EN ISO 13628-4:2010

Petroleum and natural gas industries - Design and operation of subsea production systems - Part 4: Subsea wellhead and tree equipment (ISO 13628-4:2010)

ISO 13628-4:2010 provides specifications for subsea wellheads, mudline wellheads, drill-through mudline wellheads and both vertical and horizontal subsea trees. It specifies the associated tooling necessary to handle, test and install the equipment. It also specifies the areas of design, material, welding, quality control (including factory acceptance testing), marking, storing and shipping for both individual sub-assemblies (used to build complete subsea tree assemblies) and complete subsea tree assemblies.
The user is responsible for ensuring subsea equipment meets any additional requirements of governmental regulations for the country in which it is installed. This is outside the scope of ISO 13628-4:2010.
Where applicable, ISO 13628-4:2010 can also be used for equipment on satellite, cluster arrangements and multiple well template applications.
Equipment that is within the scope of ISO 13628-4:2010 is listed as follows:
subsea trees:
tree connectors and tubing hangers,
valves, valve blocks, and valve actuators,
chokes and choke actuators,
bleed, test and isolation valves,
TFL wye spool,
re-entry interface,
tree cap,
tree piping,
tree guide frames,
tree running tools,
tree cap running tools,
tree mounted flowline/umbilical connector,
tubing heads and tubing head connectors,
flowline bases and running/retrieval tools,
tree mounted controls interfaces (instrumentation, sensors, hydraulic tubing/piping and fittings, electrical controls cable and fittings);
subsea wellheads:
conductor housings,
wellhead housings,
casing hangers,
seal assemblies,
guidebases,
bore protectors and wear bushings,
corrosion caps;
mudline suspension systems:
wellheads,
running tools,
casing hangers,
casing hanger running tool,
tieback tools for subsea completion,
subsea completion adaptors for mudline wellheads,
tubing heads,
corrosion caps;
drill through mudline suspension systems:
conductor housings,
surface casing hangers,
wellhead housings,
casing hangers,
annulus seal assemblies,
bore protectors and wear bushings,
abandonment caps;
tubing hanger systems:
tubing hangers,
running tools;
miscellaneous equipment:
flanged end and outlet connections,
clamp hub-type connections,
threaded end and outlet connections,
other end connections,
studs and nuts,
ring joint gaskets,
guideline establishment equipment.
ISO 13628-4:2010 includes equipment definitions, an explanation of equipment use and function, an explanation of service conditions and product specification levels, and a description of critical components, i.e. those parts having requirements specified in ISO 13628-4:2010.
The following equipment is outside the scope of ISO 13628-4:2010:
subsea wireline/coiled tubing BOPs;
installation, workover, and production risers;
subsea test trees (landing strings);
control systems and control pods;
platform tiebacks;
primary protective structures;
subsea process equipment;
subsea manifolding and jumpers;
subsea wellhead tools;
repair and rework;
multiple well template structures;
mudline suspension high pressure risers;
template piping;
template interfaces.
ISO 13628-4:2010 is not applicable to the rework and repair of used equipment.

Erdöl- und Erdgasindustrie - Auslegung und Betrieb von Unterwasser-Produktionssystemen - Teil 4: Bohrloch- und E-Kreuz-Ausrüstungen für den Unterwassereinsatz (ISO 13628-4:2010)

Industries du pétrole et du gaz naturel - Conception et fonctionnement des systèmes de production immergés - Partie 4: Équipements immergés de tête de puits et tête de production (ISO 13628-4:2010)

