n below Question 3 A pump is installed in the pipeline betwe

n below Question 3) A pump is installed in the pipeline between If the head of the pumphp) is 80 met ermine the flow rate in the pipeline( e length of the pipe diameter is 300 mm. z,=1000 m No Q 0 o = 900 02 # .02

Solution

The provided question seems to discuss flow from B to A. Pumps are usually assisted by non-return valves to arrest the reverse flow and usually operates in one direction only (and the direction is shown)

For the reservoir \'A\' with water at 1000m elevation, the total head will be contributed by the potential head only since the other energy heads are zero.

Water in the reservoir B has a less total energy head of 900m. Flow can happen only from higher energy heads to lower energy heads.If the flow to be possible from B to A, we have to supply a minimum amount of energy head equal to( =100 meters+possible losses) to the water in B.But the pump can only impart 80 meter head. So flow is not possible from B to A. That is explained in the solution.

(But if there are no valves assciated, pipes are open to welcome flow from A, and Pump will not cause any disturbance in the reverse flow. We can proceed by Bernoullis equation and we will get a possible flow from A to B through the pipe)