Partial stroke testing with pulsed control loop

Details Partial stroke testing with pulsed control loop Partial stroke testing with pulsed control loop

2008-09-22

2011-11-15

Raevis, Robert (Department: 2856)

Measuring and testing

Instrument proving or calibrating

Fluid pressure

C073S168000

Reexamination Certificate

active

08056390

ABSTRACT:
Partial Stroke Testing (PST) equipment and methodologies provide PST data for one or more valves by withholding or applying power to the one or more valves for periodic time periods that increase by an incremental amount until the one or more valves partially stroke or a maximum test period expires.

REFERENCES:
patent: 5030939 (1991-07-01), Lovick
patent: 6789563 (2004-09-01), Filkovski et al.
patent: 6805328 (2004-10-01), Filkovski et al.
patent: 2002/0145515 (2002-10-01), Snowbarger et al.
Holtgraver, Ed; Article entitled “Emergency Shutdown Valves: Options for Partial Stroke Testing”; Summer 2008 edition of Valve Magazine; pp. 28-33.
Anonymous; “Mechanical Limit Switches”; Engineers Edge website —http://www.engineersedge.com/instrumentation/limit—switches.htm, 2001-2008.

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