BS ISO 13755:2020 pdf free.Ships and marine technology一Ship’s mooring and towing fittings – Steel rollers.
BS ISO 13755 This document specifies the types, nominal sizes, dimensions and materials, as well as construction, manufacturing and marking requirements, for steel rollers installed to lead the mooring rope of a ship.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.IS0 13767 Ships and marine technology一Ship’s mooring and towing fttings一Shipside roller fairleads ISO 13776, Ships and marine technology – – Ship’s mooring and towing fittings一Pedestal fairleads IMO Circular MSC/Circ.1175, Guidance on shipboard towing and mooring equipment.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 ——IEC Electropedia: available at http://www.electropedia.org/ safe load limit (maximum permissible load) of the fittings used for mooring and towing.Depending on the construction, steel rollers shall be classified as belonging to one of the following three types:a) Type A: made of steel casting without upper dust cover;b) Type B: made of steel casting with upper dust cover;c) Type C: made of steel plate with dust cover.The nominal sizes, Dn, of steel rollers 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, 450 and 500.The steel rollers shall be clearly marked on their seat or foundation with their SWL by weld bead or equivalent. The SWL shall be expressed in tonnes (symbol ‘t’) and be placed so that it is not obscured during operation of the ftting.The strength of the steel rollers was evaluated by simple beam theory calculation and determined based on the following design criteria.BS ISO 13755 pdf download.