If I'm losing 30 psi every 20 seconds at a pump, how many gallons am I losing in that time frame? I don't really have a lot of information to go on, which is frustrating. I know the diameter of the pipe is 8" and there's a total length of 500 feet of the pipe. With this info I'm having trouble finding a good starting point on figuring this out. I do t know if it's being losses over a distance or just at a point. Can someone point me in the right direction? Feels like I'm missing something obvious.