Issues regarding the vibration of the boiler feed water pump
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One of the boiler feed pumps in my workshop, which has just been overhauled, is of the ZDG250-135*12 model. During testing, when the outlet was closed, the vibration at the drive end was 10.1 mm/s; however, once the outlet was fully opened, the vibration at the drive end was 2.5 mm/s vertically and 2.2 mm/s horizontally； Non-driven end: vertical 1.8 mm/s, horizontal 2.4 mm/s ； The amplitude at the driven end is 0.016 mm vertically and 0.019 mm horizontally, while at the undriven end it is 0.007 mm vertically and 0.021 mm horizontally. The system has been in operation for 24 hours now with little change in vibration levels. What could be causing this, experts?
It works fine under normal conditions; that’s okay
The vibration is high when it’s not in operation; could it be that the outlet pressure is also unstable? If so, that’s the reason.
Ultimately, it was found that the issue was caused by a damaged spring in the empty discharge check valve, which led to insufficient minimum flow.