Two reservoirs, at the same level, are connected with $600$m long galvanised steel pipe $($take internal diameter $75$mm$,$ roughness $0\mathrm{.}15$mm$).$ The pump connecting the two reservoirs is pumping water at $750$ L min$-1.$ Both reservoirs have gate valves $($loss coefficient $0\mathrm{.}15)$ for isolation, the pipework has $6$ elbows $($loss coefficient $0\mathrm{.}25),$ the pump being used has an inlet diameter of $100$ mm and outlet diameter of $76\mathrm{.}8$mm and there is a check valve after the pump $($loss coefficient $1)$ to avoid back flow. Calculate

The pump pressure rise,

The pump work per unit mass of fluid pumped, and

The required pump power.

Answer rating: 100% (QA)

To calculate the pump pressure rise we can use the Bernoulli equation along the pipe considering the losses through the valves elbows and the check va... View the full answer