If a centrifugal pump sealing line becomes...

Question 1 / 270705eccef9bbacbc34ba4d454ca

Question 1 of 270705eccef9bbacbc34ba4d454ca

If a centrifugal pump sealing line becomes restricted while operating under a negative suction head (suction lift), which of the following may occur?

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Question 1 of 27070

If a centrifugal pump sealing line becomes restricted while operating under a negative suction head (suction lift), which of the following may occur?

🔍 Key Concepts

• Operation of a centrifugal pump under suction lift (negative suction head) • Purpose of the seal water / sealing line to the pump gland and its effect on cooling and air leakage • How loss of sealing water can affect suction, temperature at the gland, and cavitation risk

💭 Think About

• What happens to the stuffing box or mechanical seal if cooling and sealing water are reduced or cut off during operation? • Under suction lift conditions, how would air leakage at the gland affect the pump’s ability to maintain suction and NPSH (Net Positive Suction Head)? • Could more than one of the listed effects logically occur at the same time if the sealing line is restricted?

✅ Before You Answer

• Confirm the function of the sealing (gland) line: it both cools/lubricates and prevents air entry on suction lift systems. • Consider whether air entering through the gland under suction lift can cause loss of suction and promote cavitation. • Before choosing, ask yourself if only one, several, or all listed effects would reasonably follow from a restricted sealing line in real pump operation.

Question 1 of 27070

If a centrifugal pump sealing line becomes restricted while operating under a negative suction head (suction lift), which of the following may occur?

The pump may lose suction.

The pump gland may overheat.

Pump may tend to cavitate.

All of the above

Question 1 / 270705eccef9bbacbc34ba4d454ca

Question 1 of 270705eccef9bbacbc34ba4d454ca

If a centrifugal pump sealing line becomes restricted while operating under a negative suction head (suction lift), which of the following may occur?

Back

Question 1 of 27070

If a centrifugal pump sealing line becomes restricted while operating under a negative suction head (suction lift), which of the following may occur?