ISO 13628-5:2002

Petroleum and natural gas industries - Design and operation of subsea production systems - Part 5: Subsea umbilicals

ISO 13628-5:2002 specifies requirements and gives recommendations for the design, material selection, manufacture, design verification, testing, installation and operation of subsea control systems, chemical injection, gas lift, utility and service umbilicals and associated ancillary equipment for the petroleum and natural gas industries. ISO 13628-5:2002 applies to umbilicals containing electrical conductors, optical fibres, thermoplastic hoses and metallic tubes, either alone or in combination. ISO 13628-5:2002 applies to umbilicals that are for static or dynamic service, and with routings of surface- surface, surface-subsea and subsea-subsea. ISO 13628-5:2002 does not apply to the associated component connectors, unless they affect the performance of the umbilical or that of its ancillary equipment.

Industries du pétrole et du gaz naturel — Conception et exploitation des systèmes de production immergés — Partie 5: Faisceaux de câbles immergés

General Information

• Status: Withdrawn
• Publication Date: 21-Oct-2002
• Withdrawal Date: 21-Oct-2002
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• Technical Committee: ISO/TC 67/SC 4 - Drilling and production equipment
• Drafting Committee: ISO/TC 67/SC 4/WG 6 - Subsea equipment
• Current Stage: 9599 - Withdrawal of International Standard
• Start Date: 11-Dec-2009
• Completion Date: 13-Dec-2025

Relations

• Revised: ISO 13628-5:2009 - Petroleum and natural gas industries - Design and operation of subsea production systems - Part 5: Subsea umbilicals
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 13628-5
First edition
2002-10-15
Petroleum and natural gas industries —
Design and operation of subsea production
systems —
Part 5:
Subsea umbilicals
Industries du pétrole et du gaz naturel — Conception et exploitation des
systèmes de production immergés —
Partie 5: Faisceaux de câbles immergés

Reference number
©
ISO 2002
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ii © ISO 2002 – All rights reserved

Contents Page
Foreword . vi
Introduction. vii
1 Scope. 1
2 Normative references. 1
3 Terms, definitions and abbreviated terms. 2
3.1 Terms and definitions. 2
3.2 Abbreviated terms. 7
4 Functional requirements . 7
4.1 General requirements . 7
4.2 Project-specific requirements. 8
5 Quality assurance . 8
6 Design requirements. 8
6.1 General . 8
6.2 Design methodology. 9
6.3 Analysis. 9
7 Component design, manufacture and test . 13
7.1 General . 13
7.2 Electric cable . 13
7.3 Performance requirements — Electric cable. 16
7.4 Structural analysis — Electric cable . 16
