3.1.18
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
3.1.19
slip-type casing hanger
mechanism used to support a casing string in a casing head by gripping the pipe with wedge-type members
3.1.20
casing head housing
equipment attached to the uppermost end of the surface casing which serves to suspend and seal a casing string
ISO 10423:2001(E)
3.1.21
casing head spool
equipment attached to another casing head which serves to suspend and seal a secondary casing string
3.1.22
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.
3.1.23
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 flowrate
3.1.26
choke trim
pressure-controlling choke component, including choke beans, used to control or regulate the flow of fluids
NOTE One-piece stems, and that segment of multi-piece stems that passes through the pressure boundary, are pressure-
containing components.
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
3.1.28
conformance
compliance with specified requirements
3.1.29
loose connector
connector, as-manufactured, not intended to be made integral with another piece of wellhead and christmas tree
equipment
EXAMPLE There are blind, threaded, spacer, welding neck, flanged, studded, or other loose connectors.
3.1.30
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)
3.1.31
corrosion-resistant ring grooves
ring grooves lined with metal resistant to metal-loss corrosion
NOTE This metal is either a CRA or an austenitic stainless steel.
3.1.32
cross
pressure-containing fitting with a minimum of four openings
10 © ISO 2001 – All rights reserved

ISO 10423:2001(E)
3.1.33
cross-over connector
adapter with a restricted-area sealing means and with a top-connection pressure rating above that of the lower
connection
3.1.34
cross-over flange
double- or single-studded adapter flange with a restricted-area sealing means and with a top-connection pressure
rating above that of the lower connection
3.1.35
cross-over spool
flanged or other connected equipment with a restricted-
...