Force Required to operate reciprocating pump:
Fs = Wahs/ns
Where,
a= area of cylinder, m2
l= length of stroke, m
h = total height through which water is raised, m
P = force required to lift the piston, kg.( neglect friction and weight of the piston and connecting rod)
W = specific gravity of water, 1000 kg/m3
Fd = Wahd/nd
FT = Fs + Fd
Then, wt. of water raised in one stroke = wah
Work done in one upstroke = wah x l = P x l
Therefore, P = wah kg.
- When friction is neglected, P is independent of the diameter of the suction and delivery pipes.