Mechanical equipment of buildings; a reference book for engineers and architects (1916)
Harding, Louis Allen, Willard, Arthur C. (Arthur Cutts), 1878-1960 · New York Wiley · leaf 398
obviously consist oftwo stages, for while a head of 250 ft. per stage is possible, it can usually be attained only at thesacrifice of efficiency. The head per stage is then 125 ft. 1500 1760 q =—= = 135 n = -,^= = 157Vl25 Vl25 The point determined by these values of q and n is then plotted as shown… … Fig. 26. Arrangement of Apparatus for Centrifugal Pump Test. would operate at about 98 per cent of its maximum efficiency. From Fig. 24, it is seen that themaximum efficiency of an 8-in. pump operating at 125 ft. per stage is 71 per cent. The efficiencyof the pump selected would therefore be about…
Building · Heating · Ventilation
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