L'ISO 13628-4:2010 fournit des spécifications relatives aux têtes de puits immergées, aux têtes de puits de conduite de boue, aux têtes de puits de conduite de boue pour forage traversant, ainsi qu'aux têtes de production immergées horizontales et verticales. Elle spécifie l'outillage associé nécessaire pour traiter, soumettre à l'essai et installer l'équipement. Elle spécifie également les domaines relatifs à la conception, aux matériaux, au soudage, au contrôle qualité (y compris les essais de réception en usine), au marquage, au stockage et à l'expédition des sous-ensembles individuels (utilisés pour construire les ensembles de têtes de production immergées complets) et des ensembles de têtes de production immergées complets.
L'utilisateur est chargé de s'assurer que l'équipement immergé satisfait à toute exigence supplémentaire de réglementations gouvernementales du pays dans lequel il est installé. Ce point ne relève pas du domaine d'application de l'ISO 13628-4:2010.
Le cas échéant, l'ISO 13628-4:2010 peut également être utilisée pour les équipements sur satellite, les dispositions groupées et les applications de châssis d'ancrage multipuits.
Les équipements qui font partie du domaine d'application de l'ISO 13628-4:2010 sont les suivants:
têtes de production immergées:
connecteurs de têtes de production et olives de suspension de colonne de production;
vannes, blocs de vannes et commandes de vanne;
duses et commandes de duse;
vannes de purge, d'essai et d'isolement;
montage en étoile TFL;
interface de rentrée;
chapeau de tête de production;
tuyauterie de tête de production;
bras de guidage de tête de production;
outils de pose de tête de production;
outils de pose du chapeau de tête de production;
connecteur de conduite d'écoulement ou d'ombilical monté sur la tête de production;
têtes de colonne de production et connecteurs de tête de colonne de production;
bases de conduite d'écoulement et outils de pose ou de récupération;
interfaces de commande montées sur la tête de production (instruments, capteurs, tubes, tuyauteries et raccords hydrauliques, câbles et raccords des commandes électriques);
têtes de puits immergées:
enveloppes du conducteur;
enveloppes de tête de puits;
coins de suspension de tubage;
garnitures d'étanchéité;
plaques de base;
protecteurs d'alésage et chemises d'usure amovibles;
chapeaux anticorrosion;
systèmes de suspension de conduite de boue:
têtes de puits;
outils de pose;
coins de suspension de tubage;
outil de pose des coins de suspension de tubage;
outils de raccordement pour complétion immergée;
adaptateurs de complétion immergée pour têtes de puits de conduite de boue;
têtes de colonne de production;
chapeaux anticorrosion;
systèmes de suspension de conduite de boue pour forage traversant:
enveloppes du conducteur;
coins de suspension de tubage de surface;
enveloppes de tête de puits;
coins de suspension de tubage;
garnitures d'étanchéités d'annulaire;
protecteurs d'alésage et chemises d'usure amovibles;
chapeaux d'abandon;
systèmes d'olives de suspension de colonne de production:
olives de suspension de colonne de production;
outils de pose;
équipements divers:
connexions d'extrémité et de sortie à brides;
raccords de type moyeu à pince;
connexions d'extrémité et de sortie filetés;
autres raccords d'extrémité;
boulons et écrous;
joints circulaires;
équipement d'établissement de câble de guidage.
L'ISO 13628-4:2010 comprend les définitions des équipements, une explication sur l'u

Industrija za predelavo nafte in zemeljskega plina - Načrtovanje in delovanje podvodnih proizvodnih sistemov - 4. del: Podvodna oprema za glavo izvrtine in križ na ustjih vrtin (ISO 13628-4:2010)

Ta del ISO 13628 zagotavlja specifikacije za podvodne glave izvrtin, glave izvrtin za linijo blata, glave izvrtin za vrtanje skozi linijo blata in za navpične ter vodoravne podvodne križe na ustjih vrtin. Določa povezana orodja, potrebna za ravnanje z opremo, preskušanje in vgrajevanje opreme. Prav tako določa področja načrtovanja, materialov, ravnanja, nadzora kakovosti (vključno s tovarniškim preskušanjem skladnosti), označevanja, hranjenja in pošiljanja za posamezne podsklope (uporabljene za gradnjo celotne podvodne sestave križev na ustju vrtin) in celotne podvodne sestave križev na ustjih vrtin. Uporabnik je odgovoren za zagotavljanje, da podvodna oprema izpolnjuje vse dodatne zahteve vladnih predpisov za državo, v kateri je postavljena. To je zunaj obsega tega dela ISO 13628. Kjer je primerno, se lahko ta del ISO 13628 uporabi tudi za opremo pri satelitih, skupinskih razporeditvah in predlogah aplikacij z več vrtinami.

General Information

• Status: Published
• Publication Date: 14-Dec-2010
• Withdrawal Date: 29-Jun-2011
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• Technical Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Drafting Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 15-Dec-2010
• Completion Date: 15-Dec-2010
• Ref Project: SIST EN ISO 13628-4:2011 - Petroleum and natural gas industries - Design and operation of subsea production systems - Part 4: Subsea wellhead and tree equipment (ISO 13628-4:2010)

Relations

• Replaces: EN ISO 13628-4:1999 - Petroleum and natural gas industries - Design and operation of subsea production systems - Part 4: Subsea wellhead and tree equipment (ISO 13628-4:1999)
• Effective Date: 22-Dec-2008
• Corrected By: EN ISO 13628-4:2010/AC:2011 - Petroleum and natural gas industries - Design and operation of subsea production systems - Part 4: Subsea wellhead and tree equipment - Technical Corrigendum 1 (ISO 13628-4:2010/Cor 1:2011)
• Effective Date: 07-May-2011

Overview

EN ISO 13628-4:2010 (ISO 13628-4:2010) defines requirements for the design, manufacture, testing and handling of subsea wellhead and subsea tree equipment used in petroleum and natural gas subsea production systems. The standard covers vertical and horizontal subsea trees, mudline wellheads and drill-through mudline wellheads, plus the associated tooling required to handle, install and test these assemblies. It also defines critical components and product specification levels, and gives requirements for materials, welding, quality control (including factory acceptance testing), marking, storing and shipping.

