POL FACILITIES PARRY AND ENIWETOK RECOMMENDATIONS FOR BETTER OPERATION AND SAFER OPERATING CONDITIONS from valves V6 and V7, and valves V59 and V60 down stream from V61 and V62 it would be possible to make repairs with only one unit at a time shut down. See FS 638. Liguid Level Control. The liquid level control between the horizontal tanks is connected across the unloading header and a vent on one of the tanks thus making it necessary to leave all the tank outlet valves open in order to control the liquid, level. A separate manifold should be installed for this liquid level control system. See FS 608, ll. Some of the tank ships are equipped with hydraulic or positive ¢isplacement pumps which build up excessive pressures when the liquid level control cuts off liquid flow or when flow to tanks is changed. Pressure relief valves should be installed up stream from the pressure reducing valves V3 and V56 to bleed off or reduce this excess pressure. A tank should be provided at each relief valve to save the liquid and a means of returning the fluid to the system installed, See FS 639, 12, A parts list should be made up covering all equipment. 13. Valve identification tags should be provided and installed. See FS 604. i. A print of FS 497 should be displayed in the POL Pump House.