ISO 13795-2012 pdf free.Ships and marine technology – Ship’s mooring and towing fittings一Welded steel bollards for sea-going vessels.
ISO 13795 specifies the design, size and technical requirements for welded steel bollards suitable for installation on sea-going vessels to meet normal mooring and towing requirements.
2 Normative references
The following referenced documents are indispensable for the application 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 ternis and definitions apply.
safe working load SWL maximum load in kN on the rope that should normally be applied in service conditions
3.2 TOW maximum load on the rope applied to a bollard subjected to tug boat pull by using an eye splice at the end of the towing rope to connect to the bollard
4 Classification
4.1 Type
Depending on the construction, welded steel bollards shall be classified as the following two types:
— Type A — with compact base plate:
— Type B — with wide base plate.
4.2 Nominal sizes
The nominal sizes, D. of bollards are denoted by reference to the outside diameter of the post, in millimetres. in terms of the nearest number drawn from a basic series of preferred numbers, For the bollards having the same post diameter, the nominal size is followed by an alphabetical character for the different SWL.
The nominal sizes are: 150, 200, 250A, 250B, 300A, 300B, 350A. 350B, 400A, 400B, 450A, 450B, 500A, 500B, 550A. 550B and 600.
5 Dimensions
Bollards have dimensions and particulars in accordance with Tables 1 and 2, and Figures 1 and 2.
6 Materials
The materials of the following components shall be used for manufacturing the bollards:
— Plates: weldable steel plates having a yield point of not less than 235 N/mm2.
— Post tubes: weldable steel plates having a yield point of not less than 235 N/mm2 or equivalent steel tubes.
7 Construction
7.1 The posts of the bollards shall be constructed from steel tubes or formed from plate.
7.2 The fins shall be installed to keep the ropes as low as possible so as to reduce the loads to the bollard posts from the moonngltowing ropes.
7.3 The eye plate for tying the stopping-off rope or chain shall be provided.
8 Manufacturing and inspection
8.1 All surfaces of the bollards including welding shall be free from any visible flaws or imperfections.
8.2 All surfaces in contact with the ropes shall be free from surface roughness or irregularities likely to cause damage to the ropes by abrasion.
8.3 The bollards shall be coated externally with an anti-corrosion protective finish.
8.4 A low-friction surface coating is not recommended so as to increase the holding force of the mooring ropes under figure-of-eight belay.
9 Marking
9.1 The safe working load (SWL) intended for the use of the bollards shall be noted in the towing and mooring
plan available on board for the guidance of the shipmaster as specified in MSC/Circ,1175.
9.2 The actual SWL on board shall be determined by considering the under deck reinforcement, and it shall be marked
on the towing and moonng plan. The actual SWL shall not be over the SWI.. indicated in this International Standard.
9.3 The bollards shall be clearly marked with their SWL by weld bead or equivalent. The SWL shall be expressed in tonnes (letter t) and be placed so that it is not obscured during operation of the fitting.ISO 13795 pdf free download.
Tags: Ships and marine technology
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