A very important feature of the fueling trucks is the ability to relieve pressure while the pump is running and the fuel has no where to go. The primary pressure relief valve is set to relieve pressure at 40psi. If this valve fails a secondary pressure relief valve will kick open at 50psi. These valves have to be tested and adjusted. We use a calibrated pressure gauge on the fueling nozzle to ensure that the pump panel is accurate and the relief valve opens at the appropriate pressure. The pump panel gauge is allowed 3psi difference from the calibrated gauge. These pressure gauges on the panel get the readings from venturis located on the fueling pipes after the pump and can be adjusted to match the calibrated gauge. After the primary pressure relief passes a bypass valve is turned to test the secondary relief system. Kind of a neat process to test the trucks.
(Left) Calibrated gauge hooked up to the nozzle on the "recirc" port on the tank.
(Right) The nozzle is then closed to 95% position and 40psi is achieved as the primary releases. If the primary is <40 or >37 it must be adjusted.
(Far Left) Bypass valve(Above) Venturi with adjustable fitting so that gauge at panel can be calibrated.
Hours: 40
Total for Winter 2016 Quarter: 460
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