Fluid handling – Processes – Involving pressure control
Reexamination Certificate
2004-06-14
2008-12-16
Lee, Kevin L (Department: 3753)
Fluid handling
Processes
Involving pressure control
C137S012000, C137S487500, C073S001720, C700S038000, C700S282000, C702S114000, C702S183000
Reexamination Certificate
active
07464721
ABSTRACT:
A Safety Instrumented System for use with a process control system receives pressure of process fluid in the process piping. A valve positioner positions a valve which controls flow of process fluid through the process piping. The valve positioner is caused to perform a partial stroke of the valve or otherwise introduce a perturbation into the process. A resulting change in sensed pressure due to the perturbation is used to diagnose operation of the process.
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Huisenga Garrie
Longsdorf Randy
Perry Dale
Schumacher Mark
Lee Kevin L
Rosemount Inc.
Westman Champlin & Kelly P.A.
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