1、Ships and marine technology Offshore mooring chainsBS ISO 20438:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 ISO 2017Ships and marine technology Offshore mooring chainsNavires et technologie maritime Chanes damarrage en haute merINTERNATIONAL STANDARDISO20438
2、First edition2017-06Reference numberISO 20438:2017(E)National forewordThis British Standard is the UK implementation of ISO 20438:2017.The UK participation in its preparation was entrusted to Technical Committee SME/32, Ships and marine technology - Steering committee.A list of organizations represe
3、nted on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580
4、89812 9ICS 47.040Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS
5、ISO 20438:2017 ISO 2017Ships and marine technology Offshore mooring chainsNavires et technologie maritime Chanes damarrage en haute merINTERNATIONAL STANDARDISO20438First edition2017-06Reference numberISO 20438:2017(E)BS ISO 20438:2017ISO 20438:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECT
6、ED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior w
7、ritten permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 20438:2
8、017ISO 20438:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including phot
9、ocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 74
10、9 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgISO 20438:2017(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Grade . 25 Materials . 26 Shape, dimensions and tolerances . 3Bibliography .22 ISO 2017 All rights reserved iiiContents PageBS ISO 20438:2017ISO 20438:201
11、7(E)ForewordISO (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
12、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 matt
13、ers of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This doc
14、ument was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or al
15、l such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users
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17、o Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by ISO/TC 8, Ships and marine technology, SC 4, Outfitting and deck machinery.iv ISO 2017 All rights reservedBS ISO 20438:2017ISO 20438:2017(E)ForewordISO (the International Organization for Standardiz
18、ation) 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
19、 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.The procedures used to
20、 develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of th
21、e ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified
22、during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on t
23、he voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ forew
24、ord .html.This document was prepared by ISO/TC 8, Ships and marine technology, SC 4, Outfitting and deck machinery.iv ISO 2017 All rights reserved INTERNATIONAL STANDARD ISO 20438:2017(E)Ships and marine technology Offshore mooring chains1 ScopeThis document specifies the requirements for grades, ma
25、terials, shapes, proportions, dimensions and tolerances of offshore mooring chains.2 Normative referencesThe 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
26、. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 4967, Steel Determination of content of non-metallic inclusions Micrographic method using standard diagramsASTM A255, Standard test methods for determining hardenability of steelASTM E112,
27、Standard test methods for determining average grain sizeASTM E381, Standard method of macroetch testing steel bars, billets, blooms, and forgings3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 19901-7:2013 and the following apply.ISO and IEC maintain
28、terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp3.1mooring chaincomponent used for positioning and mooring of offshore structures
29、composed of chain links (3.2) and accessories (3.3)3.2chain linkclosed, link shaped components of mooring chain (3.1), including common stud link, common studless link, enlarged link and end link3.3accessorydetachable connectors used for joining different chain components, including joining shackle(
30、3.8) and end shackle(3.9)3.4common stud linkcommon mooring chain link (3.2) with stud3.5common studless linkcommon mooring chain link (3.2) without stud ISO 2017 All rights reserved 1BS ISO 20438:2017ISO 20438:2017(E)3.6enlarged linkstrengthened link that connects a common link and the end link (3.7
31、)3.7end linklink that joins mooring chains (3.1) and shackles3.8joining shackleaccessories used for joining chain links (3.2) or other accessories, including “D” type LTM joining shackle, “D” type LTM end joining shackle, Kenter type joining shackle and “H” type LTM joining shackle3.9end shackleacce
32、ssories used for attaching the mooring chain (3.1) to mooring equipmentNote 1 to entry: It usually refers to LTM end shackle.3.10LTM shacklelong term moored “D” type joining shackle, “D” type end joining shackle and end shackle with the bolt fastened by nut3.11nominal diameterdiameter of the common
33、link4 Grade4.1 The mooring chain is classified by tensile strength into five grades: R3, R3S, R4, R4S and R5.4.2 The mechanical properties of mooring chain for each grade are given in Table 1.4.3 The proof load and breaking load of mooring chains for each grade are given in Table 2.5 Materials5.1 Th