7.5 Manufacture — Electric cable . 17
7.6 Verification tests . 18
7.7 Component acceptance tests — Electric cable . 20
7.8 Optical fibre cable . 22
7.9 Hoses. 24
7.10 Metallic tubes. 35
8 Terminations and ancillary equipment design. 48
8.1 General . 48
8.2 Terminations. 49
8.3 Ancillary equipment. 50
9 Umbilical design. 51
9.1 Temperature range. 51
9.2 Maximum working load. 51
9.3 Minimum breaking load . 51
9.4 Minimum bend radius . 52
9.5 Dynamic service life. 52
9.6 Seabed stability . 52
9.7 Service environment. 52
9.8 Cross-sectional arrangement . 52
9.9 Lay-up. 53
9.10 Sub-bundles. 53
9.11 Inner sheath . 53
9.12 Armouring . 53
9.13 Outer sheath . 54
9.14 Length marking . 54
10 Umbilical manufacture and test. 54
10.1 Umbilical manufacture. 54
10.2 Verification tests. 56
11 Umbilical factory acceptance tests (FATs). 58
11.1 General . 58
11.2 Visual and dimensional inspection . 59
11.3 Electric cable . 59
11.4 Optical fibre cables . 59
11.5 Hoses. 59
11.6 Tubes . 60
12 Storage . 60
12.1 General . 60
12.2 Protection of umbilical services . 61
12.3 Spare length. 61
12.4 Repair kits . 61
12.5 Handling for integration tests . 61
13 Pre-installation activity . 62
13.1 Umbilical information. 62
13.2 Route information. 62
13.3 Terminations and ancillary equipment information. 63
13.4 Host facility information . 63
13.5 Subsea structure information . 63
13.6 Host facility visit. 64
14 Load-out . 64
14.1 General . 64
14.2 Technical audit of load-out facilities . 64
14.3 Load-out procedure. 65
14.4 Pre-load-out meetings . 65
14.5 Pre-load-out tests. 65
14.6 Load-out operation. 66
14.7 Stopping and starting the load-out. 67
14.8 Handling of the umbilical. 67
14.9 Load-out monitoring . 68
14.10 Load-out on a reel or carousel. 68
14.11 Post-load-out tests. 69
15 Installation operations . 69
15.1 General . 69
15.2 Requirements for installation vessel and equipment.69
15.3 Pre-installation survey. 70
15.4 I- or J-tube pull-in operations. 71
15.5 Lay-down of subsea termination (first end) . 74
15.6 Lay route . 74
15.7 Handling requirements for the main lay. 74
15.8 Vessel positioning to achieve required touch-down.75
15.9 Control and monitoring of length laid. 75
15.10 Integrity monitoring during lay . 76
15.11 Burial operations. 76
15.12 Approach to subsea termination position (second end). 77
15.13 Lay-down of subsea termination . 78
15.14 Pull-in of subsea termination. 78
15.15 Pipeline crossings. 78
15.16 Arming of weak link. 79
15.17 Post-lay survey. 79
15.18 Post-burial survey . 79
15.19 Post-pull-in test . 79
15.20 Post-hook-up test. 80
15.21 Retrieval of installation aids. 80
15.22 Contingencies. 80
15.23 Repairs . 81
iv © ISO 2002 – All rights reserved

