EN 1474-2:2020

SLOVENSKI STANDARD
01-december-2020
Nadomešča:
SIST EN 1474-2:2009
Napeljave in oprema za utekočinjeni zemeljski plin - Načrtovanje in preskušanje
obalnih pretakališč - 2. del: Načrtovanje in preskušanje cevi za pretakanje
Installation and equipment for liquefied natural gas - Design and testing of marine
transfer systems - Part 2: Design and testing of transfer hoses
Anlagen und Ausrüstung für Flüssigerdgas - Auslegung und Prüfung von
Schiffsübergabesystemen - Teil 2: Auslegung und Prüfung von Übergabeschläuchen
Installations et équipements de gaz naturel liquéfié - Conception et essais des systèmes
de transfert marins - Partie 2: Conception et essais des tuyaux de transfert
Ta slovenski standard je istoveten z: EN 1474-2:2020
ICS:
75.200 Oprema za skladiščenje Petroleum products and
nafte, naftnih proizvodov in natural gas handling
zemeljskega plina equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 1474-2
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2020
EUROPÄISCHE NORM
ICS 75.200 Supersedes EN 1474-2:2008
English Version
Installation and equipment for liquefied natural gas -
Design and testing of marine transfer systems - Part 2:
Design and testing of transfer hoses
Installations et équipements de gaz naturel liquéfié - Anlagen und Ausrüstung für Flüssigerdgas - Auslegung
Conception et essais des systèmes de transfert marins - und Prüfung von Schiffsübergabesystemen - Teil 2:
Partie 2 : Conception et essais des flexibles de transfert Auslegung und Prüfung von Übergabeschläuchen
This European Standard was approved by CEN on 19 July 2020.

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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1474-2:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and abbreviations . 5
3.1 Terms and Definitions . 5
3.2 Abbreviations . 10
4 Applications and Qualification Categories . 10
4.1 Applications . 10
4.2 Qualification Categories . 10
5 Description of typical LNG transfer hose assembly designs and accessories . 11
5.1 General . 11
5.2 Mandatory components . 11
5.3 Optional components . 12
5.4 Typical construction of LNG transfer hose assemblies . 12
5.4.1 Main hose categories . 12
5.4.2 Corrugated metal hose assemblies . 13
5.4.3 Thermoplastic multi-layer (non-vulcanized) hose assemblies (Composite hose
assemblies) . 15
5.4.4 Hose-in-hose with annular space . 16
6 Design features of the LNG transfer hoses assemblies . 17
6.1 General . 17
6.2 Transfer Hose Assembly technology design parameters . 17
6.3 Project Specific Design Parameters . 18
6.3.1 Selection of hose assembly length . 18
6.3.2 Service life . 18
6.3.3 Selection of buoyancy and submersion . 18
6.3.4 Selection of insulation . 18
6.3.5 Selection of external protection . 19
6.3.6 Selection of leak detection . 19
6.4 Component details – End fitting . 19
6.4.1 General . 19
6.4.2 Termination . 20
6.4.3 Connector . 20
6.4.4 Bending stiffener/restrictor (optional) . 20
6.5 Hose assembly handling / lifting device . 20
6.6 Safety systems . 20
6.6.1 Leak detection (optional) . 20
6.6.2 Fire safety requirements . 21
6.6.3 Electrical safety requirements . 21
6.7 Connection to the ship . 21
6.8 Hydraulic and electric control systems . 21
7 Qualification Requirements . 21
7.1 Foreword . 21
7.2 Qualification process . 22
7.2.1 General Principle . 22
7.2.2 Qualification Levels Specific Requirements . 22
7.2.3 Certification range definition from a tested hose assembly . 24
7.2.4 Certification extension and update . 25
