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Hi Latexman, thanks for your thoughts. There are 1" solenoid valves and 3" butterfly valves at this project (3" header, 1" branches to each day tank). There are only electric & manual actuators, no pnematics, and there is a back-up power supply. I appreciate that you've related your...

Hi Ted. I'm not sure that this would work well in this case - there are multiple tanks that require fuel and if one tank is off, but another is on, the line with the shut-off tank is going to be sending fluid back to the pump and basically recirculating the fluid.

Latexman, my understanding is that fuel is being routed from the relief valve into a drip pan rather than the suction side of the pump so the fuel would not make it back to the supply tank. Changing that would be an option, but my understanding is that an internal relief valve on a pump is only...

FYI, he = she :) The 50 psi developed in the pipe line is a coincidence. The fluid is trapped between the discharge side of a check valve and a solenoid valve, sorry if my description of the pump's pressure relief valve confused the issue. The pressure gauge on the line in question has a...

The issue I have is that the supply tank is outside and at a higher elevation than the pump, so to get the excess fluid back to the supply tank, the pipe would have to travel a couple hundred feet at an upward incline and be routed underground. An easier way to deal with the overflow might be...

Daniel, I agree that it may be beneficial to shut the pump off before the solenoid valve - we are currently looking into whether this can be done with the existing controls. I also agree that pressure increase is not caused by the downstream tank since the pipe discharges into the top of the...

The pipes are not exposed to direct sunlight, but they are located within a few feet of diesel generators which likely does add some heat to the pipes. I am starting to believe that maybe it is thermal expansion that's causing such a large pressure increase. I will recommend the temperature...

Hi everyone, I am wondering if anyone has had any experience with a piping system becoming overpressurized when the pump is shut off. Here is my scenario: Fluid: No. 2 diesel fuel Pump: 2 hp, 1800 rpm gear pump Flow: 30 gpm Design pressure: 30 psi There is a 12 ft negative suction lift at...