Concept explainers
(a)
The discharge and brake horsepower required for one pump.
Answer to Problem 11.74P
The discharge required for one pump is
Explanation of Solution
Given Information:
Pump diameter, d = 32in
Fig 11.7a
From the figure, the best curve for 32-inch diameter:
Here, a & b = constants
From the curve find constants by taking 2 points
1st point:
Let,
2nd point,
Let,
Now, substitute,
Suction head = Pump head for single pump. So,
We know,
Substituting these values, we get,
Brake horsepower is given by:
Substituting,
We get,
Conclusion:
The discharge required for one pump is
(b)
The discharge and brake horsepower required for two pumps in parallel.
Answer to Problem 11.74P
The discharge required for two pumps in parallel is
Explanation of Solution
Given Information:
Pump diameter, d = 32 inch
Fig 11.7a
For two pumps in parallel, flow rate is half. Hence:
Substitute,
Brake horsepower is given by:
Substitute,
Conclusion:
The discharge required for two pumps in parallel is
(c)
The discharge and brake horsepower required for two pumps in series.
Answer to Problem 11.74P
The discharge required for two pumps in series is
Explanation of Solution
Given Information:
Pump diameter, d = 32in
Fig 11.7a
For two pumps in series, flow rate is two times the actual. Hence:
Substitute,
Brake horse power is given by:
Substitute,
The configuration with 2 pumps in series is the best since, it has the best efficiency.
Conclusion:
The discharge required for two pumps in series is
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Chapter 11 Solutions
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