Method and apparatus for pump protection without the use of traditional sensors
First Claim
1. A method for controlling the operation of a centrifugal pump, centrifugal mixer, centrifugal blower or centrifugal compressor comprising:
- comparing an actual flow value and a corrected threshold flow value that is corrected based on the speed of the pump in order to determine the pump operating condition.
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Accused Products
Abstract
The present invention provides protection for centrifugal pumps while differentiating between dangerous operating conditions (e.g. dry running, minimum flow and runout) and/or conditions where transient conditions (e.g. closed valve operation) may occur and the protection can be revoked once the condition clears. The methodology utilizes a calculated flow value which can be mathematically determined from a calibrated closed valve power vs speed curve and/or various pump and motor parameters such as speed, torque, power and/or differential pressure or from calibrated flow curves stored in the evaluation device. The calculated flow value is then compared to threshold values of flow associated with these adverse operating conditions.
107 Citations
77 Claims
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1. A method for controlling the operation of a centrifugal pump, centrifugal mixer, centrifugal blower or centrifugal compressor comprising:
comparing an actual flow value and a corrected threshold flow value that is corrected based on the speed of the pump in order to determine the pump operating condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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17. A controller for controlling the operation of a centrifugal pump, centrifugal mixer, centrifugal blower or centrifugal compressor, comprising:
a module configured for comparing an actual flow value and a corrected threshold flow value that is corrected based on the speed of the pump in order to determine the pump operating condition. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 60, 61, 62, 63, 64, 65, 66, 67, 68)
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34. A centrifugal pump system or system with other centrifugal device such as a centrifugal mixer, centrifugal blower or centrifugal compressor having a controller for controlling the operation of a centrifugal pump, centrifugal mixer, centrifugal blower or centrifugal compressor, the controller comprising:
a module configured for comparing an actual flow value and a corrected threshold flow value that is corrected based on the speed of the pump in order to determine the pump operating condition. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 69, 70, 71, 72, 73, 74, 75, 76, 77)
Specification