Note: compliance with country-specific governmental regulations is the user’s responsibility and outside this standard’s scope.

Key topics and technical requirements

• Equipment scope: subsea trees (tree connectors, tubing hangers, valves, chokes, valve actuators, tree caps, running tools, tree-mounted connectors, instrumentation interfaces), subsea wellheads (conductor and wellhead housings, casing hangers, seal assemblies, guidebases, corrosion caps), mudline and drill-through mudline suspension systems, tubing hanger systems, and related flanges/fasteners/guides.
• Design & performance: system-level design requirements for subsea tree assemblies, tubing hangers and wellheads; functional definitions and service-condition classifications.
• Materials & welding: material selection criteria and welding requirements for components exposed to subsea service.
• Quality control & testing: factory acceptance testing (FAT), manufacturing quality control, inspection and documentation for both sub-assemblies and complete tree assemblies.
• Tooling & running equipment: specifications for running/retrieval tools, tree running tools, tree cap running tools and ancillary installation tooling.
• Handling & logistics: marking, storage, transportation and protection requirements to preserve integrity prior to installation.
• Critical components: identification and special requirements for parts that directly affect performance and safety.

Practical applications

• Design validation and specification writing for subsea wellheads, trees and associated tooling.
• Procurement and manufacturing acceptance criteria for vendors supplying subsea equipment.
• Engineering and integrity teams performing FAT, inspection planning and shop acceptance.
• Installation contractors and offshore operations teams using standardized running tools and interfaces.
• Project managers and asset owners ensuring consistent product specification levels across satellite, cluster and multiple-well template applications.

Who uses this standard

• Oil & gas operators, subsea equipment manufacturers, engineering consultancies, inspection and testing houses, procurement teams and installation contractors involved in subsea production systems.

Related standards / exclusions

• Apply together with other parts of the ISO 13628 series for broader subsea production system guidance. EN ISO 13628-4:2010 excludes control systems, risers, subsea manifolds/jumpers, test trees, rework/repair of used equipment and certain template/pipework items - verify scope before application.

Keywords: EN ISO 13628-4:2010, ISO 13628-4, subsea wellhead, subsea tree equipment, mudline wellheads, tubing hanger, factory acceptance testing, subsea production systems.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2011
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SIST EN ISO 13628-4:2000
,QGXVWULMD]DSUHGHODYRQDIWHLQ]HPHOMVNHJDSOLQD1DþUWRYDQMHLQGHORYDQMH
SRGYRGQLKSURL]YRGQLKVLVWHPRYGHO3RGYRGQDRSUHPD]DJODYRL]YUWLQHLQ
NULåQDXVWMLKYUWLQ,62
Petroleum and natural gas industries - Design and operation of subsea production
systems - Part 4: Subsea wellhead and tree equipment (ISO 13628-4:2010)
Erdöl- und Erdgasindustrie - Auslegung und Betrieb von Unterwasser-
Produktionssystemen - Teil 4: Bohrloch- und E-Kreuz-Ausrüstungen für den
Unterwassereinsatz (ISO 13628-4:2010)
Industries du pétrole et du gaz naturel - Conception et fonctionnement des systèmes de
production immergés - Partie 4: Equipements immergés de tête de puits et tête de
production (ISO 13628-4:2010)
Ta slovenski standard je istoveten z: EN ISO 13628-4:2010
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 13628-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2010
ICS 75.180.10 Supersedes EN ISO 13628-4:1999
English Version
Petroleum and natural gas industries - Design and operation of
subsea production systems - Part 4: Subsea wellhead and tree
equipment (ISO 13628-4:2010)
Industries du pétrole et du gaz naturel - Conception et Erdöl- und Erdgasindustrie - Auslegung und Betrieb von
fonctionnement des systèmes de production immergés - Unterwasser-Produktionssystemen - Teil 4: Bohrloch- und
Partie 4: Équipements immergés de tête de puits et tête de E-Kreuz-Ausrüstungen für den Unterwassereinsatz (ISO
production (ISO 13628-4:2010) 13628-4:2010)
This European Standard was approved by CEN on 14 December 2010.

