Investigations on Deck Wetness of Hatch Covers

In order to improve the hatch covers of a container ship, the calculations on deck wetness are applied to predict the water leakage into a cargo hold.The results obtained by the calculations are as follows : 1) The quantity of water flow into a cargo hold under the heavy weather is small, even where the gaskets of a hatch cover are eliminated.2) The short term probability of deck wetness is small.The flow into the foward cargo hold is less than 10 m3/h, under the sea conditions of significant wave height of 710 m.3) The long term probability of deck wetness is also not so high.According to these results, the improvement of hatch covers, such as elimination of gaskets, will be successfully adopted.