Hello Stresser,
I 'm having vibration trouble on suction and discharge line boiler feed water pump, vibration only when the condition of a minimum flow / full kick back only (shut the discharge valve). Is there ever experienced it ? if I count on the natural frequency of the excitation frequency is already over.
Process condition:
Suction pressure: 2.9 kgf/cm2G
Discharge pressure: 160 kgf/cm2G
Kick back line pressure: 4,8 kgf/cm2G
Temperatur: 78 C
Pump RPM: 2980

Thanks,