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Technical & Practical

January 1, 2011

Safety-Instrumented Systems: Control Valves As Final Elements

The scenarios presented here highlight the advantages and disadvantages of using a control valve in an SIS

Afton Coleman, Emerson Process Management

History is a constant reminder that accidents and catastrophic events can and do occur in process environments. As processes become more complex (for instance, allowing for greater operating temperatures and pressures to be used) and existing basic process...

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Comments (2) for Safety-Instrumented Systems: Control Valves As Final Elements
Excellent article. Should be expanded to include the advantages of xooy voting to increase reliability and also to prevent spurious trips
Posted by s ganeshan on Thursday, January 26, 2012 @ 08:24 AM
Interesting article, although quite misleading if applied to regulated industries. In general, control valves are less reliable than certified solenoid valves. Obtaining reliability data for control valves is difficult and there are not many certified options, if any. Using the same valve for both BPCS and SIS is not recommended and for good reason. In many jurisdictions it is even unlawful to use a combined valve as a safety valve. If kept separate, the BPCS can be counted on to give significant risk reduction but it should in general not be used as part of the SIS loop.
Posted by HÃ¥kon Dahl-Olsen on Monday, June 25, 2012 @ 09:42 PM

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