ISO 14723:2001

Petroleum and natural gas industries — Pipeline transportation systems — Subsea pipeline valves

La présente Norme Internationale spécifie des exigences minimales et donne des recommandations pour la conception, la fabrication, les essais et la documentation des vannes à tournant sphérique, clapets de retenue et robinets-vannes prévus pour des applications immergées dans les systèmes de conduites sous-marines satisfaisant aux exigences de l'ISO 13623 applicable aux Industries du Pétrole et du Gaz Naturel. Les vannes pour des classes de pression excédant PN 420 (classe 2500) ne sont pas couvertes par la présente Norme Internationale. L'Annexe A de la présente Norme Internationale présente des lignes directrices pour aider les acheteurs à sélectionner le type de vanne et à spécifier les exigences particulières lors d'une commande de vannes. L'Annexe B de la présente Norme Internationale présente une liste résumée des informations que le fabricant et/ou l'acheteur doivent fournir lors d'une commande de vannes.

Industries du pétrole et du gaz naturel — Systèmes de transport par conduites — Vannes de conduites immergées

General Information

• Status: Withdrawn
• Publication Date: 12-Dec-2001
• Withdrawal Date: 12-Dec-2001
• ICS: 75.200 - Petroleum products and natural gas handling equipment
• Technical Committee: ISO/TC 67/SC 2 - Pipeline transportation systems
• Drafting Committee: ISO/TC 67/SC 2 - Pipeline transportation systems
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 08-Jun-2009

Relations

• Revised: ISO 14723:2009 - Petroleum and natural gas industries — Pipeline transportation systems — Subsea pipeline valves
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 14723
First edition
2001-12-01


Petroleum and natural gas industries —
Pipeline transportation systems — Subsea
pipeline valves
Industries du pétrole et du gaz naturel — Systèmes de transport par
conduites — Vannes de conduites immergées




Reference number
ISO 14723:2001(E)
©
 ISO 2001

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ISO 14723:2001(E)
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©  ISO 2001
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ii © ISO 2001 – All rights reserved

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ISO 14723:2001(E)
Contents Page
Foreword.v
Introduction.vi
1 Scope .1
2 Normative references.1
3 Terms and definitions .3
4 Symbols and abbreviated terms .7
4.1 Symbols.7
4.2 Abbreviated terms .7
5 Valve types and configurations .8
5.1 Valve types .8
5.2 Valve configuration .9
6 Design.19
6.1 Design codes and calculations .19
6.2 Pressure and temperature ratings .20
6.3 Cavity relief .20
6.4 External pressure and loads .20
6.5 Sizes.20
6.6 Face-to-face and end-to-end dimensions .21
6.7 Minimum bore full-opening valves .30
6.8 Valve operation .30
6.9 Pigging.30
6.10 Valve ends .31
6.11 Bypass, drain and vent connections.31
6.12 Handwheels and wrenches.31
6.13 Locking devices.32
6.14 Position indicators .32
6.15 ROV interface .32
6.16 Sealant injection .32
6.17 Lifting lugs .32
6.18 Actuators/gearbox .32
6.19 Drive trains .33
6.20 Stem shaft protector.34
6.21 Hydraulic lock .34
6.22 Corrosion/erosion.34
6.23 Hyperbaric performance .34
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ISO 14723:2001(E)
6.24 Design document review .34
7 Material .34
7.1 Material specification .34
7.2 Service compatibility.35
7.3 Forged parts .35
7.4 Composition limits.35
7.5 Toughness test requirements .36
7.6 Bolting.37
7.7 Sour service .37
8 Welding .38
8.1 Qualifications .38
8.2 Impact testing.38
8.3 Hardness testing.38
9 Quality control.40
9.1 General.40
9.2 Measuring and test equipment.40
9.3 Qualification of inspection and test personnel .40
9.4 NDE .40
9.5 NDE of repair welding .41
10 Testing .41
10.1 General.41
10.2 Hydrostatic shell test .42
10.3 Operational/functional test .42
10.4 Hydrostatic seat test .43
10.5 Cavity relief test .45
10.6 Pneumatic seat test .45
11 Marking .45
12 Storing and shipping.49
12.1 Painting.49
12.2 Corrosion prevention .49
12.3 Protection .49
13 Documentation.49
Annex A (informative) Purchasing guidelines.51
Annex B (informative) Summary of information to be provided by manufacturer and/or purchaser .54
Annex C (normative) Supplementary test requirements.56
Annex D (normative) Supplementary documentation requirements .58
Annex E (normative) NDE requirements.59
Bibliography .62

