Method for determining pump flow without the use of traditional sensors
First Claim
1. A method for determining pump flow in a centrifugal pump, centrifugal mixer, centrifugal blower or centrifugal compressor comprising:
- creating a calibrated power curve at closed valve conditions at several speeds;
calculating coefficients from a power vs flow curve based on a pump'"'"'s power ratio; and
solving a power equation for flow at the current operating point.
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Accused Products
Abstract
A technique for determining pump flow without using traditional sensors features steps and modules for creating a calibrated power curve at closed valve conditions at several speeds; calculating coefficients from a normalized power curve based on a pump'"'"'s power ratio; and solving a polynomial power equation for flow at the current operating point. The calibrated power curve may be created by increasing the speed of the pump from a minimum speed to a maximum speed and operating the pump with a closed discharge valve. This data is used to correct published performance for shutoff power and best efficiency point power at rated speed in order to determine the pump'"'"'s power ratio. It is also used to accurately determine closed valve power at the current operating speed. The pump'"'"'s power ratio is determined by the equation: Pratio=Pshutoff @100%/PBEP
116 Citations
57 Claims
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1. A method for determining pump flow in a centrifugal pump, centrifugal mixer, centrifugal blower or centrifugal compressor comprising:
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creating a calibrated power curve at closed valve conditions at several speeds; calculating coefficients from a power vs flow curve based on a pump'"'"'s power ratio; and solving a power equation for flow at the current operating point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A controller for determining pump flow in a centrifugal pump, centrifugal mixer, centrifugal blower or centrifugal compressor comprising:
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a module configured for creating a calibrated power curve at closed valve conditions at several speeds; a module configured for calculating coefficients from a power vs flow curve based on a pump'"'"'s power ratio; and a module configured for solving a power equation for flow at the current operating point. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A system having a controller for determining pump flow in a centrifugal pump, centrifugal mixer, centrifugal blower or centrifugal compressor, the controller comprising:
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a module configured for creating a calibrated power curve at closed valve conditions at several speeds; a module configured for calculating coefficients from a power vs flow curve based on a pump'"'"'s power ratio; and a module configured for solving a power equation for flow at the current operating point. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
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Specification