Engineers who design safety systems are always mindful of a few basic truths: Anything can fail, so there should always be a backup. And sometimes, backups need backups. Looking at how this concept applies to pneumatically operated emergency shutdown (ESD) valves, and other similar on/off valves, is the main topic of Emerson’s Jeff Welch’s article in the November 2020 issue of Chemical Engineering.
Airset Regulators: Understanding a Critical but Often Overlooked Link in Safety Systems
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