Certification Quiz Can water boil at virtually any temperature? Why? True or Fal

Question

Certification Quiz

Can water boil at virtually any temperature? Why?

True or False; centrifugal pumps create a partial vacuum in the inlet piping during operation.

Lesson 7: Cavitation – Another Word for Trouble

Give 3 problems cavitation creates for centrifugal pump operator.

Does cavitation occur on the discharge side or intake side of the pump?

Certification Quiz

Cavitation bubbles collapse in the system, rather than burst like those in boiling pot of water. Which transmits more energy by their action?

Does cavitation occur when the NPSHa (available) at the pump suction inlet falls below or above the minimum NPSHr (required) by a particular pump? Why?

You are working in a dairy processing plant. Your boss points to 2 pumps which are transferring milk from the individual holding tank to a process area. He tells you pump B does not seem to be getting the milk to the processing area as well as pump A. What might be the problem and what could you do to change the situation?

Explanation / Answer

1) Yes water can boil virtually at any tempreature above 100 degree celcius because it is the boiling tempreature of water.

2) True,

explanation: it is true that there is creation of partial vaccum which is responsible for sucking in the water.

3) The cavitation in centrifugal pump causes following problems.

a. Causes destruction of impeller

b. causes premature seal & bearing failure.

c. Decrease flow of pressure

4) Cavitation is caused on the pump intake side.

5) Cavitation bubbles collapse in the system because they have a short life span and is about 3 milliseconds.

6) yes the suction cavitation occurs when the NPSHa is available at pump suction inlet falls below or above the minimum NPSHa and potential causes for the same are causes are. entrained air in water,improper suction piping, too many elbows too close to inlet.

7) here cavitation must have occured in both pipes due to cavitation bubbles and impeller must be damaged it shall be change for both pumps as soon as possible.

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