34、e steel used for manufacturing of mooring chains is classified into five grades: R3, R3S, R4, R4S and R5.5.2 Mechanical properties for materials of each grade shall meet the requirements of base materials specified in Table 1.5.3 The steel shall be manufactured by an electric progress or one of the
35、basic oxygen processes or any other process involving secondary refining. The austenite grain size shall be 6 or finer in accordance with ASTM E112.5.4 Steel grades R4S and R5 shall be vacuum degassed.5.5 For steel grades R4S and R5, the following test results shall be supplied by steel mills to the
36、 mooring chain or accessory manufacturer:a) Each heat shall be examined for non-metallic inclusions according to ISO 4967 or equivalent standards.2 ISO 2017 All rights reservedBS ISO 20438:2017ISO 20438:2017(E)3.6enlarged linkstrengthened link that connects a common link and the end link (3.7)3.7end
37、 linklink that joins mooring chains (3.1) and shackles3.8joining shackleaccessories used for joining chain links (3.2) or other accessories, including “D” type LTM joining shackle, “D” type LTM end joining shackle, Kenter type joining shackle and “H” type LTM joining shackle3.9end shackleaccessories
38、 used for attaching the mooring chain (3.1) to mooring equipmentNote 1 to entry: It usually refers to LTM end shackle.3.10LTM shacklelong term moored “D” type joining shackle, “D” type end joining shackle and end shackle with the bolt fastened by nut3.11nominal diameterdiameter of the common link4 G
39、rade4.1 The mooring chain is classified by tensile strength into five grades: R3, R3S, R4, R4S and R5.4.2 The mechanical properties of mooring chain for each grade are given in Table 1.4.3 The proof load and breaking load of mooring chains for each grade are given in Table 2.5 Materials5.1 The steel
40、 used for manufacturing of mooring chains is classified into five grades: R3, R3S, R4, R4S and R5.5.2 Mechanical properties for materials of each grade shall meet the requirements of base materials specified in Table 1.5.3 The steel shall be manufactured by an electric progress or one of the basic o
41、xygen processes or any other process involving secondary refining. The austenite grain size shall be 6 or finer in accordance with ASTM E112.5.4 Steel grades R4S and R5 shall be vacuum degassed.5.5 For steel grades R4S and R5, the following test results shall be supplied by steel mills to the moorin
42、g chain or accessory manufacturer:a) Each heat shall be examined for non-metallic inclusions according to ISO 4967 or equivalent standards.2 ISO 2017 All rights reserved ISO 20438:2017(E)b) A sample from each heat shall be macro etched according to ASTM E381 or equivalent standards to ensure there i
43、s no injurious segregation or porosity.c) Jominy hardenability data according to ASTM A255 or equivalent standards shall be supplied with each heat.5.6 Steel grades R4, R4S and R5 shall contain a minimum of 0,20 % molybdenum.6 Shape, dimensions and tolerances6.1 The shapes of common studless link, c
44、ommon stud link, enlarged studless link, enlarged stud link and end link are indicated in Figures 1 to 5 and their dimensions are specified in Tables 3 to 7.6.2 The shapes of kenter shackle, “H” type LTM joining shackle (sample), “D” type LTM end joining shackle (sample), “D” type LTM joining shackl
45、e, LTM end shackle are indicated in Figures 6 to 10 and their dimensions are specified in Tables 8 to 12.6.3 Tolerances of common links, enlarged links and end linksThe diameter shall be measured at crown, and the average value based on two perpendicular measurements must have no negative tolerance
46、and the plus tolerance shall not exceed 5 % of nominal diameter. The minus tolerance for the diameter measured at crown shall meet the following requirements: for nominal diameter from 50 mm to 84 mm: 2 mm; for nominal diameter from 85 mm to 122 mm: 3 mm; for nominal diameter from 123 mm to 152 mm:
47、4 mm; for nominal diameter from 153 mm to 184 mm: 6 mm; for nominal diameter from 185 mm to 210 mm: 7,5 mm; for nominal diameter over 210 mm: 8,5 mm.The cross sectional area of the crown shall not be less than the theoretical cross section of the nominal diameter.The plus tolerance at weld shall not
48、 exceed 15 % of nominal chain diameter.6.4 Length of five linksThe five-link length of links shall be 5 p + 2 d = 22 d measured from outside. The allowable manufacturing tolerance on a length of five links is 025+ ,% .6.5 All other dimensionsThe tolerances of the diameter: 05+%.The tolerances other
49、than diameter: 2,5 %. ISO 2017 All rights reserved 3BS ISO 20438:2017ISO 20438:2017(E)Table 1 Mechanical properties of mooring chainGrade Minimum yield strengthN/mm2Minimum tensile strengthN/mm2Minimum elongation%Minimum reduction in area%Average impact energy JTemperatureCBase material WeldAverage Single valueAverage Single valueR3 410 690 17 500 60 45 50 3820 40 30 30 23R3S 490 770 15 500 65 49 53 4020 45 34 33 25R4 580 860 12 50 20 50 38 36 27R4S 700 960 12 50 20 56 42 40 30R5 760 1000 12 50 2