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-CENELEC 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-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13628-4:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 13628-4:2010) 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 2011, and conflicting national standards shall be withdrawn at
the latest by June 2011.
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 13628-4:1999.
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, Croatia, 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 13628-4:2010 has been approved by CEN as a EN ISO 13628-4:2010 without any
modification.
INTERNATIONAL ISO
STANDARD 13628-4
Second edition
2010-12-15
Petroleum and natural gas industries —
Design and operation of subsea
production systems
Part 4:
Subsea wellhead and tree equipment
Industries du pétrole et du gaz naturel — Conception et exploitation des
systèmes de production immergés
Partie 4: Équipements immergés de tête de puits et tête de production

Reference number
ISO 13628-4:2010(E)
©
ISO 2010
ISO 13628-4:2010(E)
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ii © ISO 2010 – All rights reserved

ISO 13628-4:2010(E)
Contents Page
Foreword .v
Introduction.vi
1 Scope.1
2 Normative references.4
3 Terms, definitions, abbreviated terms and symbols .5
3.1 Terms and definitions .5
3.2 Abbreviated terms and symbols.10
4 Service conditions and production specification levels.12
4.1 Service conditions.12
4.2 Product specification levels.13
5 Common system requirements.13
5.1 Design and performance requirements .13
5.2 Materials .25
5.3 Welding.26
5.4 Quality control .27
5.5 Equipment marking.30
5.6 Storing and shipping.31
6 General design requirements for subsea trees and tubing hangers .32
6.1 General .32
6.2 Tree valving.34
6.3 Testing of subsea tree assemblies.42
6.4 Marking.47
6.5 Storing and shipping.47
7 Specific requirements — Subsea-tree-related equipment and sub assemblies.47
7.1 Flanged end and outlet connections.47
7.2 ISO clamp hub-type connections .65
7.3 Threaded connections .65
7.4 Other end connectors .65
7.5 Studs, nuts and bolting.66
7.6 Ring gaskets .66
7.7 Completion guidebase.67
7.8 Tree connectors and tubing heads.68
7.9 Tree stab/seal subs for vertical tree.72
7.10 Valves, valve blocks and actuators.73
7.11 TFL wye spool and diverter.86
7.12 Re-entry interface.87
7.13 Subsea tree cap.88
7.14 Tree-cap running tool.91
7.15 Tree-guide frame .93
7.16 Tree running tool.97
7.17 Tree piping .100
7.18 Flowline connector systems .102
7.19 Ancillary equipment running tools.105
7.20 Tree-mounted hydraulic/electric/optical control interfaces.107
7.21 Subsea chokes and actuators.110
7.22 Miscellaneous equipment.121
8 Specific requirements — Subsea wellhead .125
8.1 General .125
ISO 13628-4:2010(E)
8.2 Temporary guidebase . 126
8.3 Permanent guidebase . 127
8.4 Conductor housing. 131
8.5 Wellhead housing . 134
8.6 Casing hangers. 137
8.7 Annulus seal assemblies . 140
8.8 Casing hanger lockdown bushing . 141
8.9 Bore protectors and wear bushings . 142
8.10 Corrosion cap. 144
8.11 Running, retrieving and testing tools. 144
8.12 Trawl protective structure. 144
8.13 Wellhead inclination and orientation. 144
8.14 Submudline casing hanger and seal assemblies. 145
9 Specific requirements — Subsea tubing hanger system . 146
9.1 General. 146
9.2 Design . 146
9.3 Materials . 149
9.4 Testing . 149
10 Specific requirements — Mudline suspension equipment . 150
10.1 General. 150
10.2 Mudline suspension-landing/elevation ring. 154
10.3 Casing hangers. 155
10.4 Casing hanger running tools and tieback adapters. 156
10.5 Abandonment caps. 157
10.6 Mudline conversion equipment for subsea completions . 157
10.7 Tubing hanger system — Mudline conversion equipment for subsea completions. 158
11 Specific requirements — Drill-through mudline suspension equipment . 159
11.1 General. 159
11.2 External drill-through casing hangers (outside of the hybrid casing hanger housing). 159
11.3 Hybrid casing hanger housing. 159
11.4 Internal drill-through mudline casing hangers. 161
11.5 Annulus seal assemblies . 163
11.6 Bore protectors and wear bushings . 164
11.7 Tubing hanger system — Drill-through mudline equipment for subsea completions. 166
11.8 Abandonment caps. 166
11.9 Running, retrieving and testing tools. 166
Annex A (informative) Vertical subsea trees . 167
Annex B (informative) Horizontal subsea trees . 171
Annex C (informative) Subsea wellhead . 174
Annex D (informative) Subsea tubing hanger . 176
Annex E (normative) Mudline suspension and conversion systems . 180
Annex F (informative) Drill-through mudline suspension systems . 187
Annex G (informative) Assembly guidelines of ISO (API) bolted flanged connections. 189
Annex H (informative) Design and testing of subsea wellhead running, retrieving and testing tools. 199
Annex I (informative) Procedure for the application of a coating system. 202
Annex J (informative) Screening tests for material compatibility. 205
Annex K (informative) Design and testing of pad eyes for lifting . 210
Annex L (informative) Hyperbaric testing guidelines. 225
Annex M (informative) Purchasing guidelines . 227
Bibliography. 249

