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...