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2 — Guidance on a method of calculation of the effect of water on deck Internationaal Verdrag van Torremolinos voor de beveiliging van vissersvaartuigen, 1977

Guidance on a method of calculation of the effect of water on deck

(1) The ability of the vessel to withstand the heeling effect due to the presence of water on deck should be demonstrated by a quasi-static method, with reference to Figure 2, when the following condition is satisfied with the vessel in the worst operating condition:

Ratio Cwod = area “b”/area “a” should not be less than unity.

(2) The angle which limits area “b” should be equal to the flooding angle Өf or 40 degrees whichever is the less.

(3) The value of the heeling moment Mwod (or the corresponding heeling arm) due to the presence of water on deck should be determined assuming that the deck well is filled to the top of the bulwark at its lowest point and the vessel heeled up to the angle at which this point is immersed. For the determination of Mwod the following formula should be used:

Mwod= K Mw

where

Mw = static heeling moment due to water on deck

K = coefficient.

(a) If Mwod is determined by a static approach K = 1.0 may be applied.

(b) If Mwod is detemined by a quasi-static approach, K may take into account the rolling period of the vessel and the dynamic effect of the water flow, including the effect of the disposition and configuration of deck wells and deckhouses. The value of K schould be satisfactory, taking into account the type of vessel, area of operation, etc. For vessels where the angle of deck edge immersion ӨD is less than 10 degrees to 15 degrees, or the angle of bulwark top immersion ӨB is less than 20 degrees to 25 degrees a value for K greater than 1.0 may be applied. When ӨD is greater than 20 degrees or ӨB greater than 30 degrees a value for K less than 1.0 may be applied.

(4) When calculating Mw the following assumptions should be made:

(a) at the beginning the vessel is in the upright condition;

(b) during heeling, trim and displacement are constant and equal to the values for the vessel without the water on deck;

(c) the effect of freeing ports should be ignored.

(5) The above provisions may be adjusted, taking into account the seasonal weather conditions and sea states in the areas in which the vessel will operate, the type of vessel and its mode of operation.

(6) Other methods for the calculation of the effect of water on deck using the dynamic approach may be adopted.

Regeling
Internationaal Verdrag van Torremolinos voor de beveiliging van vissersvaartuigen, 1977
Soort
Verdrag
Geldend vanaf
02-04-1977
BWB-id
BWBV0003251
Versie
1977-04-02_0

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