BS ISO 13713:2020 pdf free.Ships and marine technology一Ship’s mooring and towing fittings – Mooring chocks.
BS ISO 13713 1 Scope This document specifies the types, nominal sizes, dimensions and materials, as well as construction, manufacturing and marking requirements, for mooring 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. IMO 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: ISO Online browsing platform: available at https://www.iso.org/obp 一IEC Electropedia: available at http://www.electropedia.org/A.1 General The strength of the mooring chocks was evaluated by finite element model analysis and determined based on the following design criteria. A.2 Loading The mooring chocks shall be designed to withstand the horizontal (Figure A.1) and vertical (Figures A.2 and A.3) load cases. The horizontal and vertical loadings were considered individually, but both loadings were not considered simultaneously.4.1 Type The mooring chocks shall be classified by its installation site as belonging to one of the following types:  a) Type A: deck- mounted mooring chock;  b) Type B: bulwark-mounted mooring chock. 4.2 Nominal sizes The nominal sizes, L x H, of mooring chocks are denoted by reference to the width and height of the opening of the chock, in millimetres. For the mooring chocks having the same size, the letter of the alphabet, i.e. A or B, is followed by the nominal size for the different safe working loads (SWL). The nominal sizes are: 250 x 200, 300 x 250, 350 x 250, 400x 250, 450 x 250, 500 x 250A, 500 x 250B NOTE The loads were considered for a rope deflected through the mooring chock, as shown in this figure.Vertical down side: outboard down 90°, inboard down 30°. Vertical up side: outboard up 30°, inboard up 15°.BS ISO 13713 pdf download.