06-30158810-DC.pdf

a Date: 6 December 2006 Origin: European Latest date for receipt of comments: 31 March 2007 Project no.: 2006/03154 Responsible committee: GSE/38 Installation and equipment for LNG Interested committees: Title: Draft BS prEN 1474-2 Installation and equipment for liquefied natural gas - Design and testing of marine transfer systems - Part 2: Design and testing of transfer hoses Supersession information: If this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede NONE . If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 March 2007. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. See overleaf for information on commenting. 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Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Service on the BSI web site http:/www.bsi-global.com. Direct tel: 020 8996 7009 Responsible Committee Secretary: Committee Service Centre (BSI) E-mail: cscbsi-global.com Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 6.1 DPC: 06/30158810 DC Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:30:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI b Introduction This draft standard is based on European discussions in which the UK took an active part. Your comments on this draft are welcome and will assist in the preparation of the consequent British Standard. If no comments are received to the contrary, then the UK will approve this draft and implement it as a British Standard. Comment is particularly welcome on national, legislative or similar deviations that may be necessary. Even if this draft standard is not approved by the UK, if it receives the necessary support in Europe, the UK will be obliged to publish the official English Language text unchanged as a British Standard and to withdraw any conflicting standard. UK Vote Please indicate whether you consider the UK should submit a negative (with reasons) or positive vote on this draft. Submission The guidance given below is intended to ensure that all comments receive efficient and appropriate attention by the responsible BSI committee. Annotated drafts are not acceptable and will be rejected. All comments must be submitted, preferably electronically, to the Responsible Committee Secretary at the address given on the front cover. Comments should be compatible with Version 6.0 or Version 97 of Microsoft® Word for Windows, if possible; otherwise comments in ASCII text format are acceptable. Any comments not submitted electronically should still adhere to these format requirements. All comments submitted should be presented as given in the example below. Further information on submitting comments and how to obtain a blank electronic version of a comment form are available from the BSI web site at:http:/www.bsi-global.com/British_Standards/Getting_involved/DPCs/instructions.xalter Template for comments and secretariat observations Date: xx/xx/200x Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) MB Clause No./ Subclause No./ Annex (e.g. 3.1) Paragraph/ Figure/Table/ Note (e.g. Table 1) Type of com- ment Comment (justification for change) by the MB Proposed change by the MB Secretariat observations on each comment submitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read . so that the mains connector to which no connection . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. Delete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:30:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM DRAFT prEN 1474-2 November 2006 ICS 75.200 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 - Conception et essais des systèmes de transfert marins - Partie 2: Conception et essais des tuyaux de transfert This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 282. If this draft becomes a European Standard, 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. This draft European Standard was established by CEN 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 Management Centre 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. Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation. Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels © 2006 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. prEN 1474-2:2006: E Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:30:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI prEN 1474-2:2006 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references4 3 Terms, definitions and abbreviations4 4 Description of typical LNG transfer hose designs and accessories4 5 Design features of the LNG transfer hoses and transfer hoses assemblies.9 6 Inspection and tests14 7 Quality Assurance and Control18 8 Documentation.19 Annex A (informative) Purchasing Guidelines table20 Annex B (normative) Type approval and routine tests for LNG hoses and hoses assemblies.26 Bibliography28 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:30:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI prEN 1474-2:2006 (E) 3 Foreword This document (prEN 1474-2:2006) has been prepared by Technical Committee CEN/TC 282 “Installation and equipment for LNG”, the secretariat of which is held by AFNOR. This document is currently submitted to the CEN Enquiry. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:30:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI prEN 1474-2:2006 (E) 4 1 Scope This part of EN 1474 gives general guidelines for the design, material selection, qualification, certification, and testing details for Liquefied Natural Gas (LNG) transfer hose for offshore transfer or on coastal weather- exposed facilities. To avoid unnecessary repetition, cross-reference to EN 1474-1 Design and Testing of Transfer Arms, is 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 this part. For details of specific LNG transfer system architectures reference should be made to EN 1474-3. Hoses used for LNG transfer are normally large bore: typically from DN 250 (10”) to above DN 400 (16”) and more, with working design pressures in the range of 10 bar to 20 bar in order to meet the minimum flow rate from the facility of 10 000 m3/hour with a practical number of hoses used for LNG transfer and vapour return. Transfer hoses have 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 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. EN 1474-1, Installation and Equipment for Liquefied Natural Gas Design and Testing of Marine Transfer Systems Part I: Design and Testing of Transfer Arms. EN 1474-3, Installation and Equipment for Liquefied Natural Gas Design and Testing of Marine Transfer Systems Part III: Offshore Transfer Systems. 3 Terms, definitions and abbreviations For the purposes of this document, the terms and definitions given in EN ISO 7369:2004 “Pipework Metal hoses and hose assemblies Vocabulary“ and EN ISO 8330:2002 “Rubber and plastic hoses and hose assemblies Vocabulary“ apply. 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 clause 4.1.1. 4 Description of typical LNG transfer hose designs and accessories 4.1 A LNG transfer hose system shall consist of the following 4.1.1 A flexible hose assembly, comprising an inner leak-proof barrier to provide primary flow path and containment; reinforcement layers to provide structural support; an exterior leak-proof barrier to provide an external protection (note: this depends on the hose design, see clause 4.2); the associated end terminations and connectors; Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:30:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI prEN 1474-2:2006 (E) 5 identification collars, and if required: a leak detection system; an insulation system (to minimize build up of external ice); intermediate leak barrier(s); bending stiffeners or restrictors; hose handling device(s) (padeye or lifting lugs, lifting collar, ); buoyancy. NOTE The leak proof barrier of a composite hose is comprised of many individual layers forming a labyrinth seal. 4.1.2 Connection System to LNGC The hose extremity connector 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 clause 6). Hubs, or other connectors if equivalent or superior to flanges, may be used if agreed between Purchaser and Vendor. 4.1.3 Emergency Release System The 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 clause 5 and EN 1474-3 clause 7). 4.1.4 Handling The hose shall include necessary fittings for safe handling, coupling 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 standard. 4.2.1 Corrugated metal hoses 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 armours sustain 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 conserved 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 the exterior. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:30:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI prEN 1474-2:2006 (E) 7 Key 1 Leakproof Layer 2 Insulation 3 Leakproof Layer 4 Insulation 5 Frette 6 Armours 7 Leakproof Layer 8 Inner Corrugated Bellows Figure 1 Typical hose reinforced corrugated metal hose family Depending on the design, the outer leak proof layer can be a corrugated stainless steel hose similar to the inner hose. In this case the annular gap between inner and outer hose may be evacuated. The pressure supervision of this annular gap results in a leak detection of inner and outer hose. The thermal insulation is maintained by layers of super insulation inside the evacuated annular gap. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:30:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI prEN 1474-2:2006 (E) 8 Key 1 Pumping port 2 Armouring 3 Corrugated outerpipe 4 Corrugated innerpipe 5 Super insulation vacuum 6 Vacuum supervision Leal detection Figure 2 Sketch of a LNG flexible hose with vacuum installation option The metal hose construction shall ensure that all materials are used within their individual range of temperature. End fitting assembly: The end fitting assembly is made of stainless steel, and ensures 2 primary functions. The flexible termination, which incorporates the diff