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ISO 14723:2001(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.
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 International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 14723 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for
petroleum and natural gas industries, Subcommittee SC 2, Pipeline transportation systems.
Annexes C, D and E form a normative part of this International Standard. Annexes A and B are for information only.
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ISO 14723:2001(E)
Introduction
This International Standard is based on ISO 14313. It has been developed to address special requirements specific
to subsea pipeline valves.
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 contractor from offering, or the
company from accepting, alternative engineering solutions for the individual application. This may be particularly
applicable where there is innovative or developing technology. Where an alternative is offered, the manufacturer
should identify any variations from this International Standard and provide details.

vi © ISO 2001 – All rights reserved

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INTERNATIONAL STANDARD ISO 14723:2001(E)

Petroleum and natural gas industries — Pipeline transportation
systems — Subsea pipeline valves
1 Scope
This International Standard specifies requirements and gives recommendations for the design, manufacturing,
testing and documentation of ball, check and gate valves for subsea application in offshore pipeline systems
meeting the requirements of ISO 13623 for the petroleum and natural gas industries.
This International Standard is not applicable to valves for pressure ratings exceeding PN 420 (Class 2500).
Annex A of this International Standard provides guidelines to assist the purchaser with valve type selection and
specification of requirements when ordering valves.
Annex B of this International Standard provides a checklist summary of information to be provided by the
manufacturer and/or purchaser when ordering valves.
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 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances and
designation
ISO 148, Steel — Charpy impact test (V-notch)
ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions, tolerances
and designation
ISO 228-2, Pipe threads where pressure-tight joints are not made on the threads — Part 2: Verification by means
of limit gauges
ISO 5208, Industrial valves — Pressure testing of valves
ISO 7005-1, Metallic flanges — Part 1: Steel flanges
ISO 9712, Non-destructive testing — Qualification and certification of personnel
ISO 10474, Steel and steel products — Inspection documents
ISO 13623, Petroleum and natural gas industries — Pipeline transportation systems
1)
ASME B1.1, Unified inch screw threads (UN and UNR thread form)

1) American Society of Mechanical Engineers, 345 East 47th Street, NY 10017-2392, USA.
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ISO 14723:2001(E)
ASME B1.20.1, Pipe threads, general purpose (inch)
ASME B16.5, Pipe flanges and flanged fittings — NPS 1/2 through NPS 24
ASME B16.10, Face-to-face and end-to-end dimensions of valves
ASME B16.25, Buttwelding ends
ASME B16.34, Valves — Flanged, threaded, and welding end
ASME B16.47, Large diameter steel flanges — NPS 26 through NPS 60
ASME B31.4, Pipeline transportation systems for liquid hydrocarbons and other liquids
ASME B31.8, Gas transmission and distribution systems
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, Section IX, Qualification standard for welding and brazing procedures,
welders, brazers, and welding and brazing operators
2)
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 435/A 435M, Standard specification for straight-beam ultrasonic examination of steel plates
ASTM A 577/A 577M, Standard specification for ultrasonic angle-beam examination of steel plates
ASTM A 578/A 578M, Standard specification for straight-beam ultrasonic examination of plain and clad steel plates
for special applications
ASTM A 609/A 609M:1997, Standard practice for castings, carbon low-alloy, and martensitic stainless steel,
ultrasonic examination thereof
3)
AWS QC1, Standard for AWS certification of welding inspectors
EN 287-1, Approval testing of welders — Fusion welding — Part 1: Steels
EN 288-3, Specification and approval of welding procedures for metallic materials  Part 3: Welding procedure
tests for the arc welding of steels
4)
MSS SP-44, Steel pipeline flanges
MSS SP-55, Quality standard for steel castings, flanges, fittings and other piping components — Visual method for
evaluation of surface irregularities
5)
NACE MR 0175, Sulfide stress cracking resistant metallic materials for oilfield equipment
NACE TM 0284, Evaluation of pipeline and pressure vessel steels for resistance to hydrogen-induced cracking

