Question

In order to provide irrigation, water has to be pumped to
an elevation 120 m through a 600 mm pipe where the
pressure required at the higher elevation is 172 kPa. The
source of the water and the discharge point are at
atmospheric pressure. Irrigation requirements dictate
that water must be pumped at the rate of 1m3
/sec. The
loss of head due to friction and other factors is estimated
to be 2.4m. Elevation of the water source is 60 m. Find
the rating of the pump in horsepower if it is only 80%
efficient.
(See Figure-259 attached at the last page)
A. 620.11 kW C. 660.30 kW
B. 711.65 kW D. 835.25 kW

Figure 259: 2 600 mm Ø El. 120 P=172 KP Elev. 60 m.

Answer 1

Page 1 Pat higher clevations 172k pa 172 9.81 17.53m of water AZ - 12om- 6om 6om losses - 2.4m total head genuated by pump =p+AZ + losses. = 17:53 +60 +2.4 79.93m of water Power Proquaired Xx H * : 9.81* 79.93* i 784 11kW Rating of pump in ne Power meg 4*0745 a 784.11 0.8 x 0.745 1315.62 Hp