EN ISO 13628-7:2006

SLOVENSKI STANDARD
01-maj-2007
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Petroleum and natural gas industries - Design and operation of subsea production
systems - Part 7: Completion/workover riser systems (ISO 13628-7:2005)
Erdöl- und Erdgasindustrie - Auslegung und Betrieb von Unterwasser-
Produktionssystemen - Teil 7: Komplettierungs-/Auswältigungs-Risersysteme (ISO
13628-7:2005)
Industries du pétrole et du gaz naturel - Conception et exploitation des systemes de
production immergés - Partie 7: Systemes de liaison surface/fond de mer pour
complétion/reconditionnement (ISO 13628-7:2005)
Ta slovenski standard je istoveten z: EN ISO 13628-7:2006
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 13628-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2006
ICS 75.180.10
English Version
Petroleum and natural gas industries - Design and operation of
subsea production systems - Part 7: Completion/workover riser
systems (ISO 13628-7:2005)
Industries du pétrole et du gaz naturel - Conception et Erdöl- und Erdgasindustrie - Auslegung und Betrieb von
exploitation des systèmes de production immergés - Partie Unterwasser-Produktionssystemen - Teil 7:
7: Systèmes de liaison surface/fond de mer pour Komplettierungs-/Auswältigungs-Risersysteme (ISO 13628-
complétion/reconditionnement (ISO 13628-7:2005) 7:2005)
This European Standard was approved by CEN on 13 November 2006.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, 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: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13628-7:2006: E
worldwide for CEN national Members.

Foreword
The text of ISO 13628-7:2005 has been prepared by Technical Committee ISO/TC 67
"Materials, equipment and offshore structures for petroleum and natural gas industries” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 13628-
7:2006 by 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 2007, and conflicting national
standards shall be withdrawn at the latest by June 2007.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
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.

Endorsement notice
The text of ISO 13628-7:2005 has been approved by CEN as EN ISO 13628-7:2006 without any
modifications.
INTERNATIONAL ISO
STANDARD 13628-7
First edition
2005-11-15
Petroleum and natural gas industries —
Design and operation of subsea
production systems —
Part 7:
Completion/workover riser systems
Industries du pétrole et du gaz naturel — Conception et exploitation
des systèmes de production immergés —
Partie 7: Systèmes de liaison surface/fond de mer pour
complétion/reconditionnement
Reference number
ISO 13628-7:2005(E)
©
ISO 2005
ISO 13628-7:2005(E)
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ii © ISO 2005 – All rights reserved

