On the dry gas seal of pumps
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Dear experts, I have a question: as an operator on site, how can one objectively determine whether there is a failure in the dry gas seal or in the mechanical seal?
Check the nitrogen pressure and flow rate, as well as whether there is medium in the small tank on the ground.
Do you mean the small tank on the ground – is it the nitrogen tank used to hold nitrogen gas for sealing?
Well, if the mechanical seal fails, there will be leakage; otherwise, just check the pressure of the sealing gas
The poster is referring to the purge gas used on the seal of cold pumps. This gas does not serve a sealing purpose; it is a protective measure intended to prevent the seal from freezing at low temperatures.
I’m also very interested in dry gas seals
No,,,,,,,
It should be the buffer tank in front of the torch; it’s usually located at the system site
One is the change in pressure, and the other is whether there are any signs of leaked material!
Generally, pump seal leakage is measured by the temperature of the seal gas leakage! For example, the leakage temperature of the seal gas in a Cryostar cryopump ranges from -20 to -60 degrees. If this leakage temperature drops below -120 degrees, the pump will shut down as a protection measure; in other words, it’s necessary to replace the seal
Generally, pump seal leakage is measured by the temperature of the seal gas leakage! For example, the leakage temperature of the seal gas in a Cryostar cryopump ranges from -20 to -60 degrees. If this leakage temperature drops below -120 degrees, the pump will shut down as a protection measure; in other words, it’s necessary to replace the seal