Water Flow Characteristics
時間：2016-07-09 10:38:36點擊：次
The friction loss in hydraulic flow can be evaluated through the use of various low coeficients. One such coefficient is the Hazen-Williams C factor. This factor for PVC and CPVC plastic piping systems has been set at C = 150. The following formulae express the friction loss in feet of water and the water velocities in feet per second.
Friction loss is based on the Hazen Williams formula
f － friction head loss in feet of water per100 feet of pipe
C－constant for inside pipe roughness (C = 150for
extruded smooth wall thermoplastic pipe)
Q－low in U.S. gallons per minute
di－inside diameter of pipe in inches
The value of C = 150 for thermoplastic pipe is based onengineering measurements made with new and usedthermoplastic pipe in several laboratories. Thus, thevalue of C = 150 has a conservative bias. Using C =150, the equation reduces to
Water velocities in feet per second V may be calculated as follows:
TYPICAL VALUES OF THE HAZEN-WILLAMS COEFFICIENT
APPROXIMATE FRICTION LOSS IN PVC AND CPVC FITTINGSIN EQUIVALENT FEET OF STRAIGHT PIPE
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