ISO 13628-7:2005(E)
Contents Page
Foreword. v
Introduction . vi
1 Scope . 1
2 Normative references . 2
3 Terms, definitions, abbreviated terms and symbols. 4
3.1 Terms and definitions. 4
3.2 Abbreviated terms . 22
3.3 Symbols . 23
4 System requirements . 32
4.1 Purpose. 32
4.2 Description of C/WO riser systems. 32
4.3 System engineering. 32
4.4 System definition. 34
4.5 System design. 34
4.6 System review . 35
4.7 Modes of operation. 36
4.8 Design principles. 44
4.9 Operational principles. 44
4.10 Safety principles . 44
4.11 Barrier requirements . 45
4.12 Regulations, codes and standards . 45
4.13 Operational requirements . 47
4.14 Requirements for organization and personnel qualifications . 49
4.15 Quality system . 49
4.16 Documentation, records and traceability.49
4.17 Verification . 49
4.18 Purchaser/user’s responsibility . 50
4.19 Manufacturer’s responsibility. 50
5 Functional requirements. 50
5.1 Purpose. 50
5.2 System functional requirements . 50
5.3 Drift requirements. 51
5.4 Component requirements . 52
5.5 Workover control system. 71
6 Design requirements . 80
6.1 Purpose. 80
6.2 Design principles. 80
6.3 Loads and load effects. 83
6.4 Component design criteria . 94
6.5 Pipe design criteria. 100
6.6 Connectors . 107
6.7 Design criteria for miscellaneous components. 111
7 Materials and fabrication . 112
7.1 Introduction . 112
7.2 General material requirements. 112
7.3 Products . 120
7.4 Manufacture and fabrication. 123
7.5 Visual inspection and non-destructive testing. 126
ISO 13628-7:2005(E)
7.6 Qualification of assembly (make-up) procedures and assemblers . 128
8 Testing. 128
8.1 General . 128
8.2 Pretest requirements . 128
8.3 Pressure testing . 128
8.4 Hydraulic cleanliness . 129
8.5 Qualification testing. 129
8.6 Riser equipment and FAT. 130
8.7 Workover control system and FAT. 130
8.8 System integration tests . 131
8.9 System pressure test. 132
9 Marking, storage and shipping. 132
9.1 Riser joints. 132
9.2 Components . 134
9.3 Workover control system and hydraulic equipment . 134
10 Inspection, maintenance, reassessment and monitoring. 134
10.1 General . 134
10.2 Inspection and maintenance. 134
10.3 Reassessment of risers. 135
10.4 Monitoring. 136
11 Documentation . 136
11.1 Purpose . 136
11.2 General . 136
11.3 Design basis . 136
11.4 Design analysis . 137
11.5 Connector documentation . 139
11.6 Manufacture and fabrication. 142
11.7 As-built documentation . 142
11.8 Design and fabrication résumé. 143
11.9 Installation and operation manual(s) . 143
11.10 Condition résumé. 144
11.11 Filing of documentation . 144
Annex A (informative) Standardization of the C/WO riser interface (vertical tree) . 145
Annex B (informative) Operational modes and global riser system analysis . 148
Annex C (informative) Fatigue analysis and assessment . 166
Annex D (normative) Structural resistance methods . 195
Annex E (informative) Example calculations for pipe pressure design. 204
Annex F (informative) Purchasing guideline . 208
Annex G (informative) Bolt preload . 225
Annex H (informative) Seals . 231
Annex I (normative) Qualification of connectors . 233
Bibliography . 241

iv © ISO 2005 – All rights reserved

ISO 13628-7:2005(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 13628-7 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.
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

ISO 13628-7:2005(E)
Introduction
This part of ISO 13628 has been prepared to provide general requirements, recommendations and overall
guidance for the user to the various areas requiring consideration during development of subsea production
system. The functional requirements defined in this part of ISO 13628 allow alternatives in order to suit
specific field requirements.
This part of ISO 13628 constitutes the overall C/WO riser system standard. Functional requirements for
components comprising the system and detailed requirements for riser pipe and connector design and
analysis are included herein.
This part of ISO 13628 was developed on the basis of API RP 17G:1995, and other relevant documents on
subsea production systems.
It is necessary that the users of this part of ISO 13628 be aware that further or different requirements might 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 is probably particularly applicable where there is innovative or developing technology. Where an
alternative is offered, it is the vendor's responsibility to identify any variations from this part of ISO 13628 and
provide details.
vi © ISO 2005 – All rights reserved

INTERNATIONAL STANDARD ISO 13628-7:2005(E)

