After several years in the Industrial Gas industry, I am now working in a pharmaceutical facility that makes use of many positive displacement pumps. There are several instances where a positive displacement pump does not have over-pressure protection. Since pharmaceutical facilities do not handle high pressures, most personnel do not have a lot of experience with high pressure safety systems. I have been asked if a single pressure switch would suffice to protect a system from an over-pressure scenario.
From my experience, I know that relying on a single pressure switch to protect from over-pressure scenario is poor engineering practice but I would like to refer to a standard that explicitly states this. Is there any US standard, preferably enforced by law, that states a rupture disk or relief valve is the only acceptable protection? Any type of SIL device/systems are not an option for this type of facility. Pressures are around 100-150psig.
From my experience, I know that relying on a single pressure switch to protect from over-pressure scenario is poor engineering practice but I would like to refer to a standard that explicitly states this. Is there any US standard, preferably enforced by law, that states a rupture disk or relief valve is the only acceptable protection? Any type of SIL device/systems are not an option for this type of facility. Pressures are around 100-150psig.