Dry gas seal put into use
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When the dry gas seal is put into use, should the first level or the second level be put into use first? what's the difference
The isolation gas comes first, and the rest doesn’t matter in order.
Put the first level first, then the second level, otherwise the first level seal will be easily damaged.
Why do you need to invest in the first level and then the second level? Otherwise, it is easy to damage the first level seal.
How could the primary seal be damaged?
I haven't heard of it, what impact it will have, I'll wait for an expert to answer.
First put the isolation gas into use, then put in the first level, then put in the second level. When deactivating, first stop the second level, then stop the first level, and finally stop the isolation gas.
First turn on the isolation gas to ensure that lubricating oil does not enter the dry gas seal, then turn on the first level, and then turn on the second level. When deactivating, first stop the second level, then stop the first level, and finally stop the isolation air.
If the second level is put in first, the nitrogen from the second level will enter the first level and cause back pressure. Over time, it will cause certain damage to the dynamic and static seals of the first level!
Put in the isolation gas first, then put in the first-level sealing gas, put in the exhaust gas (the leakage of the first-level dry gas seal and the second-level labyrinth seal), and then put in the second-level sealing gas. It is necessary to ensure the positive pressure difference of the primary dry gas seal, for the reasons mentioned above.
Dry gas sealing principles: 1) Add sealing gas first, then add pre-gas ； Isolation gas does not matter in order ； 2) Add sealing gas first to prevent unclean pre-gas from flowing into the dry gas seal ； 3) Isolation gas: As long as you keep lubricating oil, you can't stop ； Otherwise, oil and gas will penetrate into the dry gas seal ； Note: To be on the safe side, the sealing gas is usually added first, then the pre-supply gas, and then the isolation gas. ； When stopped, as long as the oil pump does not stop and the case pressure is not 0, it will be on. Moreover, the isolation gas pressure is not as high as possible (0.03-0.04MPa·G). If it is high, it will easily carry oil mist. ；