7.3 Hose Assembly tests . 25
7.3.1 General . 25
7.3.2 Hose assembly property characterization tests . 26
7.3.3 Qualification tests with acceptance criteria . 34
8 Quality assurance and control . 44
8.1 General . 44
8.2 Material selection . 44
8.3 Manufacturing. 45
8.3.1 Manufacturing basics . 45
8.3.2 Traceability . 45
8.3.3 Marking . 45
8.3.4 Packing and Preservation . 46
8.4 Factory acceptance tests . 46
8.4.1 General . 46
8.4.2 Tests to be performed on every hose assembly . 46
9 Documentation . 46
9.1 Purchasing Guidelines . 46
9.2 Design, Qualification and Manufacturing Documentation . 46
9.3 As-built documentation/Manufacturing Data Book . 47
9.4 Operation manual . 47
Annex A (informative) Purchasing guidelines table . 49
Annex B (informative) Guidelines for additional testing program . 52
Annex C (Informative) Guidelines for Hose Qualification Categories (HQCs) Selection . 59
Annex D (informative) Surge pressure considerations for LNG hose assemblies . 61
Annex E (Informative) Pressure Leak Tests - justification about maximum allowed permeability
rate and leak detection value . 62
Bibliography . 64
European foreword
This document (EN 1474-2:2020) has been prepared by Technical Committee CEN/TC 282 “Installation and
equipment for LNG”, 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 March 2020, and conflicting national standards shall be withdrawn at
the latest by March 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 1474-2:2008.
In comparison with the previous edition, the following technical modifications have been made:
— Update of the scope
— Review of Application and introduction of Hose Qualification Categories
— Revision of hose assembly categories
— Review of design features
— Review of qualification requirements
— Review of Quality assurance and control
— Review of documentation
— Review of annexes
This series consists of 3 parts:
— EN 1474-1: Installation and equipment for liquefied natural gas — Design and testing of marine transfer
systems — Part 1: Design and testing of transfer arms
(This standard has been superseded by EN ISO 16904 - Petroleum and natural gas industries - Design and
testing of LNG marine transfer arms for conventional onshore terminals)
— EN 1474-2: Installation and equipment for liquefied natural gas — Design and testing of marine transfer
systems — Part 2: Design and testing of transfer hoses
— EN 1474-3, Installation and equipment for liquefied natural gas — Design and testing of marine transfer
systems — Part 3: Offshore transfer systems
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Republic of North Macedonia,
Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
1 Scope
This document gives general guidelines for the design, material selection, qualification, certification, and
testing details of hose assemblies for Liquefied Natural Gas (LNG) marine transfer applications.
The transfer hose assemblies are part of transfer systems (it means that they may be fitted with ERS, QCDC,
handling systems, hydraulic and electric components etc.) To avoid unnecessary repetition, cross-references
to EN ISO 16904 and EN 1474-3 are made for all compatible items, and for references, definitions and
abbreviations. Where additional references, definitions and abbreviations are required specifically for LNG
hose assemblies, they are listed in this European Standard.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements 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.
