STANDARD OPERATING INSTRUCTIONS NO. 2 MAINTENANCE AND OPERATION INSTRUCTIONS FOR POL FACILITIES PARRY ISLAND closed and valve V2 is opened allowing the diesel oil to pass into the unloading system. Valves V112, V113, V115, are closed during this operation. A line is connected across the main unloading header and the vent on tank No. 3 through the float chamber of Liquid Lever Control valve Ll which is used to actuate the valve. This lever control can be set to operate on an individual horizontal tank, all five tanks, or can be isolated from the system by means of block valves V46 and V47. DIESEL UNLOADING OPERATION 5. Diesel fuel oil is unloaded to the main unloading header from tanks Nos. 1 to 5 inclusive through valves Nos. V17, V18, V19, V20 and V21 from tanks Nos. 304 and 305 through valves V38, V42 and V4O and from tanks Nos. 153 to 158 inclusive through valves Nos. V35 and V36. The oil then passes to the diesel transfer pump suction manifold and to pumps Pl and P2 through valves V48 and V51 and is discharged from the pumps to dehydrators No. 1 and 2 through check valves V50, V52, valves V51, V53, V115, Strainer S-1, Pressure Regulator Valve V3 and Valves V4 and V5. Engrained water is separated at the dehydra- tor, and the diesel oil then leaves the dehydrators through valves V8 and V9, and pilot operated motor valves V6 and V7, deaerator No. 1, meter M-1, Pressure Regulator valve V1l,