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Valve Plugging and Unplugging
Overboard discharge pipes of a vessel contains valves which are required to be checked periodically of its performance. Hence the plugging of the overboard and subsequent unplugging using wooden valves are required and for this purpose Divers are required.
WSS divers will proceed underwater to the overboard discharge pipe locations and plug in wooden plugs which will block sea water going in to the vessel. Thereafter the valve from inside the ship is taken out cleaned by the crew known as skinning the valve. A surveyor will then check the valves for leaks if any. Once this is done valves are put back to close position. Divers will then unplug the wooden plug from the discharge pipe; the surveyor will recheck the valve from the inside for any leaks.