EN 1474-1:2008, Installation and equipment for liquefied natural gas — Design and testing of marine transfer
systems — Part 1: Design and testing of transfer arms
EN 1474-3:2008, Installation and equipment for liquefied natural gas - Design and testing of marine transfer
systems - Part 3: Offshore transfer systems
EN ISO 7369:2004, Pipework - Metal hoses and hose assemblies - Vocabulary (ISO 7369:2004)
EN ISO 8330:2014, Rubber and plastics hoses and hose assemblies - Vocabulary (ISO 8330:2014)
EN ISO 10012:2003, Measurement management systems - Requirements for measurement processes and
measuring equipment (ISO 10012:2003)
EN ISO 10619-1:2018, Rubber and plastics hoses and tubing - Measurement of flexibility and stiffness - Part 1:
Bending tests at ambient temperature (ISO 10619-1:2017)
EN ISO 16904:2016, Petroleum and natural gas industries - Design and testing of LNG marine transfer arms for
conventional onshore terminals (ISO 16904:2016)
3 Terms, definitions and abbreviations
3.1 Terms and Definitions
For the purposes of this document, the terms and definitions given in EN ISO 7369:2004 and
EN ISO 8330:2014 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
annular space
space between the inner fluid carrying layer and a second layer which can be used for insulation and/or safety
purposes
3.1.2
armour layer
either a braid made of wires (see braid) or strips of metal or plastic used to provide pressure strength and/or
external protection
3.1.3
axial stiffness
extent to which a hose assembly resists tensile deformation in response to an applied axial force
3.1.4
bend stiffness
ability of a flexible pipe to resist deflection when subjected to bending loads at constant tension, pressure and
temperature
3.1.5
bend restrictor
device for limiting the bend radius by mechanical means
NOTE 1 to entry: A bend restrictor typically comprises a series of interlocking metallic or moulded rings, applied over
the outer surface
3.1.6
bending stiffener
ancillary conical shaped component, which locally supports the pipe to limit bending stresses and curvature
of the pipe to acceptance levels
NOTE 1 to entry: Bend stiffeners may be either attached to an end fitting or a support structure where the flexible pipe
passes through the bend stiffener
3.1.7
boil-off gas
BOG
natural evaporation from liquefied natural gas due to vaporization
3.1.8
burst test
test conducted on a hose sample until it failed by internal pressurization
3.1.9
buoyancy
degree, to which the hose assembly has buoyancy capabilities calculated according to 7.3.2.6
3.1.10
connector
part of the end fitting used to provide a leak-tight structural connection between the end fitting and adjacent
piping
3.1.11
crush test
application of a vertical load through a beam placed laterally across the hose assembly
3.1.12
double-envelope
layer or set of layers effecting the enclosure, and thus the isolation from the environment, of those structures,
systems and components whose failure can lead to an unacceptable release of LNG
3.1.13
dynamic load
loads to flexible hose assembly or hose assembly configuration which vary in time, or whose deflections or
boundary conditions vary in time, while hose is connected
3.1.14
emergency release system
ERS
system that provides a positive means of quick release of transfer system and safe isolation of LNG carrier and
transfer system
NOTE 1 to entry: The ERS consists of an emergency release coupling (ERC) and interlocked isolating valves which
automatically close on both sides, thereby containing the LNG or vapour in the lines (dry disconnect), and, if applicable,
associated control system
3.1.15
end termination
mechanical device which forms the transition between the flexible pipe body and the connector whose
different pipe layers are terminated in the end fitting in such a way as to transfer the load between the flexible
hose assembly and the connector
3.1.16
end fitting
assembly of connector and end termination
3.1.17
emergency release coupler
ERC
device to provide a means of quick release of the transfer system when such actions is required only as an
emergency measure
3.1.18
fatigue life
number of cycles of a specified character that a given specimen sustains before failure of a specified nature
occurs
3.1.19
hose assembly
hose and its fittings
3.1.20
impact test
test for determining the impact strength of a material
3.1.21
leak detection system
system able to detect a failure / leak from the fluid carrying part of the hose assembly
3.1.22
liquefied natural gas
LNG
natural gas that has been cooled and condensed into liquid form
3.1.23
maximum allowable impact energy
MAIE
maximum impact energy which can be applied to the hose assembly without bringing permanent damage to
the hose assembly structure and performances
3.1.24
maximum allowable crush load
MACL
maximum allowable crush load which can be applied to the hose assembly without bringing permanent
damage to the hose assembly structure and performances
3.1.25
maximum allowable working pressure
MAWP
maximum pressure (gauge) across the entire specified temperature range to which the hose may be exposed
and operated
Note 1 to entry: It is commonly used by terminals to define their cargo system pressure capabilities (i.e. pump shut-in
plus any static head or cargo system safety valve relief setting.
