Will using only isolation gas in the compressor cause damage to the primary and secondary seals?
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Some people say that it is sufficient to use only isolation gas before starting the oil pump. Could this lead to reverse flow of the isolation gas, flowing back through the secondary seal and the primary seal, thereby causing damage to the dry gas seal system?
The pressure of the isolation gas is much lower than that of the primary and secondary sealing gases, so it will not cause damage.
Could this lead to reverse flow of the isolation gas?
Could this lead to reverse flow of the isolation gas?
Waiting for a professional answer; no fixed mindsets needed.
What type of seal do you have? A dry gas seal? The compressor isn’t running, so stages 1 and 2 still possess static sealing capabilities; so how can there be any issue with air leakage? And if air does leak in, how would that damage the seal?
“Will using only isolation gas in the compressor cause damage to the primary and secondary seals? ”The isolation gas issue isn’t clear, and your description of the compressor is also vague. It would be best to send a diagram or provide a clearer description of your equipment, so that we can focus on the relevant aspects and avoid deviating from the main topic of discussion. . .
Centrifugal compressor, series dry gas seal.
The pressure of the isolation gas is slightly higher than atmospheric pressure; nitrogen gas is used to create a barrier between the shaft seal and the bearing housing, thereby preventing the lubricating oil from leaking. The other end of this isolation gas mixes with any minor leaks that occur after the secondary sealing before being released into the atmosphere. This isolation gas is generally vented on-site, and there is essentially normal pressure between it and the secondary seal; it does not enter the secondary seal, let alone the primary seal
During normal operation, the exhaust gas from the isolation gas is combined with the exhaust gas from the secondary seal gas. Currently, only isolation gas is being injected; the emission of this isolation gas can overcome the pipeline resistance and reach the atmosphere. Therefore, there will be some pressure at the point where it meets the emissions from the secondary seal. Could this pressure cause the emissions to flow back through the secondary seal?
I checked online, and there are two different statements regarding the commissioning of series-connected sealing gas. One is spaced by one or two, the other is spaced by one and two; I really want to figure this out right now.