Petroleum and natural gas industries — Design and operation
of subsea production systems —
Part 7:
Completion/workover riser systems
1 Scope
This part of ISO 13628 gives requirements and recommendations for the design, analysis, materials,
fabrication, testing and operation of subsea completion/workover (C/WO) riser systems run from a floating
vessel.
It is applicable to all new C/WO riser systems and may be applied to modifications, operation of existing
systems and reuse at different locations and with different floating vessels.
This part of ISO 13628 is intended to serve as a common reference for designers, manufacturers and
operators/users, thereby reducing the need for company specifications.
This part of ISO 13628 is limited to risers, manufactured from low alloy carbon steels. Risers fabricated from
special materials such as titanium, composite materials and flexible pipes are beyond the scope of this part of
ISO 13628.
Specific equipment covered by this part of ISO 13628 is listed as follows:
⎯ riser joints;
⎯ connectors;
⎯ workover control systems;
⎯ surface flow trees;
⎯ surface tree tension frames;
⎯ lower workover riser packages;
⎯ lubricator valves;
⎯ retainer valves;
⎯ subsea test trees;
⎯ shear subs;
⎯ tubing hanger orientation systems;
⎯ swivels;
⎯ annulus circulation hoses;
ISO 13628-7:2005(E)
⎯ riser spiders;
⎯ umbilical clamps;
⎯ handling and test tools;
⎯ tree cap running tools.
Associated equipment not covered by this part of ISO 13628 is listed below:
⎯ tubing hangers;
⎯ internal and external tree caps;
⎯ tubing hanger running tools;
⎯ surface coiled tubing units;
⎯ surface wireline units;
⎯ surface tree kill and production jumpers.
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 148, Steel — Charpy impact test (V-notch)
ISO 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical
testing
ISO 783, Metallic materials — Tensile testing at elevated temperature
ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws
and studs
ISO 898-2, Mechanical properties of fasteners — Part 2: Nuts with specified proof load values — Coarse
thread
ISO 1461, Hot dip galvanized coatings on fabricated iron and steel articles — Specifications and test methods
ISO 3183 (all parts), Petroleum and natural gas industries — Steel pipe for pipelines — Technical delivery
conditions
ISO 2566-1, Steel — Conversion of elongation values — Part 1: Carbon and low alloy steels
ISO 4885, Ferrous products — Heat treatment — Vocabulary
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6892, Metallic materials — Tensile testing at ambient temperature
ISO 9327-1, Steel forgings and rolled or forged bars for pressure purposes — Technical delivery conditions —
Part 1: General requirements
ISO 9606-1, Approval testing of welders — Fusion welding — Part 1: Steels
2 © ISO 2005 – All rights reserved

ISO 13628-7:2005(E)
ISO 9712, Non-destructive testing — Qualification and certification of personnel
ISO 10423:2003, Petroleum and natural gas industries — Drilling and production equipment — Wellhead and
christmas tree equipment
ISO 10432, Petroleum and natural gas industries — Downhole equipment — Subsurface safety valve
equipment
ISO 10474, Steel and steel products — Inspection documents
ISO 10945, Hydraulic fluid power — Gas-loaded accumulators — Dimensions of gas ports
ISO 11960:2001, Petroleum and natural gas industries — Steel pipes for use as casing or tubing for wells
ISO 11961, Petroleum and natural gas industries — Steel pipes for use as drill pipe — Specification
ISO 13533:2001, Petroleum and natural gas industries — Drilling and production equipment — Drill-through
equipment
ISO 13535, Petroleum and natural gas industries — Drilling and production equipment — Hoisting equipment
ISO 13628-2, Petroleum and natural gas industries — Design and operation of subsea production systems —
Part 2: Unbonded flexible pipe systems for subsea and marine applications
ISO 13628-4:1999, Petroleum and natural gas industries — Design and operation of subsea production
systems — Part 4: Subsea wellhead and tree equipment
ISO 13628-5, Petroleum and natural gas industries — Design and operation of subsea production systems —
Part 5: Subsea umbilicals
ISO 13628-6:2000, Petroleum and natural gas industries — Design and operation of subsea production
systems — Part 6: Subsea production control systems
ISO 14693, Petroleum and natural gas industries — Drilling and well-servicing equipment
ISO 15156-1, Petroleum and natural gas industries — Materials for use in H S-containing environments in oil
and gas production — Part 1: General principles for selection of cracking-resistant materials
ISO 15156-2:2003, Petroleum and natural gas industries — Materials for use in H S-containing environments
in oil and gas production — Part 2: Cracking-resistant carbon and low alloy steels, and the use of cast irons
ISO 15156-3, Petroleum and natural gas industries — Materials for use in H S-containing environments in oil
and gas production — Part 3: Cracking-resistant CRAs (corrosion-resistant alloys) and other alloys
ISO 17025, General requirements for the competence of testing and calibration laboratories
ISO 15579, Metallic materials — Tensile testing at low temperature
1) 2)
API Spec 7 , Rotary Drill Stem Elements
API Spec 16C, Specification for Choke and Kill Systems
API RP 17B, Recommended Practice for Flexible Pipe

