I'm a newcomer here. I work in a bio-ethanol plant. The valves in following services will be considered critical (in the opinion of our Contractor): 1) Safety and relief valves. 2) Control valves in the severe corrosive/erosive service if specified by Licensor / Owner. 3) Valves for which Licensor has required specific performance testing like helium testing etc. 4) ESD valves in inventory isolation service 5) Valves with gearbox or actuator on extended bonnet 6) Main isolation valves for HHP Boilers in HHP steam service. The valves in vent, drain, instrument isolation and other small diameter valves in HHP steam service are excluded from the critical valves list. 7) Two slide valves in Regenerator Flue gas service. In my experience the following types are definitely CRITICAL, their very definition explains why.ESDV = Emergency Shut Down Valve.EBDV = Emergency Blow Down Valves.SRV = Safety Relief Valves.The use of the word CRITICAL in specifications used to be easily understood/interpreted, as it was directly linked to conditions of: product ,service, performance, hazard.

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