F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
73/164, 354/31,
F04B 49/06 (2006.01) F04B 49/08 (2006.01) G01F 1/00 (2006.01) G05D 7/06 (2006.01)
Patent
CA 1094349
ABSTRACT OF THE DISCLOSURE 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 relationship 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 fluid of different but known values of the viscosity-related property through the piping system during the "shake-down" testing.
294607
Bartley Thomas S.
Rosenblath Quinlan T. Jr.
Gowling Lafleur Henderson Llp
International Paper Company
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