15.24 Post-installation survey. 81
Annex A (informative) Information to be provided in a purchaser's functional specification. 82
Annex B (informative) Umbilical testing. 86
Annex C (informative) Hose and tube preferred sizes . 90
Annex D (normative) Characterization tests for hoses and umbilicals . 92
Annex E (informative) Fatigue testing . 96
Bibliography. 103

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 part of ISO 13628 may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 13628-5 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for
petroleum and natural gas industries, Subcommittee SC 4, Drilling and production equipment.
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: 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
Annex D forms a normative part of this part of ISO 13628. Annexes A, B, C and E are for information only.
vi © ISO 2002 – All rights reserved

Introduction
This part of ISO 13628 is based on API Spec 17E, second edition, September 1998, and API RP 17I, first edition
August 1996.
Users of this part of ISO 13628 should be aware that further or differing requirements may 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 engineering solutions for the individual application. This may be particularly
applicable if there is innovative or developing technology. If an alternative is offered, the vendor should identify any
variations from this part of ISO 13628 and provide details.
In this part of ISO 13628, where practical, US Customary units are included in parentheses for information.

INTERNATIONAL STANDARD ISO 13628-5:2002(E)

Petroleum and natural gas industries — Design and operation of
subsea production systems —
Part 5:
Subsea umbilicals
1 Scope
This part of ISO 13628 specifies requirements and gives recommendations for the design, material selection,
manufacture, design verification, testing, installation and operation of subsea control systems, chemical injection,
gas lift, utility and service umbilicals and associated ancillary equipment for the petroleum and natural gas
industries.
This part of ISO 13628 applies to umbilicals containing electrical conductors, optical fibres, thermoplastic hoses
and metallic tubes, either alone or in combination.
This part of ISO 13628 applies to umbilicals that are for static or dynamic service, and with routings of surface-
surface, surface-subsea and subsea-subsea.
This part of ISO 13628 does not apply to the associated component connectors, unless they affect the performance
of the umbilical or that of its ancillary equipment.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 13628. For dated references, subsequent amendments to, or revisions of, any of these publications
do not apply. However, parties to agreements based on this part of ISO 13628 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 527 (all parts), Plastics — Determination of tensile properties
ISO 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing
ISO 4080, Rubber and plastics hoses and hose assemblies — Determination of permeability to gas
ISO 4406, Hydraulic fluid power — Fluids — Method for coding the level of contamination by solid particles
ISO 4672:1997, Rubber and plastics hoses — Sub-ambient temperature flexibility tests
ISO 6801, Rubber or plastics hoses — Determination of volumetric expansion
ISO 6803, Rubber or plastics hoses and hose assemblies — Hydraulic-pressure impulse test without flexing
ISO 7751, Rubber and plastics hoses and hose assemblies — Ratios of proof and burst pressure to design working
pressure
ISO 8308, Rubber and plastics hoses and tubing — Determination of transmission of liquids through hose and
tubing walls
IEC 60228, Conductors of insulated cables
IEC 60502-1, Power cables with extruded insulation and their accessories for rated voltages from 1 kV
(U = 1,2 kV) up to 30 kV (U = 36 kV), — Part 1: Cables for rated voltages of 1 kV (U = 1,2 kV) and 3 kV
m m m
(U = 3,6 kV)
m
IEC 60502-2 Power cables with extruded insulation and their accessories for rated voltages from 1 kV
(U = 1,2 kV) up to 30 kV (U = 36 kV), — Part 2: Cables for rated voltages from 6 kV (U = 7,2 kV) up to 30 kV
m m m
(U = 36 kV)
m
IEC 60793-1-1, Optical fibres — Part 1: Generic specification — General
IEC 60793-2, Optical fibres — Part 2: Product specifications
IEC 60794-1-1, Optical fibre cables — Part 1-1: Generic specification — General
IEC 60794-1-2, Optical fibre cables — Part 1-2: Generic specification — Basic optical cable test procedures
ASTM A 370, Standard test methods and definitions for mechanical testing of steel products
ASTM A 450/A 450M, Standard specification for general requirements for carbon, ferritic alloy and austenitic alloy
steel tubes
ASTM E 562, Standard test method for determining volume fraction by systematic manual point count
ASTM G 48, Standard test methods for pitting and crevice corrosion resistance of stainless steels and related
alloys by the use of ferritic chloride solution
BS 5099, Specification for spark testing of electric cables
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this part of ISO 13628, the following terms and definitions apply:
3.1.1
ancillary equipment
accessory to the umbilical system which does not form part of the main functional purpose
EXAMPLES Weak link, buoyancy collar and I-tube or J-tube seals.
3.1.2
bend limiter
device for limiting the bend radius of the umbilical by mechanical means
NOTE It typically comprises a series of interlocking metallic or moulded rings, applied over the umbilical.
3.1.3
bend stiffener
device for limiting the bend radius of the umbilical by providing a localized increase in bending stiffness
NOTE The stiffener is usually a moulded device, sometimes reinforced, depending on the required duty, applied over the
umbilical.
2 © ISO 2002 – All rights reserved

