# Basic water pressure formula

by metroactus
Tags: basic, formula, pressure, water
 P: 2 ive scanned about 200 closely relevant posts to make sure im not one of those "here we go again" posts, but can find no basic water pressure formula. Specifically I need to calculate variable hypothetical water pressures (with a final conversion to GAUGE pressure) with a known INLET PSI, comparing pipe size, pipe configuration, change in elevation, etc. Short of a hundred bucks for an engineering book, i cant find this exact formula though a lot are close. I have my constants for friction loss, gravity, inlet psi, angled and reduced pipe fittings, but need the equation that ties all these together to constantly reference as i mix and match to achieve the highest psi possible, or at the least, economically feasible. thanks in advance to accurate replys
P: 2,284
 Quote by metroactus ive scanned about 200 closely relevant posts to make sure im not one of those "here we go again" posts, but can find no basic water pressure formula. Specifically I need to calculate variable hypothetical water pressures (with a final conversion to GAUGE pressure) with a known INLET PSI, comparing pipe size, pipe configuration, change in elevation, etc. Short of a hundred bucks for an engineering book, i cant find this exact formula though a lot are close. I have my constants for friction loss, gravity, inlet psi, angled and reduced pipe fittings, but need the equation that ties all these together to constantly reference as i mix and match to achieve the highest psi possible, or at the least, economically feasible. thanks in advance to accurate replys
Here are some formulas complements of Q_Goest a few posts below...

CS
Attached Files
 Pipe-Flo Pro.pdf (105.0 KB, 143 views)
 Sci Advisor HW Helper PF Gold P: 2,908 Hey, that looks familiar! lol
 Sci Advisor P: 5,095 Basic water pressure formula I have a link to your post Q. It comes in handy quite often.
 P: 1 To pumping crude oil (0.9 SG) with distance for 72 km on 8" steel pipe with flow rate as 725GPM and my question is how much the pressure (psi) to do this work ? Please help ?