iv © ISO 2010 – All rights reserved

ISO 13628-4:2010(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 13628-4 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 second edition cancels and replaces the first edition (ISO 13628-4:1999), which has been technically
revised.
ISO 13628 consists of the following parts, under the general title Petroleum and natural gas industries —
Design and operation of subsea production systems:
⎯ Part 1: General requirements and recommendations
⎯ Part 2: Unbonded flexible pipe systems for subsea and marine applications
⎯ Part 3: Through flowline (TFL) systems
⎯ Part 4: Subsea wellhead and tree equipment
⎯ Part 5: Subsea umbilicals
⎯ Part 6: Subsea production control systems
⎯ Part 7: Completion/workover riser systems
⎯ Part 8: Remotely Operated Vehicle (ROV) interfaces on subsea production systems
⎯ Part 9: Remotely Operated Tool (ROT) intervention systems
⎯ Part 10: Specification for bonded flexible pipe
⎯ Part 11: Flexible pipe systems for subsea and marine applications
A part 12, dealing with dynamic production risers, a part 14, dealing with High Integrity Pressure Protections
Systems (HIPPS), a part 15, dealing with subsea structures and manifolds, a part 16, dealing with
specifications for flexible pipe ancillary equipment, and a part 17, dealing with recommended practice for
flexible pipe ancillary equipment, are under development.
ISO 13628-4:2010(E)
Introduction
This second edition of ISO 13628-4 has been updated by users and manufacturers of subsea wellheads and
trees. Particular attention was paid to making it an auditable standard. It is intended for worldwide application
in the petroleum industry. It is not intended to replace sound engineering judgement. It is necessary that users
of this part of ISO 13628 be aware that additional or different requirements can better suit the demands of a
particular service environment, the regulations of a jurisdictional authority or other scenarios not specifically
addressed.
A major effort in developing this second edition was a study of the risks and benefits of penetrations in subsea
wellheads. All previous editions of both this part of ISO 13628 and its parallel API document Specification for
Subsea Wellhead and Christmas Tree Equipment (Specification 17D) prohibited wellhead penetrations.
However, that prohibition was axiomatic. In developing this second edition, the workgroup used qualitative risk
analysis techniques and found that the original insight was correct: subsea wellheads with penetrations are
more than twice as likely to develop leaks over their life as those without penetrations.
The catalyst for examining this portion of the original editions of the API and ISO standards was the
phenomenon of casing pressure and its monitoring in subsea wells. The report generated by the
aforementioned risk analysis has become API 17 TR3 and API RP 90. The workgroup encourages the use of
these documents when developing designs and operating practices for subsea wells.
Care has also been taken to address the evolving issue of using external hydrostatic pressure in design. The
original versions of both API 17D and ISO 13628-4 were adopted at a time when the effects of that parameter
were relatively small. The industry’s move into greater water depths has prompted a consideration of that
aspect in this version of this part of ISO 13628. The high-level view is that it is not appropriate to use external
hydrostatic pressure to augment the applications for which a component can be used. For example, this part
of ISO 13628 does not allow the use of a subsea tree rated for 69 MPa (10 000 psi) installed in 2 438 m
(8 000 ft) of water on a well that has a shut-in tubing pressure greater than 69 MPa (10 000 psi). See 5.1.2.1.1
for further guidance.
The design considerations involved in using external hydrostatic pressure are only currently becoming fully
understood. If a user or fabricator desires to explore these possibilities, it is recommended that a thorough
review of the forthcoming American Petroleum Institute technical bulletin on the topic be carefully studied.
The overall objective of this part of ISO 13628 is to define clear and unambiguous requirements that facilitate
international standardization in order to enable safe and economic development of offshore oil and gas fields
by the use of subsea wellhead and tree equipment. It is written in a manner that allows the use of a wide
variety of technology, from well established to state-of-the-art. The contributors to this update do not wish to
restrict or deter the development of new technology. However, the user of this part of ISO 13628 is
encouraged to closely examine standard interfaces and the reuse of intervention systems and tools in the
interests of minimizing life-cycle costs and increasing reliability through the use of proven interfaces.
It is important that users of this part of ISO 13628 be aware that further or differing requirements can be
needed for individual applications. This part of ISO 13628 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 part of ISO 13628 and provide
details.
vi © ISO 2010 – All rights reserved

