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...