RULES DET NORSKE VERITAS (DNV) = STRUCTURES = - Boat Design Net

Amended July 2011, see page 3 Rules for High Speed, Light Craft and Naval Surface Craft, January 2011Pt.3 Ch.3 Sec.3 – Page 21E. TestingE 100 Tanks101 Protective coating systems may be applied before water testing.All pipe connections to tanks are to be fitted before testing. If engine bed plates are bolted directly on the innerbottom plating, the testing of the double bottom tank is to be carried out with the engine installed.102 Unless otherwise agreed, all tanks are to be tested with a water head equal to the maximum pressure towhich the compartment may be exposed. The water is in no case to be less than to the top of the air pipe or toa level h 0 above the top of the tank except where partial filling alone is prescribed.h 0 = 0.03 L - 0.5 (m), minimum 1, generally= pressure valve opening pressure when exceeding the general value.E 200 Closing appliances201 Inner and outer doors below the waterline are to be hydraulically tested.202 Weathertight and watertight closing appliances not subjected to pressure testing are to be hose tested.The nozzle inside diameter is to be 12.5 mm and the pressure at least 250 kN/m 2 . The nozzle should be held ata distance of maximum 1.5 m from the item during the test.Alternative methods of tightness testing may be considered.203 All weathertight or watertight doors and hatches are to be function tested.DET NORSKE VERITAS AS