1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 13799:2012Ships and marine technology Ships mooring and towingfittings Recessed bitts(Casting type)BS ISO 13799:2012 BRITISH STANDARDNational forewordThis British Standard
2、 is the UK implementation of ISO 13799:2012.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 publica
3、tion does 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 69757 9ICS 47.020.50Compliance with a British Standard cannot confer immunity fro
4、mlegal obligations.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 13799:2012 ISO 2012Ships and marine technology Ships mooring and towing fittings Recessed bitts (Ca
5、sting type)Navires et technologie maritime Corps-morts et ferrures de remorquage de navires Bittes damarrage encastres (type moulage)INTERNATIONAL STANDARDISO13799First edition2012-07-01Reference numberISO 13799:2012(E)BS ISO 13799:2012ISO 13799:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTEC
6、TED DOCUMENT ISO 2012All rights reserved. Unless 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 memb
7、er body in the country of the requester.ISO 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 13799:2012ISO 13799:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroductio
8、n v1 Scope 12 Normative references . 13 Terms and definitions . 14 Classification 14.1 Type . 14.2 Nominal sizes . 15 Dimensions . 16 Materials . 27 Construction . 28 Manufacturing and inspection . 29 Marking . 2Annex A (informative) Basis for strength assessment of recessed bitts (Casting type) 5Bi
9、bliography . 7BS ISO 13799:2012ISO 13799:2012(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 me
10、mber body interested in a subject for which 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 E
11、lectrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards 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 adop
12、ted by the technical committees are circulated to the member bodies for voting. Publication as an International 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 paten
13、t rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 13799 was 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 13799:2012ISO 13799:2012(E)Introductio
14、nThe recessed bitt is a type of ships towing fitting installed on the side shell of the ship.The recessed bitts are normally provided to easily attach the towing lines where the height of the mooring deck is too high. ISO 2012 All rights reserved vBS ISO 13799:2012BS ISO 13799:2012Ships and marine t
15、echnology Ships mooring and towing fittings Recessed bitts (Casting type)1 ScopeThis International Standard specifies the design, size and technical requirements for casting type recessed bitts to meet normal towing requirements.2 Normative referencesThe following referenced documents are indispensa
16、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.IMO Circular MSC/Circ.1175, Guidance on shipboard towing and mooring equipment3 Terms and definitio
17、nsFor the purposes of this document, the following terms and definitions apply.3.1safe working loadSWLmaximum load in kN on the rope that should normally be applied in service conditions.4 Classification4.1 TypeDepending on the size and strength of the material, recessed bitts shall be classified as
18、 the following six types: Type 75 nominal size 850, casting material having a yield point of not less than 235 N/mm2 Type 110 nominal size 850, casting material having a yield point of not less than 350 N/mm2 Type 135 nominal size 850, casting material having a yield point of not less than 430 N/mm2
19、 Type 100 nominal size 920, casting material having a yield point of not less than 235 N/mm2 Type 150 nominal size 920, casting material having a yield point of not less than 350 N/mm2 Type 180 nominal size 920, casting material having a yield point of not less than 430 N/mm24.2 Nominal sizesThe nom
20、inal sizes of recessed bitts are denoted by reference to the outside diameter of the bitt, in millimetres.The nominal size is: 850 and 920.5 DimensionsRecessed bitts have dimensions and particulars in accordance with Table 1 and Figure 1.INTERNATIONAL STANDARD ISO 13799:2012(E) ISO 2012 All rights r
21、eserved 1BS ISO 13799:2012ISO 13799:2012(E)6 MaterialsThe materials of the following components shall be used for manufacturing the recessed bitts: Type 75 and type 100: weldable steel casting having a yield point of not less than 235 N/mm2. Type 110 and type 150: weldable steel casting having a yie
