1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 13776:2012Ships and marine technology Ships mooring and towingfittings Pedestal fairleadsBS ISO 13776:2012 BRITISH STANDARDNational forewordThis British Standard is the UK
2、 implementation of ISO 13776:2012.The UK participation in its preparation was entrusted to TechnicalCommittee SME/32/-/4, Ships and marine technology - Outfitting anddeck machinery.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does
3、not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 69753 1ICS 47.020.50Compliance with a British Standard cannot confer immunity fromlegal obl
4、igations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2012.Amendments issued since publicationDate Text affectedBS ISO 13776:2012 ISO 2012Ships and marine technology Ships mooring and towing fittings Pedestal fairleadsNavires et
5、 technologie maritime Corps-morts et ferrures de remorquage de navires Chaumards pidestalINTERNATIONAL STANDARDISO13776First edition2012-07-01Reference numberISO 13776:2012(E)BS ISO 13776:2012ISO 13776:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Un
6、less otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester.ISO
7、copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 13776:2012ISO 13776:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope 12 Normative references . 13 Term
8、s and definitions . 14 Nominal sizes . 15 Dimensions . 16 Materials . 17 Manufacturing and inspection . 18 Marking . 2Annex A (informative) Basis for strength assessment of pedestal fairleads . 6Bibliography . 8BS ISO 13776:2012ISO 13776:2012(E)ForewordISO (the International Organization for Standar
9、dization) 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
10、 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 Stand
11、ards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.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 Inter
12、national 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 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 13776 was
13、 prepared by Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee SC 4, Outfitting and deck machinery.iv ISO 2012 All rights reservedBS ISO 13776:2012ISO 13776:2012(E)IntroductionThe pedestal fairlead is a type of ships mooring fitting installed on board to lead and change the dir
14、ection of mooring ropes. ISO 2012 All rights reserved vBS ISO 13776:2012BS ISO 13776:2012Ships and marine technology Ships mooring and towing fittings Pedestal fairleads1 ScopeThis International Standard specifies the design, size and technical requirements for pedestal fairleads installed to lead t
15、he mooring rope of a ship.2 Normative referencesThe 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.IS
16、O 13755, Ships and marine technology Ships mooring and towing fittings Steel rollersIMO Circular MSC/Circ.1175, Guidance on shipboard towing and mooring equipment3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1safe working loadSWLmaximum load in
17、 kN on the rope that should normally be applied in service conditions4 Nominal sizesThe nominal sizes, Dn, of pedestal fairleads are denoted by reference to the outside diameter of the roller in millimetres from a basic series of preferred numbers.The nominal sizes are: 150, 200, 250, 300, 350, 400,
18、 450 and 500.5 DimensionsPedestal fairleads have dimensions and particulars in accordance with Table 1, and Figures 1 and 2.6 MaterialsThe following material shall be used for manufacturing the pedestal fairleads: Pedestal: weldable steel plates having a yield point of not less than 235 N/mm2.7 Manu
19、facturing and inspection7.1 All surfaces of the pedestal fairleads, including welding, shall be free from any visible flaws or imperfections.7.2 All surfaces in contact with the ropes shall be free from surface roughness or irregularities likely to cause damage to the ropes by abrasion.INTERNATIONAL
20、 STANDARD ISO 13776:2012(E) ISO 2012 All rights reserved 1BS ISO 13776:2012ISO 13776:2012(E)7.3 The pedestal fairleads shall be coated externally with an anti-corrosion protective finish.8 Marking8.1 The safe working load (SWL) intended for the use of the pedestal fairleads shall be noted in the tow
21、ing and mooring plan available on board for the guidance of the shipmaster as specified in MSC/Circ.1175.8.2 The actual SWL on board shall be determined by considering the under deck reinforcement, and shall be marked on the towing and mooring plan. The actual SWL shall not be over the SWL indicated
