Dry gas seal of rich gas compressor
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What’s causing oil to drip from the dry gas seal vent pipe of the rich gas compressor? The dry gas seal was just replaced after maintenance
Could the oil pressure be higher than the dry gas seal pressure, resulting in oil leakage?
Has there been any change in the leakage rate? What is the level of dry gas sealing? Could oil and gas being released elsewhere cause condensation to form in the vent pipeline! If the replacement was done improperly and lubricant leaks out, the dry gas seal will be damaged. Also, check whether the pressure of the isolation gas is higher than that of the lubricant! When starting up the machine, should isolation gas be used first and then lubricating oil?
The isolation gas is purified air, with a pressure of 0.7 Mpa; the lubricating oil pressure is around 0.25 Mpa. If there are no issues with the dry gas seal, then wouldn’t we avoid such problems?
Shouldn’t the shielding gas be nitrogen?
Nitrogen is used for the main sealing gas and buffer gas, while nitrogen or purified air can be used as the isolation gas
Here on our end, it’s the same: purified air is used for isolation gas, while nitrogen is used for sealing and pre-filter air