22、ld point of not less than 350 N/mm2. Type 135 and type 180: weldable steel casting having a yield point of not less than 430 N/mm2.7 Construction7.1 The welding connections to the hull shall be guaranteed reliable transmission of the maximum loading of the recessed bitts to hull construction without
23、 any plastic deformation or cracks.7.2 The hull construction which the recessed bitts are installed on shall be reinforced by carlings, stiffeners, etc.7.3 The recessed bitts shall be considered as a part of the hull side shell construction.8 Manufacturing and inspection8.1 All surfaces of the reces
24、sed bitts, including welding, shall be free from any visible flaws or imperfections.8.2 All surfaces in contact with the ropes shall be free from surface roughness or irregularities likely to cause damage to the ropes by abrasion.8.3 The recessed bitts shall be coated externally with an anti-corrosi
25、on protective finish.9 Marking9.1 The safe working load (SWL) for the intended use for the recessed bitts shall be noted in the towing and mooring plan available on board for the guidance of the shipmaster as specified in MSC/Circ.1175.9.2 The actual SWL on board shall be determined by considering t
26、he reinforcement around the recessed bitts, and it shall be marked on the towing and mooring plan. The actual SWL shall not be over the SWL indicated in this International Standard.9.3 The recessed bitts shall be clearly marked with their SWL by weld bead or equivalent. The SWL shall be expressed in
27、 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 13799:2012ISO 13799:2012(E)Dimensions in millimetresaSWL marking.bSide shell.NOTE 1 Bitt welding method to hull connection is to be approved by Classifica
28、tion Society.NOTE 2 Centre marking by punching for easy installation.Figure 1 Recessed bitts ISO 2012 All rights reserved 3BS ISO 13799:2012ISO 13799:2012(E)Table 1 Dimensions and SWL of recessed bittsDimensions in millimetresNominal sizeDnD1d1b1b2R1R2R3R4R5R6R7R8850 850 750 200 280 450 500 250 65 1
29、15 50 55 250920 920 812 216 300 490 544 270 70 124 55 60 270Nominal sizeDnR9R10t1f1f2f3f4f5h1h2h3850 180 30 50 500 250 180 248,7 263,4 400 190 110920 195 30 54 544 270 195 274,3 290,4 430 205 110Nominal sizeDnTypeMaterial(minimum yield strength)SWLCalculated weight(kg)(kN) (t)850Type 75 235 N/mm2736
30、 75 770Type 110 350 N/mm21 079 110 770Type 135 430 N/mm21 324 135 770920Type 100 235 N/mm2981 100 826Type 150 350 N/mm21 472 150 826Type 180 430 N/mm21 766 180 826aThe SWL is the maximum applicable rope tension.The SWLs shown in this table are for reference only. These are based on the loadings as m
31、entioned in Annex A.bThe calculated weight is for reference only.4 ISO 2012 All rights reservedBS ISO 13799:2012ISO 13799:2012(E)Annex A (informative) Basis for strength assessment of recessed bitts (Casting type)A.1 GeneralThe strength of the recessed bitts was evaluated by finite element model ana
32、lysis and determined based on the following design criteria.A.2 LoadingA.2.1 The recessed bitts are to be designed to withstand the loads imposed by the towing ropes.A.2.2 The recessed bitts are to be designed to withstand the following load case.They are to be designed to withstand the combined loa
33、d produced by P imposed as below positions.KeyP towing forceFigure A.1 Combined loads by towing ropeA.3 Load and stress criterionUnder the SWL, the following stress criterion was adopted. The combined stress is limited to 85 % of the yield stress of the material. ISO 2012 All rights reserved 5BS ISO
34、 13799:2012ISO 13799:2012(E)A.4 Wear-down allowances and corrosion additionsA.4.1 Wear-down allowancesFor the strength calculation, wear-down of 2 mm is to be deducted from the gross thickness, where the rope is rubbing the surface.A.4.2 Corrosion additionsThe corrosion margin was already included i
35、n the safety factor and 2 mm wear-down allowance.6 ISO 2012 All rights reservedBS ISO 13799:2012ISO 13799:2012(E)Bibliography1 IACS UR A2, Shipboard fittings and supporting hull structures associated with towing and mooring on conventional vessels2 OCIMF, Mooring Equipment Guidelines (MEG3)3 ISO 499
36、0, Steel castings General technical delivery requirements4 ISO 9477, High strength cast steels for general engineering and structural purposes ISO 2012 All rights reserved 7BS ISO 13799:2012ISO 13799:2012(E) ISO 2012 All rights reservedICS 47.020.50Price based on 7 pagesThis page deliberately left b
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