The issue of isolation gas in compressor dry gas seals
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The isolation gas serves to separate the oil side from the gas side. I would like to ask whether there is any interlock related to the pressure and flow rate of the nitrogen in this isolation gas – that is, whether the system will shut down automatically when the pressure or flow rate drops to a certain level. We don’t have this type of chain here; if there’s a problem with the nitrogen side, wouldn’t that damage the dry gas seal? Please share your thoughts
There is an alarm setting, but no interlock; moreover, there is no need for an interlock, as it’s not easy for oil to leak through. It's enough if there is an alarm.
I mean, if the nitrogen supply is suddenly interrupted, what effects would that have on the dry gas seal? Could you give me some guidance?
If the nitrogen supply is stopped, the oil pump should be turned off immediately to prevent damage to the seals.
Your question is about what to do when the nitrogen supply is interrupted. If that does happen and your nitrogen system stops functioning, the only option is to initiate an interlocked shutdown. If your low-pressure nitrogen supply is separate, then a short interruption in the supply of nitrogen should not cause much problem as long as you can restore it as soon as possible. If it’s not possible to restore it within a short time, then you’ll have to stop the operation.
If the nitrogen supply is interrupted, that is, if the isolation gas ceases to function, even in the event of a cascade shutdown, the oil pump cannot stop immediately. In such a situation, could the oil leak into the dry gas seal? Will it cause damage to the dry gas seal? Please give some advice
If the lubricating oil is only present in static-pressure equipment without any rotation, it hardly will migrate. If your nitrogen system truly experiences a situation where it cannot be restored for a short period of time, then you should consider adding accident sealing gas!