1、February 2009DEUTSCHE NORM English price group 15No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 75.200!$Uzj“1508771ww
2、w.din.deDDIN EN 1474-2Installation and equipment for liquefied natural gas Design and testing of marine transfer systems Part 2: Design and testing of transfer hosesEnglish version of DIN EN 1474-2:2009-02Anlagen und Ausrstung fr Flssigerdgas Auslegung und Prfung von Schiffsbergabesystemen Teil 2: A
3、uslegung und Prfung von bergabeschluchenEnglische Fassung DIN EN 1474-2:2009-02www.beuth.deDocument comprises 33 pagesDIN EN 1474-2:2009-02 2 Start of validity This standard takes effect on 1 February 2009. National foreword This standard includes safety requirements. This standard has been prepared
4、 by Technical Committee CEN/TC 282 “Installation and equipment for LNG” (Secretariat: AFNOR, France). The responsible German body involved in its preparation was the Normenausschuss Gastechnik (Gas Technology Standards Committee). It is intended to include this standard in the body of Codes of pract
5、ice for gas issued by the DVGW Deutscher Verein des Gas- und Wasserfaches e.V. (German Association of Gas and Water Engineers). EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1474-2December 2008ICS 75.200English VersionInstallation and equipment for liquefied natural gas - Design andtesting of ma
6、rine transfer systems - Part 2: Design and testing oftransfer hosesInstallations et quipements de gaz naturel liqufi -Conception et essais des systmes de transfert marins -Partie 2: Conception et essais des tuyaux de transfertAnlagen und Ausrstung fr Flssigerdgas - Auslegung undPrfung von Schiffsber
7、gabesystemen - Teil 2: Auslegungund Prfung von bergabeschluchenThis European Standard was approved by CEN on 1 November 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard wit
8、hout any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language
9、made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,Franc
10、e, 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 STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORM
11、UNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1474-2:2008: EEN 1474-2:2008 (E) 2 Contents Page Foreword4 1 Scope 5 2 Normative references 5 3 Terms, definitions and abb
12、reviations5 4 Description of typical LNG transfer hose designs and accessories6 4.1 A LNG transfer hose system shall consist of the following6 4.1.1 A flexible hose assembly, comprising.6 4.1.2 Connection system to LNGC6 4.1.3 Emergency release system.6 4.1.4 Handling7 4.1.5 Power systems.7 4.1.6 Le
13、ak detection, monitoring and alarm systems .7 4.2 Typical construction of LNG transfer hoses.7 4.2.1 Main hose categories 7 4.2.2 Corrugated metal hoses7 4.2.3 Composite hoses.9 5 Design features of the LNG transfer hoses and transfer hoses assemblies.10 5.1 General10 5.2 Application data required .
14、10 5.3 Selection of hose length .10 5.4 Service life 11 5.5 Selection of hose size .11 5.6 Selection of buoyancy.11 5.7 Selection of insulation 11 5.8 Basic design parameters 11 5.9 Component details End fitting.11 5.9.1 General11 5.9.2 Termination 12 5.9.3 Connector .13 5.9.4 Bending stiffener/rest
15、rictor (optional).13 5.10 Hose handling / lifting device.13 5.11 Safety systems.13 5.12 Connection to the ship14 5.13 Hydraulic and electric control systems.14 6 Inspection and tests 14 6.1 Foreword.14 6.2 Laboratory testing .15 6.3 Prototype hose testing15 6.4 Factory acceptance tests18 6.4.1 Gener
16、al18 6.4.2 All hoses .18 6.4.3 FAT tests on one hose per order .18 6.5 System testing .18 7 Quality assurance and control .18 7.1 General18 7.2 Material selection.18 7.3 Marking .19 7.4 Manufacturing 19 7.5 Documentation related to an approved certification process: .19 DIN EN 1474-2:2009-02 EN 1474
17、-2:2008 (E) 3 8 Documentation.19 8.1 For information a purchasing guidelines table is given in Annex A19 8.2 As-built documentation.19 8.3 Operation manual 20 Annex A (informative) Purchasing guidelines table 21 Annex B (normative) Prototype and factory acceptance tests for LNG hose assemblies27 Ann
18、ex C (informative) Surge pressure considerations for LNG hoses.29 Bibliography31 DIN EN 1474-2:2009-02 EN 1474-2:2008 (E) 4 Foreword This document (EN 1474-2:2008) has been prepared by Technical Committee CEN/TC 282 “Installation and equipment for LNG”, the secretariat of which is held by AFNOR. Thi
19、s 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 2009, and conflicting national standards shall be withdrawn at the latest by June 2009. Attention is drawn to the possibility that some of the ele
20、ments of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This European Standard consists of 3 parts: EN 1474-1: Installation and equipment for liquefied natural gas Design and testing of marine transfe
21、r systems Part 1: Design and testing of transfer arms 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 marin
22、e transfer systems Part 3: Offshore transfer systems According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France
23、, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. DIN EN 1474-2:2009-02 EN 1474-2:2008 (E) 5 1 Scope This European Standard gives general guidel
24、ines for the design, material selection, qualification, certification, and testing details for Liquefied Natural Gas (LNG) transfer hoses for offshore transfer or on coastal weather-exposed facilities for aerial, floating and submerged configurations or a combination of these. Whilst this European S
25、tandard is applicable to all LNG hoses, it is acknowledged that there may be further specific requirements for floating and submerged hoses. The transfer hoses will be designed to be part of transfer systems (it means that they will be fitted with ERS, QCDC, handling systems, hydraulic and electric
26、components etc.) To avoid unnecessary repetition, cross-references to EN 1474-1 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 hoses, they are listed in