1) American Petroleum Institute, 1220 L Street, North West Washington, DC 20005-4070, USA.
2) For the purposes of this part of ISO 13628, API Spec 7 will be replaced by ISO 10424-1 and ISO 10424-2 when they
become publicly available.
ISO 13628-7:2005(E)
3)
ASME , Boiler and pressure vessel code, Section VIII:2001, Rules for construction of pressure vessels,
Division 1
ASME, Boiler and pressure vessel code, Section IX:2001, Welding and brazing qualification
ASTM A193, Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature
Service
ASTM A194, Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure and High
Temperature Service
ASTM A320, Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for Low-Temperature
Service
4)
ASTM A370, Standard Test Methods and Definitions for Mechanical Testing of Steel Products
ASTM A508, Standard Specification for Quenched and Tempered Vacuum-Treated Carbon and Alloy Steel
Forgings for Pressure Vessels
5)
BS 7201, Hydro-pneumatic accumulators for fluid power purposes — Part 1: Specification for seamless
steel accumulator bodies above 0,5 l water capacity
6)
EN 287-1, Qualification test of welders — Fusion welding — Part 1: Steels
EN 288 (all parts), Specification and approval of welding procedures for metallic materials
EN 1418, Welding personnel — Approval testing of welding operators for fusion welding and resistance weld
setters for fully mechanized and automatic welding of metallic materials
7)
IEC 60089-0, Electrical apparatus for explosive gas atmospheres — Part 0: General Requirements, Fourth
Edition
8)
MSS SP-25, Standard Marking Systems for Valves, Fittings, Flanges and Unions
9)
SAE AS 4059, Aerospace fluid power — Cleanliness classification for hydraulic systems
3 Terms, definitions, abbreviated terms and symbols
For the purposes of this document, the following terms, definitions, abbreviations and symbols apply.
3.1 Terms and definitions
3.1.1
accidental load
load(s) which are imposed on the C/WO riser system under abnormal and unplanned conditions
EXAMPLES Loss of vessel station-keeping and heave compensator lock-up.

3) ASME International, Three Park Avenue, New York, NY 10016-5990, USA.
4) American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, USA.
5) British Standards Institution, 389 Chiswick High Road, London W4 4AL, UK.
6) European Committee for Standardization, 36 rue de Stassart, B-1050, Brussels, Belgium.
7) International Electrotechnical Commission, IEC Central Office, 3, rue de Varembé, P.O. Box 131, CH-1211 Geneva 20,
Switzerland.
8) Manufactures Standardization Society of the Valve & Fitting Industry, 127 Park Street, N.E., Vienna, VA 22180, USA.
9) SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, USA.
4 © ISO 2005 – All rights reserved