2) American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, USA.
3) The American Welding Society, 550 NW LeJeune Road, Miami, FL 33126, USA.
4) Manufacturers Standardization Society of the Valve & Fittings Industry Inc., 127 Park Street N.E., Vienna, VA 22180, USA.
5) National Association of Corrosion Engineers, P.O. Box 218340, Houston, TX 77218, USA.
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ISO 14723:2001(E)
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1
ANSI rating class
numerical pressure design class defined in ASME B16.5 and used for reference purposes
NOTE The ANSI rating class is designated by the word “Class” followed by a number.
[ISO 14313:1999]
3.2
bi-directional valve
valve designed for blocking the fluid in both downstream and upstream directions
[ISO 14313:1999]
3.3
bleed
drain or vent
[ISO 14313:1999]
3.4
block valve
ball or gate valve that blocks flow into the downstream conduit when in the closed position
NOTE 1 Valves are either single- or double-seated, bi-directional or uni-directional.
NOTE 2 Adapted from ISO 14313:1999.
3.5
breakaway thrust [torque]
thrust [torque] required for opening a valve with maximum pressure differential
NOTE Adapted from ISO 14313:1999.
3.6
by agreement
agreed between manufacturer and purchaser
[ISO 14313:1999]
3.7
double-block-and-bleed valve
valve with two seating surfaces which, in the closed position, blocks flow from both valve ends when the cavity
between the seating surfaces is vented through a bleed connection provided on the body cavity
[ISO 14313:1999]
3.8
drive train
all parts of a valve drive between the operator and the obturator, including the obturator but excluding the operator
[ISO 14313:1999]
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ISO 14723:2001(E)
3.9
flow coefficient
q
v
volumetric flowrate of water at a temperature between 5 °C (40 °F) and 40 °C (104 °F) passing through a valve and
resulting in a pressure loss of 100 kPa (14,7 psi)
NOTE 1 It is expressed in cubic metres per hour.
NOTE 2 q relates to the flowrate coefficient C in US gallons per minute at 15,6 °C (60 °F) resulting in 1 psi pressure drop as

