Which of the following is the appropriate equation used to compute minimum speed for starting a centrifugal pump?
(where Hm is the manometric head, g is acceleration due to gravity: D1 is the outside diameter of the impeller and D2 is the inlet diameter of the impeller.
1
\(\frac{60\sqrt{2gH_m}}{\pi \sqrt{D_1^2-D_2^2}}\)
2
\(\frac{12\sqrt{gH_m}}{\pi \sqrt{D_1^2-D_2^2}}\)
3
\(\frac{60\sqrt{2H_m}}{\pi \sqrt{D_1^2-D_2^2}}\)
4
\(\frac{48\sqrt{2gH_m}}{\sqrt{D_1^2-D_2^2}}\)
5
Question Not Attempted