MONITORING METHOD AND DEVICE FOR PUMP VIBRATION

摘要

PROBLEM TO BE SOLVED: To predict and prevent an excessive vibration before the vibration increases due to resonance when a pump is started. SOLUTION: Pressure fluctuation and vibration of an internal fluid in a pipe or a casing are measured. By conducting frequency analysis of the obtained data, a vertical direction excitation vibration frequency fv, a horizontal direction excitation vibration frequency fh, an excitation vibration frequency fpgenerated by pressure fluctuation, a vertical direction natural frequency fvn, and a horizontal direction natural frequency fhnare obtained. When 2fhn-2fhn×0.05≤fv≤2fhn+2 fhn×0.05, or 2fhn-2fhn×0.05≤fp≤2fhn+2fhn×0.05, or when 0.975≤2fhn/fvn≤1.025 and fhis in a range between plus and minus 5% of fhnor fvis in a range between plus and minus 5% or fvn, an alarm warning an excessive vibration is issued. In addition, by recording the measurement and monitoring data, a discharge pressure, a discharge flow rate, and a rotating speed of the pump, and level of suction water, and referring these data in a continuous operation and operation condition change, an operation condition which may increase vibration can be avoided. COPYRIGHT: (C)2004,JPO