How Do You Convert PSI Water Pressure to Gallons Per Minute?

PSI and GPM cannot be converted in one step. Both of them are distinct units of measurement. GPM measures flow rate, while PSI measures pressure. However, Bernoulli’s equation can be used to infer a conversion indirectly if other variables are known.

The ensuing is predicated on the notion that the flow is occurring in a conduit whose diameter is known. Additionally, an incompressible steady state flow is assumed.

Make sure all units concur

Make that the various units are compatible with one another. This entails making sure there are no metric variables provided and that all measurements are made in inches rather than feet.

Calculate fluid velocity using Bernoulli’s equation.

To calculate velocity, use the equation (g*h + (P/rho) + (V2/2)) = constant. The equation after excluding velocity will appear to be as follows: Where P is the pressure, rho is the fluid’s density, g is gravity, and h is the elevation above the reference plane, V is defined as sqrt(2 * ((-P/rho) – g * h)).

Calculate the flow rate.

Determine the velocity using the formula Q = V * A. Q stands for volumetric flow rate, V for fluid velocity, and A for pipe cross-sectional area.

Misha Khatri
Misha Khatri is an emeritus professor in the University of Notre Dame's Department of Chemistry and Biochemistry. He graduated from Northern Illinois University with a BSc in Chemistry and Mathematics and a PhD in Physical Analytical Chemistry from the University of Utah.


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