Feedwater pump and inlet pipe vibration
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This post was last edited by qiubusan on 2010-4-26 20:05 There are three boiler feed water pumps, 2 are in use and 1 is in standby. The design flow rate is 85 cubic meters per hour, and the head is 536h water column. A single unit has been running for almost a year, and the operating flow rate is 50~60 cubic meters/hour, which is very stable. ； A few days ago, because the water supply volume increased to 80 cubic meters per hour, the user started another pump to run in parallel. However, a problem occurred. The two water supply pumps and the inlet pipe vibrated seriously. Please tell me what could be the reason? ? ?
My personal analysis is that there may be an air blockage in the water inlet main pipe. The original flow rate was smaller, so there was no impact. Now the flow rate suddenly increases, causing the flow rate to accelerate, causing vibration.
When two pumps are turned on at the same time, it is easy to cause insufficient inlet flow, resulting in vibration. The owner can close the outlet or slightly open the return line, and the vibration will be reduced or eliminated!
When two pumps are turned on at the same time, it is easy to cause insufficient inlet flow, resulting in vibration. The owner can close the outlet or slightly open the return line, and the vibration will be reduced or eliminated! =============================================================== There is a pre-pump in front of the feed water pump. Currently, the actual flow rate of both units is only 50% of the designed flow rate. Is it unlikely that the inlet is insufficient? thank you for your discussion
Insufficient water supply at the inlet will cause strong water evacuation, causing cavitation and vibration.
Whether the diameter of the inlet pipeline is appropriate and whether the two pumps are running at the same time. What is certain is that the pump has evaporated.