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It should be noted that the Poiseuille formula for calculating a pipe's flow rate through pressure does not work so well for gases where additional information is required for an accurate computation. The graph illustrates a general case where that applies. Mineral oils, however, are somewhat compressible, so beware of using the formula for such cases.Īn example application is if one has manometers measuring the pressure of the fluid or gas at the start an the end of the section of piping that the flow rate is to be calculated for. Water is a good example of an incompressible fluid, and so is any hydraulic fluid.
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Some of the output units include: m 3/h, m 3/min, m 3/s, l/h, l/min, l/s, ft 3/h, ft 3/min, ft 3/s, yd 3/h, yd 3/min, yd 3/s, gallons per hour, gallons per minute. The output is in either imperial or metric units, depending on your selection. are accepted) in order to calculate the flow rate. In flow velocity mode one needs to know the flow velocity of the gas or fluid (feet per second, meters per second, km/h, etc. s, and cP (centipose) for dynamic viscosity.
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Supported input units include pascals (Pa), bars, atmospheres, pounds per square inch (psi), and more for pressure and kg/m In pressure difference mode the calculator requires the input of the pressure before the pipe (or venturi, nozzle, or orifice) as well as at its end, as well as its cross-section, e.g. If the substance is a liquid and its volumetric density is known the calculator will also output the mass flow rate (more information is required to calculate it for gases and it is currently not supported). This pipe flow rate calculator calculates the volumetric flow rate ( discharge rate) a gas or fluid (liquid) going through a round or rectangular pipe of known dimensions. Flow rate formula via pressure difference.