Expert’s answer: How do you protect a tank for gas storage?
Basic or not, this one you really need to know! You took a look at Visaya’s content on level switches, right? You’ll discover a bunch of level switches out there – level protection, on/off controls, liquid, slurries, or solids – the list goes on.
For a tank with gas inside, the most important process variable is the pressure. So you need a transmitter to measure the pressure of the tank and send that data to the control system. But if the transmitter fails, then you need another layer of protection.
Here you can use a pressure. It can stop a process if the pressure varies too much from the setpoint. If that switch fails, then relief valves or rupture discs will kick in, hopefully avoiding an explosion. But it shouldn’t come to that.
Anyway, back to switches. Pressure switches come in a variety of options – diaphragm piston, Bourdon tube, solid-state, and more. Read up on them and find out which will work best for you!