27、this European Standard. Transfer hoses need to be durable when operating in the marine environment and to be flexible with a minimum bending radius compatible with handling and the operating requirements of the transfer system. 2 Normative references The following referenced documents are indispensa
28、ble 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. EN 1474-1:2008, Installation and equipment for liquefied natural gas Design and testing of marine
29、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 1746, Rubber or plastic hoses and tubings Bending tests (ISO 1746:1998, including t
30、echnical corrigendum 1:1999) EN ISO 7369, Pipework Metal hoses and hoses assemblies Vocabulary (ISO 7369:2004) EN ISO 8330, Rubber and plastic hoses and hoses assemblies Vocabulary (ISO 8330:2007) EN ISO 9000, Quality management systems Fundamentals and vocabulary (ISO 9000:2005) EN ISO 9001, Qualit
31、y management system Requirements (ISO 9001:2000) 3 Terms, definitions and abbreviations For the purposes of this document, the terms and definitions given in EN ISO 7369 and EN ISO 8330 apply. NOTE 1 Exception to the above: for this document, the bending radii are measured from the centre line. NOTE
32、 2 For the purpose of this document hose assembly means the hose complete with end fittings, hose handling and lifting devices (pad eyes, collars, ), as described in 4.1.1. NOTE 3 For the purpose of this document, MAWP is defined in Clause 6 and Annex C. NOTE 4 For the purpose of this document, D an
33、d ND are defined in Clause 6. DIN EN 1474-2:2009-02 EN 1474-2:2008 (E) 6 3.1 owner (or designated agent) company or group of companies for whose use the hose assembly as defined in 4.1.1 is provided 3.2 vendor company selling the hose assembly to the owner, and in charge of completing the hose assem
34、bly as defined in 4.1.1 4 Description of typical LNG transfer hose designs and accessories 4.1 A LNG transfer hose assembly shall consist of the following 4.1.1 A flexible hose assembly, comprising flexible hose, refer to 4.2; associated end terminations and connectors; permanent identification mark
35、s; hose handling device(s) (padeye or lifting lugs, lifting collar, ), and if required: leak detection system; insulation system (to minimize build up of external ice); intermediate leak barrier(s); bending stiffeners or restrictors; buoyancy. 4.1.2 Connection system to LNGC Hose extremity connector
36、 flanges shall permit the mounting of a QCDC or a spool piece or permit direct connection to LNGC or LNG terminal or another hose assembly. (A description of QCDC is given in EN 1474-1, for transfer system reference is made to EN 1474-3). Hubs, or other connectors if equivalent or superior to flange
37、s, may be used if agreed between owner and vendor. 4.1.3 Emergency release system Hose extremity connector shall 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 1474-1 and EN 1474-3). DIN EN
38、 1474-2:2009-02 EN 1474-2:2008 (E) 7 4.1.4 Handling Hose 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 (refer to EN 1474-3). 4.1.5 Power systems Hose may support (e.g. p
39、iggy back mounted) hydraulic or pneumatic hoses, electric cables for the powering of the ERS and QCDC systems (refer to EN 1474-1:2008, Clause 6). 4.1.6 Leak detection, monitoring and alarm systems If required by the owner the hose shall incorporate leak detection system e.g. gaseous nitrogen bleedi
40、ng in the annular space (see 5.11). 4.2 Typical construction of LNG transfer hoses 4.2.1 Main hose categories At present LNG transfer hoses are categorized in two types according to their method of construction: those based on a reinforced corrugated metal hose construction, hereafter called corruga
41、ted 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; as the technology develops, other types of hose may become available and are also to be considered covered by this European S
42、tandard. 4.2.2 Corrugated metal hoses 4.2.2.1 Hose Inner layer The inner layer is made of stainless steel corrugations (sometimes called bellows). This ensures the inner leak-proofness of the structure, as well as sustaining the inner radial pressure. Armour layers (if required) These armour layers
43、support the axial loading whilst providing an initial thermal insulation. Spiral layer (if required) This layer ensures that the armours remain in place, as well as providing some thermal insulation. Thermal insulation layers This layer (or series of layers) ensures that the inner temperature is con
44、served whilst preventing any build-up of ice on the exterior of the hose. Intermediate and outer leak-proof layers The intermediate sheath gives the hose a double annulus, thus permitting the detection of any leak of LNG as soon as it may occur. The external sheath prevents any ingress of water from
45、 the exterior. DIN EN 1474-2:2009-02 EN 1474-2:2008 (E) 8 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 corruga
46、ted 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 may be evacuated. The pressure super
47、vision of this annular gap results in a leak detection of inner and outer pipe. The thermal insulation may be maintained by layers of super insulation inside the evacuated annular gap. DIN EN 1474-2:2009-02 EN 1474-2:2008 (E) 9 Key 1 pumping port 2 armouring 3 corrugated outer pipe 4 corrugated inne
48、r pipe 5 super insulation vacuum 6 vacuum supervision leak detection Figure 2 Typical hose assembly Sketch of a LNG flexible hose with vacuum insulation option 4.2.2.2 End fitting assembly The end fitting assembly is made of stainless steel, and ensures 2 primary functions. The flexible termination
49、incorporates the different layers of the flexible and ensures the integrity of each layer at its end. The construction is designed to allow the immediate detection of any LNG leak into the inner annulus. The end connector is connected to the associated piping at each end of the flexible. This will typically be a standard ANSI flange. 4.2.3 Composite hoses A composite hose consists of un-bonded, multiple polymeric film and fabric layers trapped between two w
