Q.Explain correct bunker line pressure testing procedure ?

PROCEDURE TO BE FOLLOWED A-FILL IN THE BUNKER LINE WITH WATER B-- CLOSE ALL VALVES AND PRESSURIZE TO THE STATED MAX. ALLOWABLE WORKING PRESSURE AS STATED IN THE VESSEL DRAWINGS. AIR WILL NEED TO BE VENTED OUT TILL ONLY WATER IS COMING OUT FROM THE HIGHEST AND FURTHER MOST POINT IN THE SYSTEM. -AT THE COMPLETION OF REACHING THE PRESSURE CLOSE, THE VALVE AT “ A “. -MONITOR THE PRESSURE AT THE INSTALLED PRESSURE GAUGE AND ENSURE IT IS STEADY. -THE PRESSURE SHOULD MAINTAIN WITH 1 % DROP FOR ONE HOUR. -VISUALLY CHECK THE LINES FOR SIGNS OF ANY LEAKAGES. C. OPEN THE DRAIN LINE CONNECTED TO THE SLUDGE TANK ( A FLEXIBLE HOSE MAY BE CONNECTED FROM THIS LINE TO THE STANDARD DISCHARGE CONNECTION ). D. BLOW THE LINE FROM “D” TILL THE LINE IS CLEAR OF WATER. - SOME SECTION OF WATER WILL BE TRAPPED BETWEEN THE DEAD END PORTING BETWWEN THE MAIN PIPE AND INDIVIDUAL VALVES. - OPEN THE VALVES AND DRAIN THIS WATER INTO THE BUNKER TANK. - THIS IS NEGLIGIBLE AMOUNT OF WATER WHICH SHOULD BE DRAINED FROM THE SETTLING TANK AFTER TRANSFER. - WATCHKEEPERS TO ENSURE 4 HOURLY DRAINING FROM THE SETTLING AND SERVICE TANKS WHENEVER THE BUNKER LINE TESTING IS DONE.