INTERNATIONAL STANDARD ISO 13628-4:2010(E)

Petroleum and natural gas industries — Design and operation
of subsea production systems
Part 4:
Subsea wellhead and tree equipment
1 Scope
This part of ISO 13628 provides specifications for subsea wellheads, mudline wellheads, drill-through mudline
wellheads and both vertical and horizontal subsea trees. It specifies the associated tooling necessary to
handle, test and install the equipment. It also specifies the areas of design, material, welding, quality control
(including factory acceptance testing), marking, storing and shipping for both individual sub-assemblies (used
to build complete subsea tree assemblies) and complete subsea tree assemblies.
The user is responsible for ensuring subsea equipment meets any additional requirements of governmental
regulations for the country in which it is installed. This is outside the scope of this part of ISO 13628.
Where applicable, this part of ISO 13628 can also be used for equipment on satellite, cluster arrangements
and multiple well template applications.
Equipment that is within the scope of this part of ISO 13628 is listed as follows:
a) subsea trees:
⎯ tree connectors and tubing hangers,
⎯ valves, valve blocks, and valve actuators,
⎯ chokes and choke actuators,
⎯ bleed, test and isolation valves,
⎯ TFL wye spool,
⎯ re-entry interface,
⎯ tree cap,
⎯ tree piping,
⎯ tree guide frames,
⎯ tree running tools,
⎯ tree cap running tools,
⎯ tree mounted flowline/umbilical connector,
⎯ tubing heads and tubing head connectors,
ISO 13628-4:2010(E)
⎯ flowline bases and running/retrieval tools,
⎯ tree mounted controls interfaces (instrumentation, sensors, hydraulic tubing/piping and fittings,
electrical controls cable and fittings);
b) subsea wellheads:
⎯ conductor housings,
⎯ wellhead housings,
⎯ casing hangers,
⎯ seal assemblies,
⎯ guidebases,
⎯ bore protectors and wear bushings,
⎯ corrosion caps;
c) mudline suspension systems:
⎯ wellheads,
⎯ running tools,
⎯ casing hangers,
⎯ casing hanger running tool,
⎯ tieback tools for subsea completion,
⎯ subsea completion adaptors for mudline wellheads,
⎯ tubing heads,
⎯ corrosion caps;
d) drill through mudline suspension systems:
⎯ conductor housings,
⎯ surface casing hangers,
⎯ wellhead housings,
⎯ casing hangers,
⎯ annulus seal assemblies,
⎯ bore protectors and wear bushings,
⎯ abandonment caps;
2 © ISO 2010 – All rights reserved

ISO 13628-4:2010(E)
e) tubing hanger systems:
⎯ tubing hangers,
⎯ running tools;
f) miscellaneous equipment:
⎯ flanged end and outlet connections,
⎯ clamp hub-type connections,
⎯ threaded end and outlet connections,
⎯ other end connections,
⎯ studs and nuts,
⎯ ring joint gaskets,
⎯ guideline establishment equipment.
This part of ISO 13628 includes equipment definitions, an explanation of equipment use and function, an
explanation of service conditions and product specification levels, and a description of critical components, i.e.
those parts having requirements specified in this part of ISO 13628.
The following equipment is outside the scope of this part of ISO 13628:
⎯ subsea wireline/coiled tubing BOPs;
⎯ installation, workover, and production risers;
⎯ subsea test trees (landing strings);
⎯ control systems and control pods;
⎯ platform tiebacks;
⎯ primary protective structures;
⎯ subsea process equipment;
⎯ subsea manifolding and jumpers;
⎯ subsea wellhead tools;
⎯ repair and rework;
⎯ multiple well template structures;
⎯ mudline suspension high pressure risers;
⎯ template piping;
⎯ template interfaces.
This part of ISO 13628 is not applicable to the rework and repair of used equipment.
ISO 13628-4:2010(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 8501-1, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel
substrates and of steel substrates after overall removal of previous coatings
ISO 10423, Petroleum and natural gas industries — Drilling and production equipment — Wellhead and
christmas tree equipment
ISO 10424-1, 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 13625, Petroleum and natural gas industries — Drilling and production equipment — Marine drilling riser
couplings
ISO 13628-1, Petroleum and natural gas industries — Design and operation of subsea production systems —
Part 1: General requirements and recommendations
ISO 13628-3, Petroleum and natural gas industries — Design and operation of subsea production systems —
Part 3: Through flowline (TFL) systems
ISO 13628-7, Petroleum and natural gas industries — Design and operation of subsea production systems —
Part 7: Completion/workover riser systems
ISO 13628-8, Petroleum and natural gas industries — Design and operation of subsea production systems —
Part 8: Remotely Operated Vehicle (ROV) interfaces on subsea production systems
ISO 13628-9, Petroleum and natural gas industries — Design and operation of subsea production systems —
Part 9: Remotely Operated Tool (ROT) intervention systems
ISO 13533, Petroleum and natural gas industries — Drilling and production equipment — Drill-through
equipment
ISO 15156 (all parts), Petroleum and natural gas industries — Materials for use in H S-containing
environments in oil and gas production
ANSI/ASME B16.11, Forged Fittings, Socket-Welding and Threaded
ANSI/ASME B31.3, Process Piping
ANSI/ASME B31.4, Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids
ANSI/ASME B31.8, Gas Transmission and Distribution Piping Systems
ANSI/ISA 75.02, Control Valve Capacity Test Procedure
ANSI/SAE J517, Hydraulic Hose Fittings
ANSI/SAE J343, Test and Test Procedures for SAE 100R Series Hydraulic Hose and Hose Assemblies
API Spec 5B, Specification for Threading, Gauging, and Thread Inspection of Casing, Tubing, and Line Pipe
Threads (US Customary Units)
4 © ISO 2010 – All rights reserved

