JIG FOR AIR VENT HEAD OF WATER BALLAST TANK AND METHOD FOR CLEANING USING THE SAME

Disclosed are an improved structure for an air vent head of a ballast tank and a cleaning method using the same which are provided to efficiently and finally clean the inside of a manufactured ballast tank before a ship is transferred to a ship owner after manufacturing of the ballast tank is completed. A jig for an air vent head of a ballast tank is mounted on the air vent head of the ballast tank to clean the inside of the ballast tank and comprises a jig body which covers and seals an upper entrance of the air vent head; and a nipple which is provided on the jig body and sprays air into the ballast tank. Meanwhile, the cleaning method using the jig for an air vent head performs a cleaning process comprising opening a covering member which covers the upper entrance of the air vent head of a ballast tank; combining the jig which includes the nipple at the upper entrance of the air vent head to be sealed; and supplying air through the nipple into the ballast tank. Accordingly, the method prevents pressure loss occurring during an air blowing process, can clean the inside of the ballast tank by enough pressure, selects and uses the jig of proper size and form using a structure of the air vent head, efficiently performs a cleaning work, and reduces working and inspecting hours.