VT-21-250 PSI VERTICAL STORAGE TANKS - Taylor-Wharton

NOTE:The tank must contain liquid for setting control valves. The ECONOMIZERREGULATOR (PCV-2) must be adjusted while product is being withdrawnthrough the product withdrawal line.SETTING PRESSURE BUILDING REGULATOR (PCV-1):1. If tank pressure is below desired setting: Loosen pressure screw locknut on REGULATOR(PCV-1). With PRESSURE BUILDING ISOLATION VALVE (HCV-3) and PRESSUREBUILDING ISOLATION VALVE (HCV-11) open, gradually open REGULATOR (PCV-1)by turning pressure screw in (clockwise) to build tank pressure to 5 psig (0.34 bar / 34 kPa)above the desired delivery pressure. Note that the pressure screw must be adjusted in smallincrements, allowing sufficient time for tank pressure to stabilize each time the screw isturned. When desired set point is reached, tighten pressure screw locknut.2. If tank pressure is above desired setting: Loosen pressure screw locknut and turn pressurescrew out (counterclockwise) to end of adjustment range. Open TANK BLOWDOWNVALVE (HCV-12) and vent until tank pressure is 5 psig (0.34 bar / 34 kPa) above desireddelivery pressure. With PRESSURE BUILDING ISOLATION VALVE (HCV-3) andPRESSURE BUILDING ISOLATION VALVE (HCV-11) open, slowly turn pressure screwin (clockwise) until REGULATOR (PCV-1) just opens as indicated by cooling ofdownstream pipe (at REGULATOR outlet). Tighten pressure screw locknut.SETTING ECONOMIZER BACK PRESSURE REGULATOR (PCV-2):1. Loosen ECONOMIZER BACK PRESSURE REGULATOR (PCV-2) pressure screwlocknut and turn pressure screw in (clockwise) to end of adjustment range. Check that thePRESSURE BUILDING ISOLATION VALVES (HCV-3) and (HCV-11) are open.2. a. If tank pressure is below desired set point: Build pressure by opening both fillvalves. Note that the fill connection must be securely blanked off. As tank pressureincreases to desired set point-- at least 10 psig (0.7 bar / 70 kPa) above setting ofPRESSURE BUILDING REGULATOR (PCV-1) close BOTTOM FILL VALVE(HCV-1). When liquid in line vaporizes, close the TOP FILL VALVE (HCV-2).Relieve any residual pressure by momentarily opening HOSE DRAIN VALVE(HCV-7).b. If tank pressure is above desired set point: Open TANK BLOWDOWN VALVE(HCV-12) and vent until tank pressure is at desired set point -- at least 10 psi (0.7 bar/ 70 kPa) above setting of PRESSURE BUILDING REGULATOR (PCV-1).24