ISO 13628-7:2005(E)
3.1.2
agreement
unless otherwise indicated, “by agreement” means “by agreement between manufacturer and purchaser at the
time of enquiry and order”
3.1.3
apparent weight
weight in water
wet weight
net lift
submerged weight
effective weight
submerged weight including content minus buoyancy
3.1.4
attachment weld
fillet or full penetration weld used for attachment of components to pipe or coupling
3.1.5
auxiliary line
conduit (excluding choke and kill lines) attached to the outside of the riser main pipe
EXAMPLES Hydraulic supply line and annulus circulation line.
3.1.6
ball joint
ball and socket assembly having a central through-passage equal to or greater than the riser internal diameter
NOTE This can be positioned in the riser string to reduce local bending stresses.
3.1.7
barrier
one or several barrier elements that are designed to prevent unintended flow of formation fluid
3.1.8
barrier element
device that, alone, cannot prevent flow from one side to the other side of itself
3.1.9
bearing stress
average normal stress on the contact surfaces of mating surfaces
3.1.10
blow-out preventer
BOP
device installed at the wellhead to contain well-bore pressure either in the annular space between the casing
and the tubulars or in an open hole during drilling, completion, testing or workover
3.1.11
BOP stack
assembly of well control equipment including BOPs, spools, valves, hydraulic connectors, and nipples that
connect to the subsea wellhead
NOTE As commonly used, this term sometimes includes the LMRP.
ISO 13628-7:2005(E)
3.1.12
BOP adapter joint
BOP spanner joint
tubing hanger orientation joint
specialized C/WO riser joint used when the C/WO riser is deployed inside a drilling riser and subsea BOP to
install and retrieve an orientated subsea tubing hanger
3.1.13
BOP stack
assembly of well control equipment including BOPs, spools, valves, hydraulic connectors and nipples that
connects to the subsea wellhead
NOTE As commonly used, this term sometimes includes the LMRP.
3.1.14
buoyancy module
structure of low-mass material, usually foamed polymers strapped or clamped to the exterior of riser joints, to
reduce the submerged mass of the riser
3.1.15
calculation
use of analytical-based formulas or numerical-based methods, e.g. finite element method or boundary element
method, to investigate the structural safety of a component/system
3.1.16
Charpy V-notch test
test to indicate fracture toughness in terms of energy absorbed or lateral expansion or fracture appearance
3.1.17
choke-and-kill line
external conduits, arranged laterally along the riser pipe, and used to circulate fluids into and out of the
wellbore to control well pressure
3.1.18
connector
mechanical device used to connect adjacent components in the riser system to create a structural joint resisting
applied loads and preventing leakage
EXAMPLES Threaded types, including (i) one male fitting (pin), one female fitting (integral box) and seal ring(s), or (ii)
two pins, a coupling and seal sea ring(s); flanged types, including two flanges, bolts and a gasket/seal ring; clamped hub
types, including hubs, clamps, bolts and seal ring(s); dog-type connectors.
3.1.19
control module
assembly of subsea control equipment for piloted or sequential hydraulic or electrohydraulic operations from
surface
NOTE Can be configured as a riser control module used for operation of landing strings in tubing hanger mode or as
a workover control module in tree mode for operation of the lower workover package.
3.1.20
completion riser
temporary riser that is designed to run inside a BOP and drilling riser to allow for well completion
NOTE Completion operations are performed within the drilling riser. A completion riser can also be used for open-sea
workover operations.
6 © ISO 2005 – All rights reserved

ISO 13628-7:2005(E)
3.1.21
completion/workover riser
C/WO riser
temporary riser used for completion or workover operations
3.1.22
component
part of the pressure-containing equipment, which can be considered as an individual item for the calculation
NOTE Includes structural components like pipes, connectors, stress joints, tension joints, landing blocks, slick joints,
tubing hanger orientation joints, adapter joints, etc.
3.1.23
corrosion allowance
amount of wall thickness added to the pipe or component to allow for corrosion, scaling, abrasion, erosion,
wear and all forms of material loss
3.1.24
crack tip opening displacement
CTOD
measure of crack severity that can be compared against a critical value at the onset of crack propagation
3.1.25
design basis
set of project-specific design data and functional requirements that are not specified or are left open in the
general standard
3.1.26
design check
assessment of a component for a load case by means of an application rule
3.1.27
design criteria
quantitative formulations which describe each failure mode the conditions shall fulfil
3.1.28
design factor
factor (usage factor) used in working stress design
3.1.29
design life
period for which a riser can be used for its intended purpose with anticipated maintenance but without
substantial repair or replacement being necessary including storage and working periods
NOTE The design life includes the entire period from start of manufacture to condemnation of the C/WO riser system
or part of the system.
3.1.30
design load
combination of load effects
3.1.31
design material strength
stress used for structural strength calculation
3.1.32
design pressure
maximum difference between internal pressure and external pressure that is unlikely to be exceeded during
the life of the riser, referred to a specified reference height
ISO 13628-7:2005(E)
NOTE Design pressure is often named maximum allowable pressure or rated working pressure or maximum
allowable.
EXAMPLE Design pressure is the maximum pressure considering shut-in pressure at the wellhead (seabed) or at
the top of the riser with subsea valves open, maximum well fracturing pressure, maximum well injection pressure,
maximum surge pressure or maximum well kill pressure.
3.1.33
designer
individual or organization that takes the responsibility for the design of C/WO riser systems conforming with
requirements of this part of ISO 13628
3.1.34
drift
cylindrical mandrel for verifying drift diameter of individual and assembled equipment
3.1.35
meter
minimum diameter that allows for the passage of the drift
3.1.36
drift-off
unintended lateral movement of a dynamically positioned vessel off its intended location relative to the
wellhead, generally caused by loss of station-keeping control or propulsion
3.1.37
drill pipe riser
single string of drill pipe with an attached hydraulic control umbilical and annulus umbilical
3.1.38
drilling riser
system used with floating drilling vessel for guiding the drill string and circulating fluids between the drilling
vessel and the subsea BOP
3.1.39
drive-off
unintended movement of a dynamically positioned vessel off location driven by the vessel's main propulsion or
station-keeping thrusters
3.1.40
dynamic positioning
computerized means of maintaining a vessel on location by selectively activating thrusters
3.1.41
effective tension
axial tension calculated at any point along a riser by considering only the top tension and the apparent weight
of the riser and its contents (tension positive)
NOTE Global buckling and geometric stiffness is governed by the effective tension.
3.1.42
emergency disconnect package
subsea equipment package that typically forms part of the lower workover riser package and provides a
disconnection point between the riser and subsea equipment
NOTE This equipment is used when it is required to disconnect the riser from the well, typically in case of a vessel
drift-off or other emergency that could move the vessel away from the well location.
8 © ISO 2005 – All rights reserved

