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The Hazen-Williams formula can be used to calculate the pressure loss in a length of pipe due to friction dependent on the flow. This equation is commonly used for pressure drop calculations in American fire sprinkler systems, water distribution systems, and irrigation systems.
Additional recommended knowledge
Pd = pressure drop in pounds per square inch / foot
Q = flow in gallons per minute
C = factor (friction loss coefficient) - the higher the C factor, the smoother the pipe. Typical C factors used in design, which take into account some increase in roughness as pipe ages are as follows:
d = inside hydraulic diameter (inch)
An alternate form of the Hazen Williams Equation is:
V = Velocity (in feet per second)
C = as above
Rh = Hydraulic Radius (in feet) (see Manning formula)
S = Energy Gradient or Friction Slope (hf/L)
In SI units
C = factor (friction loss coefficient)
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Hazen-Williams_equation". A list of authors is available in Wikipedia.