3.1.4
bird-caging
phenomenon whereby armour wires locally rearrange with an increase and/or decrease in pitch circle diameter as
a result of accumulated axial and radial stresses in the armour layer(s)
3.1.5
bundle
laid-up functional components and associated fillers in the umbilical prior to sheathing
NOTE Typical functional components in a bundle include hoses, tubes, electric cables, optical fibre cables.
3.1.6
carousel
storage container which can be rotated by a drive about a vertical axis
NOTE It incorporates an inner core structure and an outer peripheral structure, both of which support the umbilical. The
umbilical is stored at nominally zero tension. Carousels which do not have a structure on their outer periphery to support the
umbilical are often known as turntables.
3.1.7
caterpillar
cable engine in which the umbilical is held between belts which transfer motive power to the umbilical
3.1.8
characterization data
data relating to a component or an umbilical giving an indication of performance but not giving specific
acceptance/rejection criteria
3.1.9
chinese finger
type of gripper or stopper used to hold the umbilical via its outer diameter, comprising a number of spirally
interwoven wires attached to a built-in anchorage arrangement
3.1.10
core
generic term used to describe an individual electrically insulated conductor
3.1.11
crab lay
installation deployment activity whereby the installation vessel moves sideways along, or at the end of, the
installation route
3.1.12
design life
service life multiplied by an appropriate safety factor
3.1.13
design working pressure
DWP
maximum working pressure at which a hose or tube is rated for continuous operation
3.1.14
design working load
maximum working load multiplied by an appropriate safety factor
3.1.15
end termination
mechanical fitting attached to the end of an umbilical which provides a means of transferring installation and
operating loads, fluid and electrical services to a mating assembly mounted on the subsea facility or surface facility
3.1.16
factory acceptance test
FAT
series of tests carried out on the complete umbilical system after manufacture is complete, to verify the integrity of
the umbilical
3.1.17
functional components
components included within an umbilical which are required to fulfil the operational service needs
EXAMPLES Hoses, tubes, electric/optical fibre cables.
3.1.18
functional specification
document that specifies the totality of needs expressed by features, characteristics, process conditions, boundaries
and exclusions defining the performance of a product or service including quality assurance requirements
3.1.19
host facility
fixed or floating facility to which the umbilical is mechanically and functionally connected and which provides the
functions and services to be transmitted through the umbilical
EXAMPLES Platform, buoy, floating production system.
3.1.20
hydrogen getter
medium, within an optical fibre system, that chemically neutralizes hydrogen
3.1.21
lay-up
cabling
operation of assembling electrical cores or optical fibres into a cable, or hoses, tubes, electric cables, optical fibre
cables into a bundle, or sub-bundle
3.1.22
loadout
transfer of an umbilical or umbilical system from a storage facility onto an installation/shipping vessel either by
transfer spooling or by lifting the product stored on its installation/shipping reel
3.1.23
manufacturer’s written specification
specification for the umbilical, the umbilical components and their manufacture, generated by the manufacturer in
compliance with requirements specified by the purchaser and this part of ISO 13628
NOTE The specification may comprise a multiplicity of documents (design plan, inspection and test plan, test procedures,
etc.).
3.1.24
maximum working load
maximum working tensile load that the umbilical can continuously withstand during handling and/or in the installed
configuration without suffering damage or loss of performance
NOTE As the bending radius of the umbilical decreases, the maximum working load decreases.
3.1.25
messenger wire
device installed or pre-fitted into an I-tube or J-tube for transferring the primary pulling device, usually a rope, into
the tube to provide means of pulling an umbilical through the tube
4 © ISO 2002 – All rights reserved

