BS ISO 13729:2020 pdf free.Ships and marine technology一Ship’s mooring and towing fittings一Closed chocks.
BS ISO 13729 1 Scope This document specifies the types, nominal sizes, dimensions and materials, as well as construction, manufacturing and marking requirements, for closed chocks installed to lead the mooring and towing rope of a ship.2 Normative references The 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. For undated references, the latest edition of the referenced document (including any amendments) applies.IM0 Circular MSC/Circ.1175, Guidance on shipboard towing and mooring equipment.3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: 一IS0 Online browsing platform: available at hts:///wisw.org/opo 一IEC Electropedia: available at http://www.electropedia.org/ 3.1 safe working load SWL safe load limit (maximum permissible load) of the fittings used for mooring and towing 4 Classification 4.1 Type The closed chock shall be classified by its installation site as belonging to one of the following types: a) Type A: deck mounted closed chock; b) Type B: bulwark mounted closed chock.4.2 Nominal sizes The nominal sizes,Lx H x D, of closed chocks are denoted by reference to the width and height of the opening and the depth of the chock, in millimetres. For the closed chocks having the same size, the letter of the alphabet, i.e. A or B, is followed by the nominal size for the different SWL. The nominal sizes are: 250x200x214,300x250x286,350x250x333,400x250x381,450x250x381,500x250x381, 400x 250x 428, 450x 250 x 428, 500x 250 x 428, 500x 400 x 428, 500 x 250 x 525A, 500x 400 x
525A, 500 x 250 x 525B, 500 x 400 x 525B A.1 General The strength of the closed chocks was evaluated by finite element model analysis and determined based on the following design criteria. A.2  Loading The closed chocks shall be designed to withstand the horizontal and vertical load cases. The horizontal and vertical loadings were considered individually, but both loadings were not considered simultaneously.BS ISO 13729 pdf download.