Note 2 to entry: This pressure rating is not expected to account for dynamic surge pressures, but does include nominal
pressure variations during cargo transfer operations)
3.1.26
maximum working load
MWL
maximum allowable tensile force of the hose assembly in axial direction, applied to the end-fittings
3.1.27
minimum Bend Radius
MBR
minimum radius at which the hose assembly is designed to operate
3.1.28
non-destructive test
ND
test that is not expected to cause permanent damage to the hose assembly, so that the hose assembly can be
used in subsequent tests and for operation as well
3.1.29
owner
business entity who has the legal or rightful title to the asset intended for LNG transfer
3.1.30
proof pressure
pressure to which the hose assembly is tested (i.e. during a Factory Acceptance Test) to demonstrate its
structural integrity when subject to internal pressure
NOTE 1 to entry: According to the IMO IGC Code this pressure test at ambient temperature shall be not less than 1,5 x
MAWP and not more than two-fifths of its burst pressure
3.1.31
pumping port
connection to attach a vacuum pump for vacuum insulated hose assemblies
3.1.32
quick connect disconnect coupler
QCDC
manual or hydraulic mechanical device used to connect a transfer arm or hose to the cargo manifold without
employing bolts
3.1.33
service life
period of time during which the hose assembly fulfils all performance requirements for the specified or less
severe condition in the same Hose Qualification Category
3.1.34
static load
flexible hose assemblies not exposed to significant cyclically varying loads or deflections during normal
operations
3.1.35
storage bend radius
minimum radius at which the hose assembly is designed to be stored or handled. SBR may be lower than MBR
3.1.36
super-insulation
several high reflecting foils to reduce heat transfer via radiation as part of a vacuum insulation system
3.1.37
type approval certificate
certificate issued by an IVA confirming the suitability and appropriate limits on the manufacturer's design
methodologies, manufacturing processes and materials
Note 1 to entry: The name of this certificate can differ according to the IVA
3.1.38
visual inspection
examination of parts and equipment for visible defects in material and workmanship
3.2 Abbreviations
D internal bore diameter of the hose assembly
FAT factory acceptance test
FSRU floating Storage Regasification Unit
HQC hose qualification category
IVA Independent verification agency
L Length of flexible part of the hose assembly
LNGC liquefied natural gas carrier
MAAT Maximum allowable applied twist

4 Applications and Qualification Categories
4.1 Applications
This subclause describes the main application using LNG transfer hose assemblies.
As industry and technology is developing, other type of application may consider using LNG transfer hose
assemblies and shall be covered in this standard.
List of applications (not exhaustive):
— Offshore tandem FLNG offloading / loading aerial or floating;
— Ship-To-Ship transfer such as LNGC to FSRU, LNG Bunkering;
— Shore-To-Ship such as LNG bunkering;
— Ship-To-Shore such as offloading / loading.
Based on the application and use of the hose assembly, there are different categories of hose assembly
qualification required. Main difference are the dynamic loads on the hose assembly. The following subclause
introduces Hose assembly Qualification Categories (HQC).
NOTE Guidelines for the owners regarding applications and relevant HQC are available in Annex C. Selection of HQC
remains the owner’s responsibility.
4.2 Qualification Categories
This subclause establishes criteria for definition of Hose Qualification Categories for the hose assemblies
covered by this standard. The Hose Qualification Categories specified below define different design
verification requirements as per subclause 7.2.2.
The test scope within all Qualification Categories define the basis for the hose assemblies qualification but are
independent of each project specific data (metocean data, waves & current data,). During the design for a
project the required HQC should be checked by the owner and / or IVA.
The owner / IVA can require executing additional tests in order to determine if the proposed hose assembly
is “Fit for Purpose” (For fatigue test for example, specific attention should be paid on bending loads adjacent
to end terminations)
— Hose Qualification Category A
This HQC is intended to be used for quasi-static applications (i.e. application only driven by handling
and/or thermal and pressure fatigue).
This category is including the performance requirements applicable to all aerial transfer hose assembly,
typically transfer hose assemblies used in protected environment for intermittent usage without contact
with water and with negligible dynamic motions.
— Hose Qualification Category B
This HQC is intended to be used for dynamic applications driven by aerial transfer fatigue including
significant tensile and bending fatigue loads (e.g. by vessel motions or wind loads).
