Page 143 - Water and wastewater engineering
P. 143
3-40 WATER AND WASTEWATER ENGINEERING
3-8. For the system head curve shown in Figure P-3-8 , select a pump. Specify the fol-
3
lowing at the average flow rate of 9,000 m /d: (1) BEP, (2) number of stages,
(3) efficiency at BEP, (4) the operating range of flow rate, and (5) motor power.
Sketch and label (1) the depth of the wet well and (2) the location of the pump intake.
Maximum total head
50
Total dynamic head, m 40 Minimum total head
30
5,000 10,000 15,000 20,000
Flow rate, m 3 /d
FIGURE P-3-8
3-9. For the system head curve shown in Figure P-3-9 , select a pump. Specify the fol-
3
lowing at the average flow rate of 24,000 m /d: (1) BEP, (2) number of stages,
21 Maximum total head
20 Minimum total head
Total dynamic head, m 19
18
17
16
15
10,000 20,000 30,000 40,000 50,000
3
Flow rate m /d
FIGURE P-3-9