ISO 13628-7:2005(E)
3.1.43
emergency quick-disconnect
automatic activation of an emergency shutdown followed by an automatic disconnect of the riser
3.1.44
emergency shutdown
controlled sequence of events that ensures that the well is secured against accidental release of
hydrocarbons into the environment, i.e. closing of barrier elements
3.1.45
environmental loads
loads due to the environment
EXAMPLES Waves, current and wind.
3.1.46
environmental seal
outermost pressure-containing seal at a connector interface
NOTE This seal normally separates a pressurized medium from the surrounding environment.
3.1.47
fabricator
individual or organization that takes the responsibility for the fabrication of C/WO riser systems conforming
with the requirements of this part of ISO 13628
3.1.48
factory acceptance test
FAT
test conducted by the manufacturer to verify that the manufacture of a specific assembly meets all intended
functional and operational requirements
3.1.49
fail-safe
term applied to equipment or a system so designed that, in the event of failure or malfunction of any part of the
system, devices are automatically activated to stabilize or secure the safety of the operation
3.1.50
failure
event causing an undesirable condition, e.g. loss of component or system function, or deterioration of
functional capability to such an extent that the safety of the unit, personnel or environment is significantly
reduced
EXAMPLE Structural failure (excessive yielding, buckling, rupture, leakage) or operational limitations (slick joint
protection length, clearance).
3.1.51
false rotary
component that sits on the drilling rotary and provides a slip profile for single, dual or triple tubing strings
NOTE This allows the workover control system umbilical to feed into the drilling riser without interfering with the slips.
3.1.52
fatigue analysis
conventional stress-life fatigue analysis using material S-N curves and specified fatigue design factors
3.1.53
fatigue crack growth analysis
analysis of crack growth from assumed initial defect size under the action of cyclic loading
NOTE Used to determine fabrication inspection requirements and in-service inspection plans.
ISO 13628-7:2005(E)
3.1.54
finite element analysis
numerical method for analysing dynamic and static response, by dividing the structure into small continuous
elements with the given material properties
NOTE The analysis can be local or global.
3.1.55
flex joint
laminated metal and elastomer assembly, having a central through-passage equal to or greater in diameter
than the interfacing pipe or tubing bore, that is positioned in the riser string to reduce the local bending
stresses
3.1.56
floating vessel
buoyant installation that is floating and positioned relative to the sea bottom by station-keeping systems
NOTE The following types of station-keeping systems are normally considered: catenary mooring systems and
dynamic positioning systems based on thrusters. Combination of station-keeping systems can be considered.
EXAMPLE Semi-submersible drilling vessels and drill ships.
3.1.57
fluid
gases, liquids and vapour in pure phases as well as mixtures thereof
3.1.58
fractile
p-fractile (or percentile) a
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