ISO 13628-4:2010(E)
ASTM D1414, Standard Test Methods for Rubber O-Rings
DNV RP B401, Cathodic Protection Design
ISA 75.01.01, Flow Equations for Sizing Control Valves
NACE No. 2/SSPC-SP 10, Joint Surface Preparation Standard: Near-White Metal Blast Cleaning
NACE SP0176, Corrosion Control of Submerged Areas of Permanently Installed Steel Offshore Structures
Associated With Petroleum Production
SAE/AS 4059, Aerospace Fluid Power — Cleanliness Classification for Hydraulic Fluids
3 Terms, definitions, abbreviated terms and symbols
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
annulus seal assembly
mechanism that provides pressure isolation between each casing hanger and the wellhead housing
3.1.2
backdriving
〈general〉 an unplanned movement in the reverse direction of an operation
3.1.3
backdriving
〈linear actuator〉 condition where the valve drifts from the set position
3.1.4
backdriving
〈manual/ROV operated choke〉 condition where the valve changes position after the operator is disengaged
3.1.5
backdriving
〈rotary actuator〉 condition where the valve continues to change position subsequent to the completion of a
positional movement
3.1.6
backdriving
〈stepping-actuated choke〉 condition where the valve changes position after the operator is disengaged
3.1.7
bore protector
device that protects internal bore surfaces during drilling or workover operations
3.1.8
check valve
device designed to prevent flow in one direction
3.1.9
choke
equipment used to restrict and control the flow of fluids and gas
ISO 13628-4:2010(E)
3.1.10
completion/workover riser
extension of the production and/or annulus bore(s) of a subsea well to a surface vessel
See ISO 13628-7.
3.1.11
conductor housing
top of the first casing string, which forms the basic foundation of the subsea wellhead and provides
attachments for guidance structures
3.1.12
corrosion cap
cap placed over the wellhead to protect it from contamination by debris, marine growth or corrosion during
temporary abandonment of the well
3.1.13
corrosion-resistant alloy
CRA
non-ferrous alloy for which any one or the sum of the specified amount of the following alloy elements
exceeds 50 %: titanium, nickel, cobalt, chromium and molybdenum
NOTE This term refers to corrosion-resistant alloys and not cracking-resistant alloys as mentioned in ISO 15156
(all parts).
3.1.14
corrosion-resistant material
CRM
ferrous or non-ferrous alloy that is more corrosion resistant than low-alloy steels
NOTE This term includes: CRAs, duplex, and stainless steels.
3.1.15
depth rating
maximum rated working depth for a piece of equipment at a given set of operating conditions
3.1.16
downstream
direction of movement away from the reservoir
3.1.17
equipment
any item or assembly to which ISO 13628-4 is applicable

3.1.18
extension sub
sealing tubular member that provides tree-bore continuity between adjacent tree components
3.1.19
fail-closed valve
actuated valve designed to fail to the closed position
3.1.20
fail-open valve
actuated valve designed to fail to the open position
3.1.21
flowline
any pipeline connecting to the subsea tree assembly outboard the flowline connector or hub
6 © ISO 2010 – All rights reserved

