It is required to pump cooling water from a storage pond to a condenser in a process plant situated 10m above the level of the pond. 200m of 74.2 mmid pipe
is available and the pump has the characteristics given below. The head loss in
the condenser is equivalent to 16 velocity heads based on the flow in the 74.2mm
pipe. If the friction factor is 0.003, estimate the rate of flow and power to be
supplied to the pump assuming 50% efficiency.
(10 marks
Discharge[m3/s)
10.8
14.04
18.0
20.16
2124
Head developed (mm) 0.0232
0.0213
0.0189
0.0152
0.011
​

Distance covered = speed x timethe distance traveled going against the stream = distance traveled with the stream.therefore it is the speed and the time that are the variables.as he travels the same distance both ways, speed x time is the same for each way.going upstream his speed is 4 kph; going downstream his speed is 6 kph.therefore we have two simultaneous equations: time upstream x 4 = time downstream x 6time upstream + time downstream = 60 minutestherefore we have the equation: time upstream = 6/10 hour, time downstream therefore = 4/10 hour.distance traveled at 4km/hr in 6/10 hour = 24/10 = 2.4km.check: distance traveled at 6km/hr in 4/10 hour = 24/10 = 2.4km.