I found out recently that common practice with onshore facilities is that if an equipment is provided with a pressure safety valve, then a high pressure interlock¹ is not needed. This sounds like such a bad idea.
On it's face it sounds okay.
Except experienced process designers don't do this work, these kind of tasks get passed down the chain.
So I sure hope my classmates did a good job with their PSV sizing calculations back in their second year work terms...
1) A high pressure interlock would be a controller that acts automatically to isolate the vessel from the source of high pressure, e.g. closing inlet shutdown valves
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