STANDARD OPERATING INSTRUCTIONS NO, 2 MAINTENANCE AND OPERATION INSTRUCTIONS FOR POL FACILITIES PARRY ISLAND is piped to the gasoline transfer pump suction manifold, and to pumps P3 and P4 through valves V105 and V108 then discharged from the pumps to dehydrators 3 and 4 through check valves V104 and V107, valves V103, V106, V54 Strainer S2, Pressure Regulator valve V56, valve V57 and V58. Entrained water is sepa- rated at the dehydrators; then the gasoline leaves the dehydrators and goes through valves V59 and V60, Pilot operated motor valves V61 and V62, Deaerator No. 2, Meter M2, Pressure regulator valve V64, valve V66 and V68 to the tank truck loading rack, and also through valve V67 underground tank No. 10 at the gasoline filling station. At the loading rack, the gasoline passes through valve V109 and quick opening valve V110 to tank truck. During the unloading operation, valves V55 and V69 are closed and the required tank outlet valves, pump suction and discharge valves V54 are opened. After the truck has been loaded and the pumps cut off, valve V69 should be opened to relieve the pressure on the system back into the tanks. Valve V69 must always be closed when a truck is being loaded to prevent the pump from circulating the liquid back through the tanks, thus giving the wrong meter reading. 2-7