If a centrifugal boiler feed pump operating...

Question 1 of 270705eccef9bbacbc34ba4d454cb

If a centrifugal boiler feed pump operating with a positive suction head vibrates, or becomes noisy, the cause could be __________.

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Question 1 of 27070

Q

If a centrifugal boiler feed pump operating with a positive suction head vibrates, or becomes noisy, the cause could be __________.

🔍 Key Concepts

• Cavitation in centrifugal pumps and what operating conditions promote it • Effect of air or vapor in the suction line on pump performance and noise • Common symptoms of mechanical wear (wear rings) versus hydraulic problems in pumps

💭 Think About

• Which condition is most likely to cause a rattling, crackling, or ‘gravel’ sound in a centrifugal pump that has positive suction head? • Would excessive suction pressure normally reduce or increase the risk of cavitation and noise? Think about Net Positive Suction Head (NPSH). • Do worn internal clearances typically cause vibration/noise suddenly, or a gradual loss of capacity and efficiency?

✅ Before You Answer

• Identify which options would tend to introduce vapor or air into the eye of the impeller • Decide whether positive suction head makes low-pressure (starvation) problems more or less likely • Consider which condition is most directly linked with cavitation and entrained air, which typically causes vibration, pitting, and a distinctive noise