![]() However, we can use Bernoulli's equation for an incompressible fluid to calculate the flow rate in GPM if certain other variables are known.īefore going further, let us first try to understand what Bernoulli's equation is. Since PSI is a measure of pressure and GPM is a measure of flow rate, we can not directly convert one into another. ![]() One US gallon per minute is approximately equal to 6.309 × 1 0 − 5 m 3 / s 6.309 × 10^ 6.309 × 1 0 − 5 m 3 /s. GPM or gallons per minute is a unit of flow rate, i.e., it specifies how fast a liquid (for example, water) moves through a pipe or pump. It is very commonly used in measuring pressure in industries and everyday life, for example, tire pressure, fire hydrant pressure, etc. One psi is approximately equal to 6894.76 pascals (the SI unit of pressure is pascal or Pa). In the UK we measure water pressure in bars, but in America they more commonly. Thus, a more accurate term for psi would be pound-force per square inch ( lbf/in 2). PSI stands for Pounds per Square Inch and is a unit of pressure measurement. A torr is defined as 1/760 of an atmosphere and can also be thought of as 1 mm-Hg, where 760 mm-Hg equals 29.92 in.-Hg. Any fraction of an atmosphere is a partial vacuum and equates with negative gauge pressure. In this sense, one uses the units PSIA to represent absolute pressure and PSIG to represent gauge. If you attach pressure gauge at the base of a pipe 100 feet tall pipe. Each of your fixtures, appliances and pipes are manufactured to handle a certain level of water pressure, usually from 60-80 psi (pounds per square inch). ![]() We can define 1 psi as the pressure due to a force of one pound-force applied on an area of one square inch. One standard atmosphere equals 14.7 psi (29.92 in.-Hg). In the imperial system, these measurements are quantified in PSI (pounds per unit square inch). The pressure exerted (in psi) at the base of a column of water is 0.433 x Head (in feet). ![]() This water supply graph shows a) static pressure at 60 PSI, b) residual pressure at 55 PSI at 300 GPM, and c) system demand at 60 PSI and 400 GPM. Usually, this means a municipal water connection, but NFPA 13 allows tanks, ponds. PSI or pounds per square inch is a unit of pressure. Every fire sprinkler system needs a reliable water supply. ![]()
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