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Roller fairlead is usually located in the sides of a ship which consists of a number of rollers. It is used to guide ropes of marine ships. Roller fairlead can be divided into open type and closed type roller fairlead. JIS F 2014-1987 roller fairlead has the following types: open type fairleads with two rollers, closed type fairleads with two rollers or three rollers. Each type is composed of rollers and a stand.
Features:
Type: Closed or open type roller fairlead.
Material: Cast steel, cast iron.
Standard: CB*58-83, JIS F 2014-1987
Roller No. : 2 or 3 rollers.
Nominal Diameter: 150mm to 450mm.
Certificate: CCS, ABS, BV, LR, NK, RINA.
Ship Proportions
L/B
The ratio of the length and breadth can differ quite dramatically depending on the type of vessel. Common values:
Passenger Ships |
6-8 |
Freighters |
5-7 |
Tug Boats |
3-5 |
A larger L/B value is favorable for speed, but unfavorable for manoeuvrability.
L/D
The length/depth-ratio. The customary values for L/D varies between 10 and 15. This relation plays a role in the determination of the freeboard and the longitudinal strength.
B/T (T=Draught)
The breadth/draught -ratio, varies between 2.3-4.5. A larger breadth in relation to the draught (a larger B/T value) gives a greater initial stability.
B/D
The breadth / depth ratio, varies between 1.3 and 2. If this value becomes larger, it will have an unfavorable effect on the stability (because the deck will be flooded when the vessel has an inclination) and on the strength.
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