NON-IDENTICAL PUMPS PROBLEM 1
The characteristic curves of a centrifugal pump X can be constructed from the following table:
Delivery Q (m3/s)
0
0,075
0,15
0,2
0,25
0,3
0,35
Pump head H (m)
73
72
70
66
61
52
38
Efficiency η (%)
0
47
70
77
77
74
66
The characteristic curves of a centrifugal pump Y can be constructed from the following table:
Delivery Q (m3/s)
0
0,1
0,15
0,2
0,25
0,3
Pump head (m)
60
58
55,5
51,5
46
38
Efficiency η (%)
0
62,5
82
87
84
66
A piping system is used to deliver water to a tank 40 m above the level of the suction pit. The suction pipe and the
delivery pipe have diameters of 350 mm, and their total length is 160 m. Take the friction factor f = 0,0065.
Graphically, determine the discharge and the power required by each pump, respectively, if pump X and pump Y
are connected in parallel to the piping system.
NON-IDENTICAL PUMPS PROBLEM 2
The characteristic curves of a centrifugal pump X can be constructed from the following table:
Delivery Q (m3/s)
0
0,075
0,15
0,2
0,25
0,3
0,35
Pump head H (m)
73
72
70
66
61
52
38
Efficiency η (%)
0
47
70
77
77
74
66
The characteristic curves of a centrifugal pump Y can be constructed from the following table:
Delivery Q (m3/s)
0
0,1
0,15
0,2
0,25
0,3
Pump head (m)
60
58
55,5
51,5
46
38
Efficiency η (%)
0
62,5
82
87
84
66
A piping system is used to deliver water to a tank 100 m above the level of the suction pit. The suction pipe and
the delivery pipe both have diameters of 250 mm, and their total length is 160 m. Take the friction factor f =
0,0065.
Graphically, determine the discharge and the power required by each pump, respectively, if pump X and pump Y
are connected in series into the piping system.
Hydraulic Machines 3
Assignment Front Page