Q3. Only Q3. Figure 21.22 gives the characteristics of a series of centrifugal pumps. Calculate the specificspeed for the 9/2, 102, and 11/2 in. impeller sizes.Q4. The pump of 11/2 in. impeller diameter for which characteristics are shown in Figure 21.22is used in a piping system taking cooling water from a river and delivering it to a stand-pipe.Flow is through 8 in. Sched. 40 steel pipe and the required lift is 70 ft. Equivalent pipe length,including entrance, exit, and fitting losses is 300 ft plus that contributed by a gate valve thatcontrols the flow. The pump is driven by a 75 HP motor. How far can the valve be opened beforethe pump overloads the motor?Efficiency60 brake11-in. impeller14011-in. impellerhorsepower130120 10-in. impeller50 bhp11010-in. impeller10040 bhpI 909in. impeller75 bhp8060 bhp70601775 rpm5040H, total head, feet of fluid flowing100 bhp

We know the parameters of a series of centrifugal pumps in this question, thus we need to determine…

Answered: Q3. Figure 21.22 gives the…

Q3. Figure 21.22 gives the characteristics of a series of centrifugal pumps. Calculate the specific speed for the 92, 102, and 112 in. impeller sizes.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.

Question

Q3. Only

Q3. Figure 21.22 gives the characteristics of a series of centrifugal pumps. Calculate the specific
speed for the 9/2, 102, and 11/2 in. impeller sizes.
Q4. The pump of 11/2 in. impeller diameter for which characteristics are shown in Figure 21.22
is used in a piping system taking cooling water from a river and delivering it to a stand-pipe.
Flow is through 8 in. Sched. 40 steel pipe and the required lift is 70 ft. Equivalent pipe length,
including entrance, exit, and fitting losses is 300 ft plus that contributed by a gate valve that
controls the flow. The pump is driven by a 75 HP motor. How far can the valve be opened before
the pump overloads the motor?
Efficiency
60 brake
11-in. impeller
140
11-in. impeller
horsepower
130
120 10-in. impeller
50 bhp
110
10-in. impeller
100
40 bhp
I 909in. impeller
75 bhp
80
60 bhp
70
60
1775 rpm
50
40
H, total head, feet of fluid flowing
100 bhp

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