Dry gas seal issues in liquefied gas pumps
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I have a gentle question: liquefied gas is equipped with a dry gas seal that uses nitrogen. Could this dry gas seal prevent the leaked liquefied gas from escaping in the event that the main seal fails? I’m not very familiar with this. Also, can dry gas seals fail? How can one determine that a dry gas seal is no longer functioning? What factors should be considered to make such a judgment? Thank you, dry gas seal for the pump
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If the main seal fails, the medium will enter the nitrogen seal and be carried away by the nitrogen; the ball in the elongated flow meter will rise, triggering a high-level alarm from the instrument’s interlock system.
Under normal conditions, the dry gas seal is in standby mode
This post was last edited by Anhui Liu Hua on 2026-3-2 at 10:46. It seems to be PLAN11+72+75 (or 76); the photos don’t show everything clearly. The design features a series of seals, and if the first main seal fails, liquefied gas will enter the second sealing system. This can be detected in the discharge systems of PLAN75 or PLAN76, where pressure will rise. If the second dry gas seal leaks, it will be evident on the seal gas supply panel of PLAN72, with a significant increase in flow rate. Generally, maintenance is required when the series of seals handle more than 2 cubic meters per unit time