Centrifugal pump systems tutorial by Chaurette J.

By Chaurette J.

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Table B1 provide some values for various materials. 8 m/s2 [5a] The pipe friction loss ∆HFP is calculated with equation [6] ∆H FP ( ft fluid) = ∆H FP  ft fluid  L( ft pipe)  × L  100 ft pipe  100 [6] ∆H FP  fluid  L(m pipe)  × L  100 m pipe  100 [6a] or in the metric system ∆H FP (m fluid) =  Copyright Fluide Design Inc. 469” internal pipe diameter) new steel pipe with a flow rate of 149 gpm for water at 60F and a pipe length of 50 feet. 13 cSt. The average velocity v in the pipe is: v ( ft / s ) = 0 .

Remember that you must also take into consideration the level of the water in the suction tank. If the water level is 10 feet below the pump suction connection then the static head will be 10 + 15 = 25 feet. Therefore the total head will have to be at least 15 feet plus the friction head loss of the fluid moving through the pipes. Figure 30 Static head. 12. What is friction head Friction head is the amount of energy loss due to friction caused by fluid movement through pipes and fittings. It takes a force to move the fluid against friction, in the same way that a force is required to lift a weight.

Copyright Fluide Design Inc. 41 I mentioned that we can measure head at the discharge side of the pump by connecting a tube and measuring the height of liquid in the tube. Since the tube is really only a narrow tank we can use the pressure vs. 31 to determine the discharge pressure. Alternatively, if we put a pressure gauge at the pump discharge, we can then calculate the discharge head. Figure 36 Discharge static head plus friction head equals pump discharge head. We can calculate the discharge pressure of the pump based on the total head which we get from the characteristic curve of the pump.

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