The vibration phenomena of two steam feedwater pump is completely different.The 1A feedwater pump mainly exhibits intermittent fluctuations on #4 shaft vibration,while the 1B feedwater pump mainly exhibits a sudden increase on#1 and #2 shaft vibration within a specific speed range.Through on-site testing from TSI system and analysis,vibration characteristics of the two feedwater pumps were summarized and diagnosed.It was pointed out that the #4 fluctuations vibration of 1A feedwater pump were mainly caused by oil film instability,while the #1 and #2 vibration fluctuations of 1B feedwater pump were caused by airflow excitation,which caused by defects in the low-pressure steam inlet regulating valve.Through corresponding operation and maintenance measures,the abnormal vibration of the steam feedwater pump was successfully resolved.
steam feedwater pumpvibrationfault analysisoil film instabilityairflow excitation
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