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The integration of a flux over an area gives the volumetric flow rate. The SI unit is cubic metres per second (m 3 /s). Another unit used is standard cubic centimetres per minute (SCCM). In US customary units and imperial units, volumetric flow rate is often expressed as cubic feet per second (ft 3 /s) or gallons per minute (either US or ...
For showerheads, the standard for maximum flow rate continues to be 2.5 gallons per minute (gpm) (9.4 liters per minute (lpm)) as set by the Energy Policy Act of 1992. However, manufacturers now offer ultra-efficiency showerheads with maximum flow rate below 2.0 gpm (7.6 lpm).
The relationship between gallons per minute (gpm) and fixture unit is not constant, but varies with the number of fixture units. For example, 1000 FU is equivalent to 220 US gallons per minute (0.014 m 3 /s) while 2000 FU represents only 330 US gallons per minute (0.021 m 3 /s), about 1.5 times the flow rate.
SG is the specific gravity of the fluid (for water = 1), ΔP is the pressure drop across the valve (expressed in psi). In more practical terms, the flow coefficient C v is the volume (in US gallons) of water at 60 °F (16 °C) that will flow per minute through a valve with a pressure drop of 1 psi (6.9 kPa) across the valve.
Kitchen and bathroom faucets were limited to a flow rate of 2.2 gpm (gallons per minute) at 60 psi, and residential shower heads were limited to a flowrate of 2.5 gpm at 80 psi. [ 3 ] In response to an increasing number of water shortages and increased water utility rates there has been recent legislation by many states leading the way in water ...
where: [2] Q f = total residual flow during the test (gallons per minute); c = discharge coefficient (unitless). This is usually 1.0 if using a diffuser. If using a wand to measure the stagnation pressure, the coefficient value depends on the shape of the flow hydrant orifice.
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