Centrifugal Pump Fundamentals #2

9 Questions | Total Attempts: 206  Settings  The fundamentals of the centrifugal pump seek to enable learners on how a pump works into the systems it’s installed in. Take the test below and assess your knowledge specifically on cunctation and discharge heads.

• 1.
• A.

• B.

• C.

• D.

• 2.
Calculate the Suction Head if the suction tank water level is 10’ above the center of the pump, the flow rate is 50 GPM through 100 foot of 2” schedule 80 new steel pipe, and there is 10 psig of air pressure cushion in the tank on top of the water.
• A.

26.68 ft

• B.

126.68 ft

• C.

226.68 ft

• D.

6.68 ft

• 3.
Calculate the Discharge Head if this pump pumps into a spray header that is 50’ above the pump centerline, the flow rate is 50 GPM through 200 feet of 2” pipe, and the pressure inside the spray header is 100 psi at said flow rate.
• A.

94 ft

• B.

194 ft

• C.

294 ft

• D.

9 ft

• 4.
Given the suction and discharge heads above, what is the duty point of this pump? (Flow and Head)?
• A.

25 GPM @ 267 ft

• B.

25 GPM @ 467 ft

• C.

50 GPM @ 267 ft

• D.

50 GPM @ 467 ft

• 5.
What does NPSHa mean?
• A.

• B.

• C.

• D.

• 6.
What does NPSHr mean?
• A.

• B.

• C.

• D.

• 7.
What happens when NPSHr is more than NPSHa?
• A.

Cavitation

• B.

Nothing

• C.

Water hammer

• D.

Implosion

• 8.
Regarding pump component failures, about what percentage of failures are related to the mechanical seal?
• A.

49%

• B.

59%

• C.

69%

• D.

79%

• 9.
Regarding pump causes of failures, what percentage is caused by the seal components?
• A.

9%

• B.

19%

• C.

29%

• D.

39%

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