ISO 13628-4:2010(E)
3.1.22
flowline connector support frame
structural frame which receives and supports the flowline connector and transfers flowline loads back into the
wellhead or seabed anchored structure
3.1.23
flowline connector system
equipment used to attach subsea pipelines and/or control umbilicals to a subsea tree
EXAMPLE Tree-mounted connection systems used to connect a subsea flowline directly to a subsea tree, connect a
flowline end termination to the subsea tree through a jumper, connect a subsea tree to a manifold through a jumper, etc.
3.1.24
flow loop
piping that connects the outlet(s) of the subsea tree to the subsea flowline connection and/or to other tree
piping connections (crossover piping, etc.)
3.1.25
guide funnel
tapered enlargement at the end of a guidance member to provide primary guidance over another guidance
member
3.1.26
guideline
taut line from the seafloor to the surface for the purpose of guiding equipment to the seafloor structure
3.1.27
high-pressure riser
tubular member which extends the wellbore from the mudline wellhead or tubing head to a surface BOP
3.1.28
horizontal tree
tree that does not have a production master valve in the vertical bore but in the horizontal outlets to the side
3.1.29
hydraulic rated working pressure
maximum internal pressure that the hydraulic equipment is designed to contain and/or control
NOTE Hydraulic pressure should not be confused with hydraulic test pressure.
3.1.30
hydrostatic pressure
maximum external pressure of ambient ocean environment (maximum water depth) that equipment is
designed to contain and/or control
3.1.31
intervention fixture
device or feature permanently fitted to subsea well equipment to facilitate subsea intervention tasks including,
but not limited to,
⎯ grasping intervention fixtures;
⎯ docking intervention fixtures;
⎯ landing intervention fixtures;
⎯ linear actuator intervention fixtures;
⎯ rotary actuator intervention fixtures;
⎯ fluid coupling intervention fixtures
ISO 13628-4:2010(E)
3.1.32
intervention system
means to deploy or convey intervention tools to subsea well equipment to carry out intervention tasks,
including
⎯ ROV;
⎯ ROT;
⎯ ADS;
⎯ Diver
3.1.33
intervention tool
device or ROT deployed by an intervention system to mate or interface with an intervention fixture
3.1.34
lifting pad eye
pad eye, intended for lifting and suspending a designed load or packaged assembly
3.1.35
lower workover riser package
LWRP
unitized assembly that interfaces with the tree upper connection and allows sealing of the tree vertical bore(s)
3.1.36
mudline suspension system
drilling system consisting of a series of housings used to support casing strings at the mudline, installed from
a bottom-supported rig using a surface BOP
3.1.37
orienting bushings
non-pressure-containing parts that are used to orient equipment or tools with respect to the wellhead
3.1.38
outboard tree piping
subsea tree piping that is downstream of the last tree valve (including choke assemblies) and upstream of
flowline connection
See flow loop (3.1.24).
3.1.39
permanent guidebase
structure that sets alignment and orientation relative to the wellhead system and provides entry guidance for
running equipment on or into the wellhead assembly
3.1.40
pressure-containing part
part whose failure to function as intended results in a release of wellbore fluid to the environment
EXAMPLES Bodies, bonnets, stems.
3.1.41
pressure-controlling part
part intended to control or regulate the movement of pressurized fluids
EXAMPLE Valve-bore sealing mechanisms, choke trim and hangers.
8 © ISO 2010 – All rights reserved

ISO 13628-4:2010(E)
3.1.42
rated working pressure
RWP
maximum internal pressure that equipment is designed to contain and/or control
NOTE Rated working pressure should not be confused with test pressure.
3.1.43
re-entry spool
tree upper connection profile, which allows remote connection of a tree running tool, LWRP or tree cap
3.1.44
reverse differential pressure
condition during which differential pressure is applied to a choke valve in a direction opposite to the specified
operating direction
NOTE This can be in the operating or closed-choke position.
3.1.45
running tool
tool used to run, retrieve, position or connect subsea equipment remotely from the surface
EXAMPLES Tree running tools, tree cap running tools, flowline connector running tools, etc.
3.1.46
subsea BOP
blowout preventer designed for use on subsea wellheads, tubing heads or trees
3.1.47
subsea casing hanger
device that supports a casing string in the wellhead at the mudline
3.1.48
subsea completion equipment
specialized tree and wellhead equipment used to complete a well below the surface of a body of water
3.1.49
subsea wellhead housing
pressure-containing housing that provides a means for suspending and sealing the well casing strings
3.1.50
subsea wireline/coiled tubing BOP
subsea BOP that attaches to the top of a subsea tree to facilitate wireline or coiled tubing intervention
3.1.51
surface BOP
blowout preventer designed for use on a surface facility such as a fixed platform, jackup or floating drilling on
intervention unit
3.1.52
swivel flange
flange assembly consisting of a central hub and a separate flange rim that is free to rotate about the hub
NOTE Type
...