Can safety valves be used in a one-main-one-redundant configuration?
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Can safety valves be used in a one-main-one-redundant configuration?
Our distillation tower is equipped with three safety valves at the top; I’m not sure if there is a spare one as well
It is possible; it should be able to switch when overpressure triggers opening.
Three safety valves, with two in use and one as a spare
Then let’s check whether the setting pressures of the two safety valves are the same If they’re not the same, it’s not one active and one standby!
These days, safety valve bypasses are often used in chemical engineering designs; they serve as a backup option.
Of course. In this case, there can be isolation valves at the inlets of the two safety valves, one open and the other closed, both of which should be locked to prevent accidental activation of both or closure of both. Replace them during the annual inspection of the safety valve.
Look at the design drawings – it says whether it’s one in use and one as a backup, or something like that
Based on the overhaul situation, it is overhauled once a year. Not for backup use.