This Category is including the performance requirements applicable to all aerial transfer hose assemblies
and typically applicable for the hose assemblies used in combination of weather exposed environment
and/or permanent usage and used in configurations with contact with floating structures.
— Hose Qualification Category C
This HQC is intended to be used for dynamic applications for submerged or floating hose assemblies.
Qualification tests for this category includes representative tests of contact with water such as insulation,
water tightness properties and permanent connection potential issues.
The hose assemblies manufacturer shall propose a fatigue assessment methodology, to be applied at project
phase, verifying that the hose assembly is fit for purpose for the intended application.
The methodology shall be validated by an IVA.
5 Description of typical LNG transfer hose assembly designs and accessories
5.1 General
This standard is addressing hose assemblies as a flange-to-flange component.
It means that all statements and requirements based on the hose assemblies shall be considered between
conveyed fluid tightening surfaces at both ends.
5.2 Mandatory components
An LNG Transfer Hose assembly shall consist of the following:
— flexible part of the hose assembly
— associated end fittings
Hose extremity end fittings can permit the mounting of a QCDC or a spool piece or permit direct
connection to LNGC or LNG terminal or another hose assembly.
NOTE A description of QCDC is given in EN ISO 16904:2016, for transfer system reference is made to
EN 1474-3:2008.
Hose extremity end fittings can permit the mounting of an emergency release system with valves and ERC
(Emergency Release Coupler).
(A description of emergency release system is given in EN ISO 16904:2016 and EN 1474-3:2008).
— permanent identification marks
— hose handling device(s) (pad eye or lifting lugs, lifting collar, …),
Hose assembly shall include necessary fittings for safe handling, coupling and uncoupling either from the
LNGC or the onshore or offshore LNG terminal system as required by the system design according to
EN 1474-3:2008.
5.3 Optional components
An LNG Transfer Hose assembly can consist of the following:
— leak detection system
If required by the owner, the hose assembly shall incorporate leak detection system e.
— insulation system (to minimize build-up of external ice)
— intermediate leak barrier(s)
— bending stiffeners or restrictors
— buoyancy
— weight elements
— specific supporting equipment
Hose assembly can support (e.g. piggy back mounted) hydraulic or pneumatic hoses, electric cables for the
powering of the ERS and QCDC systems according to EN ISO 16904:2016, Clause 6.
5.4 Typical construction of LNG transfer hose assemblies
5.4.1 Main hose categories
At present LNG transfer hose assemblies are categorized in three types according to their method of
construction:
— those based on a reinforced corrugated metal hose construction, hereafter called corrugated metal hose;
— those based on a construction in which polymeric films and fabrics are entrapped between a pair of close
wound helical wires, hereafter called composite hose;
— those based on a hose-in-hose construction with annular space and which can derivate from one of the
above technologies.
— as the technology develops, other types of hose assemblies can become available and are also to be
considered covered by this European Standard.
5.4.2 Corrugated metal hose assemblies
A corrugated metal hose assembly consists of a core layer made of a stainless-steel corrugations, and several
other layers, metallic or non-metallic, reinforcing mechanical strength of the flexible part of the hose assembly.
In sequence, starting from the bore, typical construction is as follow:
a) Inner layer, made of stainless-steel corrugations (parallel of helical corrugated sometimes called bellows),
parallel or helicoidal construction. Ensures the inner leakproofness of the structure, as well as sustaining
the radial pressure.
b) Armours layers, made of steel or textile, supporting the axial loads and reinforcing inner radial pressure
resistance.
c) Optionally, thermal insulation layers, ensuring that the inner temperature is conserved whilst preventing
any build-up of ice on the exterior of the hose assembly.
d) Optionally, Outer layers, protecting the hose assembly from external mechanical damages. These layers
might be leak-proof, giving the hose assembly a double envelope (with an annulus between) thus
permitting the detection of any leak of LNG as soon as it can occur. In case of a leak in the inner layer, the
outer layer can be able to withstand some pressure at some temperature during certain amount of time.