v v
follows:
C
v
q =
v
1,156
NOTE 3 Adapted from ISO 14313:1999.
3.10
full-opening valve
valve with an unobstructed opening capable of allowing a sphere or other internal device for the same nominal size
as the valve to pass
[ISO 14313:1999]
3.11
handwheel
wheel consisting of a rim connected to a hub, for example by spokes, and used to operate manually a valve
requiring multiple turns
[ISO 14313:1999]
3.12
locking device
part or an arrangement of parts for securing a valve in the open and/or closed position
[ISO 14313:1999]
3.13
manual operator
wrench (lever) or handwheel with or without a gearbox
[ISO 14313:1999]
3.14
maximum pressure differential
MPD
maximum difference between the upstream and downstream pressures across the obturator at which the obturator
may be operated
NOTE Adapted from ISO 14313:1999.
3.15
nominal pipe size
NPS
numerical inches designation of size which is common to components in piping systems of any one size
NOTE The nominal pipe size is designated by the letters NPS followed by a number
[ISO 14313:1999]
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ISO 14723:2001(E)
3.16
nominal pressure class
PN class
numerical pressure design class as defined in ISO 7005-1 and used for reference purposes
NOTE The nominal pressure class is designated by the letters PN followed by a number.
[ISO 14313:1999]
3.17
nominal size
DN
numerical metric designation of size which is common to components in piping systems of any one size
NOTE  Nominal size is designated by the letters DN followed by a number.
[ISO 14313:1999]
3.18
obturator
closure member
part of a valve which is positioned in the flow stream to permit or block flow
EXAMPLE Ball, clapper, disc, gate or plug.
NOTE Adapted from ISO 14313:1999.
3.19
operator
device (or assembly) for opening or closing a valve
[ISO 14313:1999]
3.20
pipe pup
short piece of pipe with length typically equivalent to one or two times its diameter, welded directly to the valve to
prevent valve seal damage from girth welding, for transition of valve material to pipeline strength properties, or to
provide a valve end mating the pipeline dimensions
3.21
position indicator
device to show the position of the valve obturator
[ISO 14313:1999]
3.22
powered operator
powered actuator
electric, hydraulic or pneumatic device bolted or otherwise attached to the valve for powered opening and closing
of the valve
[ISO 14313:1999]
3.23
pressure cap
cap designed to contain internal pressure in the event of seal leakage or to prevent ingress due to hyperbaric
pressure
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ISO 14723:2001(E)
3.24
pressure class
numerical pressure design class expressed in accordance with either the nominal pressure class or the ANSI rating
class
NOTE 1 In this International Standard the pressure class is stated by the PN class, followed by the ANSI rating class between
parentheses.
NOTE 2 Adapted from ISO 14313:1999.
3.25
pressure-containing part
part designed to contain the pipeline fluid
EXAMPLES Bodies, bonnets, glands, stems, gaskets and bolting.
NOTE Adapted from ISO 14313:1999.
3.26
pressure-controlling part
part intended to block or permit the flow of fluids
EXAMPLE Seat and obturator.
NOTE Adapted from ISO 14313:1999.
3.27
process-wetted part
part exposed directly to the pipeline fluid
NOTE Adapted from ISO 14313:1999.
3.28
protection cap
cover to protect valve parts from mechanical damage
NOTE  A pressure cap may also be used for protection.
3.29
reduced-opening valve
valve with the opening through the obturator smaller than at the end connection(s)
[ISO 14313:1999]
3.30
remote-operated vehicle
ROV
underwater vehicle operated remotely from a surface vessel or installation
3.31
seating surface
contact surface of the obturator and seat which ensure valve sealing
NOTE Adapted from ISO 14313:1999.
3.32
shaft
part of a check valve that connects the obturator to the operator and which may consist of one or more components
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ISO 14723:2001(E)
3.33
stem
part that connects the obturator to the operator and which may consist of one or more components
[ISO 14313:1999]
3.34
support ribs
legs
metal structure which provides a stable footing when the valve is set on a fixed base
NOTE Adapted from ISO 14313:1999.
3.35
through-conduit valve
valve with an unobstructed and continuous cylindrical opening
[ISO 14313:1999]
3.36
twin-seat valve
〈both seats bi-directional〉 valve with two seats, each sealing in either direction
NOTE Adapted from ISO 14313:1999.
3.37
twin-seat valve
〈one seat uni-directional and one seat bi-directional〉 valve with two seats, one sealing in one direction and the
other in either direction
NOTE Adapted from ISO 14313:1999.
3.38
uni-directional valve
valve designed for blocking the flow in one direction only
[ISO 14313:1999]
4 Symbols and abbreviated terms
4.1 Symbols
C Flow coefficient in United States Customary (USC) units
v
q Flow coefficient in SI units
v
4.2 Abbreviated terms
BM Base metal
CE Carbon equivalent
DN Nominal size
HAZ Heat-affected zone
HBW Brinell hardness
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ISO 14723:2001(E)
HIC Hydrogen-induced cracking
HRC Rockwell hardness
HV Vickers hardness
MPD Maximum pressure differential
MT Magnetic-particle testing
NDE Non-destructive examination
NPS Nominal pipe size
PN Nominal pressure
PQR Procedure qualification record
PT Penetrant testing
PWHT Post-weld heat treatment
ROV Remote-operated vehicle
RT Radiographic testing
SMYS Specified minimum yield strength
SSIV Subsea isolation valve
UT Ultrasonic testing
VT Visual testing
WM Weld metal
WPS Welding procedure specification
WQR Welder qualification record
5 Valve types and configurations
5.1 Valve types
5.1.1 Gate valves
Typical configurations for gate valves with flanged and welding ends are shown in
...