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Marine Chocks have multiple forms such as closed chock, open chock, no-roller chock, roller chock. It is mainly divided into two types: no roller chock and roller chock. Generally, marine chock is made by casting with integral and modular forms. Marine cast chocks are normally mounted on the gunwale of the bow and poop. Roller chock chock can reduce the friction to mooring rope.
Features of roller chock:
Model: CB/T 38-1999 Roller Chock.
Material: Cast steel.
Certificate: CCS, DNV, ABS, BV, LR, RS, KR.
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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