The external layer, if leak-proof, prevents any ingress of water and air from the exterior.
The number, arrangement and sequence of the layers in steps b) to d) is specific to the hose assembly size and
application and can vary based on metallic hose assembly technology.
The hose assembly construction shall ensure that all materials are used within their individual range of
temperature.
Key
1 leakproof layer
2 insulation
3 leakproof layer
4 insulation
5 supporting layer
6 armouring
7 leakproof layer
8 corrugated inner pipe
Figure 1 — Typical hose assembly – reinforced corrugated metal hose family
Depending on the design, the outer leak proof layer can be a corrugated stainless-steel pipe similar to the inner
pipe. In this case the annular gap between inner and outer pipe can be evacuated. The pressure supervision of
this annular gap results in a leak detection of inner and outer pipe. The thermal insulation can be maintained
by layers of super insulation inside the evacuated annular gap.
Figure 2 — Typical hose assembly – Sketch of an LNG flexible hose with vacuum insulation option
5.4.3 Thermoplastic multi-layer (non-vulcanized) hose assemblies (Composite hose assemblies)
A composite hose assembly consists of un-bonded, multiple polymeric film and fabric layers bounded between
two wire helices which give the flexible part of the hose assembly its shape, one being internal and one being
external. Broadly, the film layers provide a fluid-tight barrier to the conveyed product and the fabric layers
provide the mechanical strength of the flexible part of the hose assembly. Additional layers for insulation may
be added
In sequence, starting from the bore, the construction typically consists of:
a) inner metallic wire helix applied at a pre-determined close pitch;
b) polymeric fabric layers forming the bore material;
c) pack of many polymeric film layers. The complete film pack achieves a tubular form and provides the fluid
tight barrier to the conveyed product;
d) pack of many polymeric fabric layers which reinforce the flexible part of the hose assembly;
e) outer metallic wire helix applied at half a pitch offset to the inner wire under tension. This forms the
flexible part of the hose assembly into the required convoluted structure.
The number and arrangement of the layers in steps c) and d) is specific to the hose assembly size and
application. The polymeric film and fabric materials are selected to be compatible with the conveyed product
and the extremes of operating temperature.
a)
b)
Key
1 inner wire
2 film
3 fabric
4 outer wire
Figure 3 — Typical hose assembly – composite hose family
5.4.4 Hose-in-hose with annular space
Hose assembly of this category shall comprise:
• An inner hose, based on composite hose or stainless-steel corrugated hose technologies, able to withstand
cryogenic temperatures and MAWP without limit of time.
• An annular space that can ensure one of or all the following functions:
— Thermal insulation.
Thermal insulation is achieved by filling the annulus with material of low thermal conductivity, or
by vacuuming the annulus, filled with an arrangement of metalized films and spacers (super-
insulation).
— Buoyancy
— Leak detection
• An outer hose that can ensure one of or all the following functions:
— Tightness in order to protect the inner hose from the external environment, to prevent from water
and air ingress into the annular space.
— Protection of the inner hose from impacts and crush loads.
— Protection of the inner hose from excessive loads or bending.
— Prevention of leakage or spillage in case of loss of primary containment. Proving this feature is not
addressed by this standard.
• A leak detection system able to detect a failure of the inner hose
6 Design features of the LNG transfer hoses assemblies
6.1 General
The hose assembly forms part of an overall system for the transfer of LNG – for the requirements which will
dictate the exact design of the hose assembly (e.g. static load and dynamic movements, …) refer to
EN 1474-3:2008. The design process and required information is outlined below.
Two design features categories shall be considered:
— Transfer Hose technology design parameters (listed in subclause 6.2)
These are parameters which are intrinsically related to the product and constitute the minimum
requirements to be defined for the certification of the LNG transfer hoses assemblies
— Project Specific Design Parameters (listed in subclause 6.3)
These are project related parameters that define optional additional requirements to ensure the transfer
hose assembly is fit for purpose. These parameters do not impact the certification which is based on
Transfer Hose Assembly technology design parameters.
