Testing Cargo & Ballast Line

• Run the pump until it develops a steady pressure in the line. Normally it is about 12-13 bars for centrifugal pumps
• When the pressure is steady close the pump discharge valve and stops the pump
• Close all the valves on the suction side
• Open the pressure gauge on the manifold, which is located outboard after the manifold valve
• Connect the three-way valve of the hydraulic pump to the manifold
• As the valves are connected firmly, pressurize the hydraulic pump above the line pressure using the compression lever to avoid any backflow of water
167. l Marine Insight from the line
• Slowly open the manifold valve
• The line and the pressure gauge of the pump will now show a common pressure Cargo Operations for Tanker I 168. Hydraulic Pressure Pump

• The compression of the lever will be used to increase the pressure in the line
• Slowly raise the pressure of the system to the test levels and hold it therefor sometime As the pressure is maintained steadily in the line, take a good round throughout the line to inspect flange, joints, expansion joints, and valves for any leaks or structural failure
• If result is satisfactory, close the three-way valve on the pump and depressurize the hydraulic fluid by opening the relief valve slowly
• Open the tank valves of any tank and release the line pressure by opening the drop valves on the line
• Disconnect the pump assembly from the manifold. Slowly open the hydraulic pipe connection to ensure there is no pressure
• Fix back the pressure gauge firmly
169. l Marine Insight Cargo Operations for Tanker I 170. Checking Pipeline for Leakages During Pressure Testing

The strength of the cargo hold/tank boundaries are tested by the ship's staff under the supervision of the master. The testing is done either by using the cargo itself or by the ballast water. Strength Testing Using Cargo Oil To test the relevant boundary strength of the tank, the ship maybe loaded in a checkerboard pattern as shown in the figure. This is done to provide a full load to the internal bulkheads of the cargo tank. The ship's crew must create the required pressure testing condition as per the tank testing procedure stated in the SMS of the vessel.
171. l Marine Insight The head of pressure intended for loading of the tank should also be checked for stability condition by the master.

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