3.1.26
minimum bend radius
radius to which a functional component may be bent during processing, reeling and unreeling, storage and
installation, service and recovery without damage
NOTE 1 Typical functional components which may be bent include electrical/optical fibre cable, hose, tube, umbilical, etc.
NOTE 2 Minimum bend radius is measured from the centre of the bend to the functional component outer diameter on the
inside of its bend, which may vary with the load applied to the component or umbilical.
3.1.27
minimum breaking load
minimum tensile load that the umbilical can sustain before mechanical failure occurs when the load is applied with
the umbilical in a straight condition
3.1.28
moonpool
open access between a vessel deck and the sea, through which equipment and/or product is deployed
3.1.29
multi-coupler
multiway connector arrangement comprising two stabplate sub-assemblies, one of which is made of a number of
hydraulic and/or electric and/or optical coupler halves, each carrying a separate service, which mate
simultaneously with corresponding coupler halves on the other sub-assembly when the two sub-assemblies are
brought together
3.1.30
pull-in head
device used for terminating the end of an umbilical so that it can be loaded/offloaded from a vessel and pulled
along the seabed and/or through an I-tube or J-tube
NOTE In some designs the terminated armours may be used to anchor the umbilical at the top of the I-tube or J-tube. It
normally comprises a streamlined cylindrical housing into which the umbilical armouring is terminated and within which the ends
of the functional components are contained. It is usually capable of rapid disassembly to access the components for post-pull-in
tests and monitoring. A form of pull-in head may also be used at the subsea end of the umbilical.
3.1.31
reel
device for storing umbilicals or components comprising two flanges, separated by a barrel, with the barrel axis
normally being horizontal
3.1.32
service life
specified time during which the umbilical system shall be capable of meeting the functional requirements
3.1.33
S-N data
data obtained by plotting cyclic stress level versus number of cycles to failure
3.1.34
splice, verb
join together component lengths or sub-components to achieve the required production length
3.1.35
subsea termination interface
mechanism which forms the transition between the umbilical and the subsea termination or subsea umbilical
distribution unit
NOTE The interface comprises typically an umbilical armour termination, bend stiffener, hose and/or tube end fittings. If the
umbilical contains electric cables, then electrical penetrator(s) and/or electrical connectors may also be incorporated.
3.1.36
subsea umbilical distribution unit
mechanism for mechanically, electrically, optically and/or hydraulically connecting an umbilical independently to
more than one subsea system
NOTE In this context, hydraulic fluids includes production system service fluids and produced fluid, control fluid and gas lift
lines.
3.1.37
subsea umbilical termination
mechanism for mechanically, electrically, optically and/or hydraulically connecting an umbilical or jumper bundle to
a subsea system
NOTE In this context, hydraulic fluids include production system service fluids and produced fluid, control fluid, well service
fluid and gas lift lines.
3.1.38
umbilical, noun
group of electric cables, optical fibre cables, hoses, tubes, either on their own or in combination with each other,
cabled together for flexibility and oversheathed and/or armoured for mechanical strength
3.1.39
umbilical joint
means of joining together two lengths of umbilical to effect a repair or to achieve the required production length
3.1.40
umbilical system
umbilical, complete with end terminations and other ancillary equipment, installed between a fixed platform, a
floating production facility or a land-based station, and a fixed platform, a floating production system or a subsea
system, providing control, data communication and transportation of production system service fluids and/or utility
supplies
3.1.41
unaged representative sample
sample of umbilical, or its internal components, which has not previously been subjected to loadings, stresses
and/or elevated temperature
EXAMPLES Electric cables, hoses, tubes and optical fibres.
3.1.42
utility umbilical
umbilical for the provision of electric/hydraulic power, process fluids and data communications installed between
two fixed platforms, between a fixed platform and a floating facility, or between a fixed platform/floating facility and
a land-based station
3.1.43
virgin material
virgin stock
new and unused material as supplied by the material manufacturer
NOTE Virgin material or virgin stock does not comprise or contain regranulated, recycled, reprocessed, reused or other
similar material.
3.1.44
weak link
device which is used to ensure that the umbilical parts or severs at a specified load and location
6 © ISO 2002 – All rights reserved

