Reasons for frequent leakage of mechanical seals in ordinary centrifugal pumps for C3 and C4 liquefied gases
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Reasons for frequent leakage of mechanical seals in ordinary centrifugal pumps for C3 and C4 liquefied gases
Are you using single-sided or double-sided?
1. There are relatively many impurities in the medium； 2. The pump’s operating conditions differ significantly from the actual conditions ； 3. There is a problem with the mechanical seal design of the pump
The pressure in C3 and C4 media is high, which easily causes domestic mechanical seals to fail.
Now they all have double-end seals, so little is exposed
This medium has a high saturated vapor pressure; to ensure liquid transport, the pipeline network is pressurized, which results in high pressure in the pump as well as in the sealing chamber. This leads to easy damage of the seals and leaks. Additionally, if the pressure is insufficient during transportation, the medium may vaporize, causing the pump to run dry with no liquid present, and resulting in dry friction of the seals
Indeed, it is recommended to upgrade to a cascade seal, as it is more reliable.
Our unit uses shielded pumps for C3 and C4
In fact, this represents a perspective that is applicable not only to the pump industry. With the emergence of newer devices, they will inevitably replace the older ones in certain fields, which constitutes the environment for the creation of new devices. Methods below the 8th floor were only temporary fixes, not solutions to the root problem. It is difficult to enhance core competitiveness without making breakthrough progress.
Pumps used for transporting liquid hydrocarbon media are considered to be pumps that handle high-risk media. The traditional single-face mechanical seal used for sealing is no longer sufficient to meet the requirements related to production, safety, and environmental protection; therefore, upgrades are necessary: double-face seals or dry gas seals should be employed； Improve the flushing protocol ； Add a leak-sealed emission system.
It is recommended to use a shielded pump, as it performs very well!