WebJun 10, 2015 · Frictional head losses are losses due to shear stress on the pipe walls. The general equation for head loss due to friction is the Darcy-Weisbach equation, which is where f = Darcy-Weisbach friction factor, L = length of pipe, D = pipe diameter, and V = cross sectional average flow velocity. Faizan Shabbir. Follow. WebH = h s + h d. Manometric Head (Hm): The manometric head is defined as the head against which a centrifugal pump has to work. It is given by the following expressions: H m = Head imparted by the impeller to the water – Loss of head in the pump. H m = Total head at the outlet of the pump – Total head at the inlet of the pump.
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