By E. Shashi Menon
A undeniable language advisor to the instruments and strategies had to ascertain potency, this publication presents training engineers and senior box group of workers with a short, yet rigorous exposition of pumps, together with functions. Readers will locate specialist recommendation for picking out TDH, NPSH, BHP and motive force strength requisites, discharge temperature, parallel/series operation and their impression at the working stipulations; constructing system-head curves and function concerns; and pump choice for multi-product operations.
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Extra resources for Working Guide to Pumps and Pumping Stations - Calculations and Simulations
Therefore, in selecting the driver motor size, the pump power requirement over the entire capacity range must be determined, rather than that at the maximum capacity. 7) where K is a constant. 8) where co, clrand c2 are constants to be determined from the pump curve data. 740). 89. 6). 5). we calculate the BHPl through BHP, for the preceding seven sets of data. 325) = 1123 (rounded up) Repeating the preceding calculations for the remaining six sets of H, Q, and E values, we can develop the following data set for the BHP curve (note that all BHP values have been rounded off to the nearest whole number): I Q n ~ r n 11000 I BHP I1123 12000 I1403 13000 I1696 14000 12020 l5000 I2334 16000 12574 17000 I2720 I The BHP versus capacity Q curve can now be plotted from the preceding data.
The constant speed motors usually drive the pump at speeds of approximately 1800 FWM or 3600 FWM. The actual speed depends on the type of electric motor (synchronous or induction) and is a function of the electrical frequency and the number of poles in the motor. K. and many other countries). 9) Considering a 4-pole motor and a frequency of 60 Hz, the synchronous speed of the motor is Ns = 120 X 60/4 = 1800 RPM Similarly, for a 2-pole motor, the synchronous speed is Ns = 120 X 60/2 = 3600 FWM For 50 Hz frequency, these become Ns = 120 X 50/4 = 1500 FWM for a 4-pole motor, and Ns = 120 X 50/2 = 3000 RPM for a 2-pole motor.
In the next chapter, the performance of a centrifugal pump and how it is affected by the liquid viscosity will be discussed in more detail. 1 A centrifugal pump has the following H-Q and E-Q data taken from the pump curve. Determine the coefficient for a second-degree polynomial curve using LSM. O Calculate the HHP at the maximum capacity. What is the BHP when pumping water at the BEP? 5% (a) Calculate the power in kW when pumping water at the BEP. 74), what power is required at the BEP? 4 A three-stage double suction centrifugal pump, 10 in.