6.2 Transfer Hose Assembly technology design parameters
Following parameters are directly related to the hose assembly design and technology and shall be established
by the manufacturer:
• Hose inner diameter for the flexible part of the hose assembly
• Connector internal diameter, if different from flexible part of the hose assembly
• Temperature range
• Maximum Allowable Velocity - This parameter shall be comprised in a range from 7 to 12m/s maximum
for liquid.
• Maximum Allowable Working Pressure
• Material compatibility:
— With conveyed fluid
— With external environment
• Maximum Allowable Twist
• Maximum Allowable Axial Load
• Minimum Bending Radius
• Storage Bending Radius
• Maximum allowable impact load for regular service conditions
• Maximum allowable crush load for regular service conditions
These parameters shall be mentioned in the Type Approval Certificate.
6.3 Project Specific Design Parameters
6.3.1 Selection of hose assembly length
The overall hose assembly length will be dictated by the system design and shall be sufficient to meet both
storage and operational conditions including motion envelopes as defined in EN 1474-3:2008
Depending on the length, system design and type, and other factors such as shipping requirements, the hose
assembly shall be either supplied as a continuous length or as a string of discrete sections.
The hose assembly length used in the system shall be such that the motion envelopes as defined in
EN 1474-3:2008 are met
Hose assembly length shall take into account the elongation of the hose assembly under pressure and its own
weight. This elongation shall be consistent with the transfer system design.
6.3.2 Service life
The required service life shall be agreed between the owner and the manufacturer based on system
requirements (see EN 1474-3:2008).
The calculation of the hose assembly service life will take into account the cumulative effects of the number
and amplitude of flexure, tensile, pressure and temperature cycles in operation, environmental ageing and the
consequences of emergency disconnections and internal pressure surge in service.
The safety ratio between service life, fatigue life and fatigue test duration shall be agreed by the owner and
the manufacturer and shall be documented.
6.3.3 Selection of buoyancy and submersion
The transfer system shall be such that the hose assembly is either floating, aerial, or the owner will specify the
degree of buoyancy if it is required
If buoyancy or submersion are required, it shall be agreed between the owner and the manufacturer based on
system requirements (see EN 1474-3:2008).
6.3.4 Selection of insulation
If required, the hose assembly shall have sufficient insulation to minimize build-up of ice on the exterior of the
hose assembly itself and to limit heat leak.
If thermal insulation is required, the maximum heat loss shall be agreed between the owner and the
manufacturer based on system requirements (see EN 1474-3:2008).
6.3.5 Selection of external protection
The hose assembly shall have sufficient external mechanical protection against accidental damages such as
dropped objects for instance, and regular service constrains such as friction, abrasion and corrosion. If
external protection is required for a higher resistance than substantiated by the manufacturer in the hose
assembly qualification program, project specific Maximum Impact Energy or the Maximum Crush Load shall
be agreed between the owner and the manufacturer.
It shall be clarified whether these parameters are related to accidental or regular service conditions based on
system requirements (see EN 1474-3:2008).
6.3.6 Selection of leak detection
See Clause 6.6.
6.4 Component details – End fitting
6.4.1 General
The end fittings of any hose assembly comprise of two main parts:
— termination;
— connector.
Illustration of an end fitting (typical, may vary depending on the hose assembly design):

Key
1 handling collar 5 termination
2 identification collar 6 end fitting
3 bending stiffener (optional) 7 flexible part of the hose assembly
4 connector
Figure 4 — Typical end fitting assembly – composite hose family
6.4.2 Termination
The termination shall ensure the following functions:
— mechanical attachment of all component layers of the hose assembly which resist against internal
pressure, traction and torsion;
— provide a leak-proof seal against the transported fluid and/or gas;
— provide a leak-proof seal against ingress of humidity or water from the outer environment.
The end fitting shall comply with the system fatigue criteria.
6.4.3 Con
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