Pumps – Condition responsive control of pump drive motor – Single motor control element responsive to means sensing...
Patent
1977-01-21
1978-08-22
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
Single motor control element responsive to means sensing...
417 20, 417 22, 417 54, F04B 4906, F04B 4908
Patent
active
041085744
ABSTRACT:
Apparatus and process for automatically measuring and controlling the instantaneous flow rate of a liquid in a piping system by varying the speed of a centrifugal pump in response to a flow rate signal determined indirectly by sampling two flow-related parameters associated with the pump and pump motor and then converting in an on-line computer the two measurements to the corresponding unique flow rate value by the use of previously determined mathematical relationships stored in the computer. The mathematical relationships are derived from data correlating flow rate with the two flow-related variables, which data is taken with a flow meter and control valve temporarily installed in the piping system during the "shake-down" testing of the piping system. A third flow-related variable is sampled, a pair of flow rate values determined, and an alarm activated in response to the difference between the values to provide the additional feature of pump mechanical performance monitoring. A viscosity-related property of the fluid also is determined indirectly by the use of a mathematical relationship whenever three flow-related variables are monitored, the mathematical relationships having been derived from data taken by running fluids of different but known values of the viscosity-related property through the piping system during the "shake-down" testing.
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patent: 3966358 (1976-06-01), Heimes
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patent: 4026668 (1977-05-01), Culhane et al.
Bartley Thomas S.
Rosenblath, Jr. Quinlan T.
Freeh William L.
International Paper Company
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