Question

8. A 10-inch model pump delivering water at 180°F at 800gal/min and 2500 rpm begins to cavitate when the inlet pressure and velocity are 14 psia and 22 ft/s, respectively. Determine the required NPSH for (i) the model and (ii) a prototype which is 5 times larger and runs at 1000 rpm (Hint: Watch "Chapter 12-NPSH.mp4")

Answer 1

at 180°F pooperties of of water 60.6 167/973 OF watcy weight specific 1600 psia, Puz pressure 4,2 Pi-Por t pg ng CP (alpsH model 222 f 14x144-1600 = 2x32.2 60.6 14038 FE li 2 com пр. nm content (AlpsH) Don Cô model (MPSH) pitotype 14:38 Ft (NpsH) models Lovo 2500 nama np 1 - бр. Dm 55 2 2 one (Voo :-) +(592 ( 14.38 X 0500 Cacpsa) prototype = 57.55 ft (Nup sh" proto type