22、 in this International Standard.8.3 The pedestal fairleads shall be clearly marked with their SWL by weld bead or equivalent. The SWL shall be expressed in tonnes (letter t) and be placed so that it is not obscured during operation of the fitting.EXAMPLE SWL XXX t2 ISO 2012 All rights reservedBS ISO
23、 13776:2012ISO 13776:2012(E)Dimensions in millimetresKey1 top plate2 body3 reinforcement4 rope guide5 steel roller (ISO 13755 steel rollers)aHeight is to be determined in accordance with actual mooring rope height through the pedestal fairlead.bDiameter D3is to be calculated depending on the height
24、of the pedestal , H D3= D2+ 2 (H- t1) x tan 10.cSWL marking.dSeam.Figure 1 Assembly of pedestal fairleads ISO 2012 All rights reserved 3BS ISO 13776:2012ISO 13776:2012(E)Dimensions in millimetresKey1 top plate2 body3 reinforcement4 rope guideaSWL marking.Figure 2 Detail of pedestal fairleads4 ISO 20
25、12 All rights reservedBS ISO 13776:2012ISO 13776:2012(E)Table 1 Dimensions and SWL of pedestal fairleadsDimensions in millimetresNominal sizeDnD1D2deh h1t1t2t3Welding leg lengthaType A and BType C z1z2150 220 230 71,5 81,5 200 100 16 10 16 8 5200 288 300 93,5 102,5 200 100 20 12 20 10 6250 357 370 1
26、13,5 119,5 200 100 22 12.5 22 11 6300 417 430 128,5 130,5 225 125 24 13 24 12 6,5350 472 490 145,5 152,5 225 125 26 17 26 15 8,5400 540 560 154,5 164,5 250 150 28 18 28 17 9450 600 620 167,5 179,5 250 150 30 20 30 20 10500 655 680 178,5 195,5 250 150 32 22 34 23 11Nominal sizeDnSWLcCalculated weight
27、d(kg)(for reference only) b= 90 = 0(kN) (t) (kN) (t) H = 500 H = 1 000 H = 1 500150 265 27 186 19 55 115 198200 441 45 314 32 86 169 278250 579 59 412 42 113 210 335300 726 74 510 52 145 256 395350 1 040 106 736 75 201 358 552400 1 246 127 883 90 255 436 657450 1 599 163 1 128 115 314 530 791500 1 9
28、42 198 1 373 140 383 636 938aWelding with chamfering is available based on the same welding volume/strength.b is the relative angle of ropes on the pedestal fairlead (refer to Annex A).cThe SWL is the maximum applicable rope tension based 90 ( = 90) and 180 ( = 0) deflection of rope direction by the
29、 pedestal fairlead.The SWLs shown in this table are for reference only. These are based on the loadings as mentioned in Annex A.The “SWL” may be adjusted depending on the actual loading conditions, and the actual marking shall be agreed between the user and the manufacturer.dThe calculated weight is
30、 for reference excluding the steel roller on the pedestal fairlead.ed shall be decided depending on the type of steel roller (Type A and B or Type C), as specified in ISO 13755. ISO 2012 All rights reserved 5BS ISO 13776:2012ISO 13776:2012(E)Annex A (informative) Basis for strength assessment of ped
31、estal fairleadsA.1 GeneralThe strength of the pedestal fairleads was evaluated by finite element model analysis and simple beam theory calculation, and determined based on the following design criteria.A.2 LoadingThe pedestal fairleads are to be designed to withstand the following load cases.KeyP mo
32、oring force and towing force at the conical part of the throat of the rolleraConical part of throat.NOTE 1 The loads were considered with rope deflected 180 through the pedestal fairlead as shown in this figure.NOTE 2 The loads can be increased in accordance with the deflecting angle of the rope sma
33、ller than 180.Figure A.1 Loading on pedestal fairleadsA.3 Load and stress criteriaUnder the SWL, the following stress criteria were adopted: The bending stress is limited to 85 % of the yield stress of the material. The shear stress is limited to 60 % of the yield stress of the material.6 ISO 2012 A
34、ll rights reservedBS ISO 13776:2012ISO 13776:2012(E)A.4 Wear-down allowances and corrosion additionsThe wear-down margin and corrosion margin were already included in the safety factor. ISO 2012 All rights reserved 7BS ISO 13776:2012ISO 13776:2012(E)Bibliography1 ISO 2408, Steel wire ropes for gener
35、al purposes Minimum requirements2 IACS UR A2, Shipboard fittings and supporting hull structures associated with towing and mooring on conventional vessels3 OCIMF, Mooring Equipment Guidelines (MEG3)8 ISO 2012 All rights reservedBS ISO 13776:2012BS ISO 13776:2012ISO 13776:2012(E) ISO 2012 All rights
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