You cannot directly convert PSI to GPM. They are two different units of measure. PSI measures pressure, and GPM measures flow rate. However, if other variables are known, you can use Bernoulli's equation to indirectly make a conversion. The following assumes the flow is in a pipe and the pipe diameter is known. It also assumes a steady state incompressible flow.
Know MoreEnsure all units to be used agree with each other. This means ensuring there are no variables given in metric and that everything is measured in inches, not feet.
Use this equation, (g*h + (P/rho) + (V^2/2)) = constant, to solve for velocity. Upon isolating velocity, the equation will look like this: V = sqrt(2 * ((-P/rho) - g * h)) where P is the pressure, rho is the density of the fluid, g is gravity and h is the elevation above the reference plane.
Using the equation Q = V * A, calculate the velocity. Q is the volumetric flow rate, V is the velocity of the fluid and A is the cross-sectional area of the pipe.
One inch of water, as measured using a pressure gauge at four degrees Celsius, is equivalent to 0.036127291827 pounds per square inch (PSI). This conversion can be found at OnlineConversion.com.
Full Answer >SCFM is an acronym for standard cubic feet per minute. It is the volumetric flow rate of a gas corrected to standardized conditions of temperature and pressure, which makes it equivalent to the mass flow rate of the gas.
Full Answer >The term "absolute pressure" refers to the sum of the atmospheric pressure and gage pressure, expressed in the equation P_{absolute} = P_{gage} + P_{atm}. Absolute pressure is typically measured against a pure vacuum.
Full Answer >Full vacuum pressure occurs when pounds per square inch, or PSI, reaches zero. PSI is the most common standard to measure pressure. Nonetheless, other measurements also reach zero when a full or absolute vacuum is achieved.
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