Method and device for monitoring performance of internal pump
AssigneeHitachi, Ltd.
InventorsHideo Soneda, Kenichi Yasuda, Kumiaki Moriya
Life of this patent
Estimating the term…
Abstract
A method for monitoring the performance of internal pumps in a plant in which a coolant is driven through plural internal pumps, said method comprising measuring the pump motor power input to the motor driving said pump; estimating the power input to said pump motor during a test performed outside said plant corresponding to the pump speed and the pump flow measured within said plant; computing a pump motor input power ratio based on said measured value and said estimated value; and detecting the variation in the performance of said internal pumps.
Claims6
A method for monitoring the performance of internal pumps of a plant in which a coolant is driven through plural internal pumps, the method comprising the steps of:
- measuring a pump motor power input to the motor driving said pumps;
- estimating the power input to said pump motor during a test performed outside said plant corresponding to the speed of said pumps and the pump flow measured within said plant;
- computing a pump motor input power ratio based on said measured value and said estimated value;
- and
- detecting the variation in the performance of said internal pumps.
A device for monitoring the performance of internal pumps in a plant in which a coolant is driven through plural internal pumps, said device comprising a pump performance ratio computing unit for taking in the differential pressure of the pump portion, the pump speed, the pump motor power input of the motor driving said pump, and the pump flow which are measured for each of the actual pumps in the plant, and computing the ratio of said pump motor power input of said actual pump to the pump motor power input based on the result of a test performed in advance outside said plant;
- and a pump performance ratio display device for said computed input power ratio of the pump motor.
Dependencies are inferred from the claim text.