PSI can’t be directly converted to GPM; these are two different units of measure. PSI measures pressure and GPM measures flow rate. But if other variables are known, the water’s flow rate in GPM can be calculated with the help of the Bernoulli equation for incompressible fluid and careful unit conversion.Click to see full answer. Hereof, does PSI affect GPM?Obviously 30 GPM will empty the same tank faster than 15 gpm. PSI (or PSIG to be more correct since we are measuring pressure above atmospheric and not absolute) which means pounds per square inch gauge, would have more effect on spray distance given the same flow rate.Secondly, how do I calculate GPM? The formula to find GPM is 60 divided by the seconds it takes to fill a one gallon container (60 / seconds = GPM). Example: The one gallon container fills in 5 seconds. 60 / 5 = 12 GPM. (60 divided by 5 equals 12 gallons per minute.) Similarly, how many GPM is 60 psi? 2.2 GPM How do you calculate psi from flow rate?to get this, divide the total pressure drop by the pipe length and multiply by 100. in this case, it is 10 divided by 200 times 100, which equals 5 psi. to get the flow, multiply 3.0877 by 5 raised to the power of .5415, which equals 7.38. the flow is 7.38 gpm.
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