3.2 Abbreviated terms
For the purposes of this part of ISO 13628, the following abbreviations apply:
AC alternating current
AVE apparent volumetric expansion
DC direct current
DWP design working pressure
FAT factory acceptance test
FIR full indicated reading
d inside diameter
KP kilometre point
LAT lowest astronomical tide
NDE non-destructive examination
D outside diameter
OTDR optical time-domain reflectometer
QA quality assurance
ROV remotely operated vehicle
σ specified minimum yield stress
y
TAN titrated acid number
TVE true volumetric expansion
UV ultra-violet
t wall thickness
4 Functional requirements
4.1 General requirements
4.1.1 Umbilical
The umbilical, and its constituent components, shall have the following characteristics:
a) capable of withstanding all design loads and load combinations and perform its function for the specified
design life;
b) capable of storage and operation at the specified temperatures during the design life;
c) materials: compatible with the environment to which they are exposed and in conformance with the corrosion
control and compatibility requirements;
d) electric cables: capable of transmitting power and signals with the required characteristics;
e) optical fibres: capable of transmitting signals at the required wavelengths within the attenuation requirements;
f) hoses and/or tubes: capable of transmitting fluids at the required flowrate, pressure, temperature and
cleanliness levels;
g) capable of venting, in a controlled manner, if permeation through components can occur;
h) capable of being recovered and reinstalled as defined in the manufacturer's written specification.
4.1.2 End terminations and ancillary equipment
End termination interfaces with the umbilical components are a critical area and should be addressed during the
design review stage.
End terminations and ancillary equipment shall, as a minimum, meet the same functional requirements as the
umbilical. If applicable, the following shall be demonstrated.
a) The end termination shall provide a structural interface between the umbilical and the support structure.
b) The end termination shall provide a structural interface between the umbilical and bend limiter/bend stiffener
device.
c) The end termination shall not downgrade the service life of the umbilical or the system performance below the
functional requirements.
d) Corrosion protection shall meet the design life requirement.
e) Contingency or planned recovery of the end termination to the surface during installation shall not downgrade
the service life or system performance of the umbilical.
4.2 Project-specific requirements
The purchaser shall specify the functional requirements for the umbilical.
Functional requirements not specifically required or specified by the purchaser but which may affect the design,
materials, manufacturing, testing, installation and operation of the umbilical shall be specified by the manufacturer.
NOTE 1 Annex A provides a basis for such specifications.
NOTE 2 If the purchaser does not specify a requirement and its absence does not affect any of these activities, the
manufacturer may assume there is no requirement.
5 Quality assurance
Equipment manufactured in accordance with this part of ISO 13628 shall conform to a certified quality assurance
(QA) programme. The manufacturer shall develop written specifications that describe how the QA programme will
be implemented.
6 Design requirements
6.1 General
The umbilical and its constituent components shall be designed to meet the functional and technical requirements
of this part of ISO 13628. The need for analysis shall result from a risk evaluation for the umbilical. The factors that
shall be considered are, amongst others, the environmental and service conditions for the umbilical and the
consequences of non-performance.
8 © ISO 2002 – All rights reserved

6.2 Design methodology
The design methodology shall include, as a minimum, the following:
a) description of the theoretical basis, including calculation procedures and methods for evaluating the umbilical
design parameters and the criteria to be satisfied in order to meet the functional requirements specified in
clause 4;
b) documentation of the design life assessment methodology, subject to the requirements of 6.3;
c) verification of the theoretical basis via prototype tests on component samples and on samples of the complete
umbilical as specified in 7.6, 7.8.7, 7.9.7 and 10.2. The verification shall include the capacity of all umbilical
structural layers. Simplified conservative analysis methods for checking of non-critical layers, such as anti-
wear layers, shall be acceptable if the method does not influence the reliability of the calculation of stresses in
the other layers;
d) documented basis for stress concentration factors to account for the geometry of metallic structural
components, including stress concentrations at and within the end-termination interface, clamped accessories,
contact with rigid surfaces, manufacturing tolerances, and load-induced gaps;
e) manufacturing and design tolerances, manufacturing-induced stresses, welds and other effects which
influence structural capacity.
The design methodology shall account for the effects of wear, corrosion, manufacturing processes, installation
loads, dimensional changes, creep and ageing (due to mechanical, chemical and thermal degradation) in all layers,
unless the umbilical design is documented to not suffer from such effects.
If the umbilical design is outside the envelope of previously validated designs, then the manufacturer shall perform
prototype tests to verify the design methodology for this new design. The prototype tests shall validate fitness-for-
purpose for those design parameters which are outside the previously validated envelope.
6.3 Analysis
6.3.1 General
The manufacturer shall, as part of the design evaluations, consider the results of any installation, dynamic service
and structural analysis that may have been carried out in relation to the umbilical design.
The output of the analyses shall be used to demonstrate that the umbilical is suitable for installation and will remain
fit for service during its design life.
The analysis results shall be verified either during the design verification testing or during factory acceptance
testing. In lieu of physical testing of the components/umbilical, representative historical data may be offered by the
manufacturer to verify the models or calculations used.
6.3.2 Definition of load classes
Loads are classified as functional, environmental (external) or accid
...