BS ISO 13767:2020 Ships and marine technology — Ship’s mooring and towing fittings — Shipside roller fairleads.
1 Scope
This document specifies the types, nominal sizes, dimensions and materials, as well as construction,manufacturing and marking requirements, for shipside roller fairleads installed to lead the mooring
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.
ISO 13755, Ships and marine technology — Ship’s mooring and towing fittings — Steel rollers 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
— 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
Depending on the construction, roller fairleads shall be classified as belonging to one of the following two types:
a) 2-roller type;
b) 3-roller type.
4.2 Nominal sizes
The nominal sizes, D n , of roller fairleads 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.
5 Dimensions
Roller fairleads shall have dimensions and particulars in accordance with Tables 1 and 2, and
Figures 1 and 2.
6 Materials
The following material shall be used for manufacturing the roller fairleads:
— seat: weldable steel plates having a yield point of not less than 235 N/mm 2 .
7 Manufacturing and inspection
7.1 All surfaces of the roller fairleads, including welded surfaces, shall be free from any visible flaws or imperfections.
7.2 All surfaces in contact with the ropes shall be free from surface roughness or irregularities likely to cause damage to the ropes by abrasion.
7.3 The roller fairleads shall be coated externally with an anti-corrosion protective finish.
8 Marking
8.1 The safe working load (SWL) for the intended use of the roller fairleads shall be noted in the towing and mooring plan available on board for the guidance of the shipmaster as specified in IMO circular MSC/ Circ.1175.
8.2 The actual SWL on board shall be determined by considering the under deck reinforcement, and it shall be marked on the towing and mooring plan. The actual SWL shall not be over the SWL indicated in this document.
8.3 The shipside roller fairleads shall be clearly marked with its 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 fitting.BS ISO 13767 pdf download.