Water Flow Characteristics

时间：2016-07-09 10:38:36点击：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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