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Classification And Advantages And Disadvantages Of Dry Gas Seals For Centrifugal Pump
Oct 24, 2017

With the "gas block" instead of the traditional "liquid clogging" principle, that is, with the pressure seal gas instead of pressure seal fluid to ensure that the process medium to achieve "zero escape"; the entire package of non-contact operation, the power consumption is only traditional double- Sealed 5%, the service life of more than 5 times longer than the traditional seal;

The centrifugal pump conveys the liquid as a liquid. According to different working conditions, the following types of seals can be used:

1, double end dry gas seals

Double end dry gas seals can be used in the vast majority of centrifugal pump shaft seal, it has the following characteristics:

1) With the "gas block" instead of the traditional "liquid block" principle, that is, with pressure seal gas instead of pressure seal fluid to ensure that the process medium to achieve "zero escape";

2) The whole package is non-contact, its power consumption is only 5% of the traditional double-ended seal, the service life is 5 times longer than the traditional seal;

3) Simple structure of the auxiliary system to ensure that the process media from pollution and process media does not leak to the atmosphere, completely out of the traditional double-face mechanical seal on the oil system. Sealing gas using industrial nitrogen or industrial instrument wind, the pressure is higher than the medium 0.15-0.2MPa.

Pumps with double-ended dry gas seals is the lack of:

1) need a certain pressure of the gas source, gas pressure at least higher than the medium pressure 0.2MPa;

2) have a trace of gas into the process.

2, series dry gas seals

Pump series dry gas seals has the following characteristics:

1) dry gas seals and contact with the mechanical seal in series, the main mechanical seal, dry gas seals for the sub-seal;

2) between the dry gas seals and the main seal through the nitrogen, to ensure that the main seal has a certain back pressure, greatly extending the main seal of the service life;

3) the main seal leakage process media with the seal gas into the torch to ensure that the process medium does not leak to the atmosphere, is an environmentally friendly seal;

4) After the main seal failure, dry gas seals for a short time to play the main seal, to prevent the process medium to the atmosphere a lot of leakage.

5) The service life of this type of seal depends on the service life of the mechanical seal, usually about 2-3 years.

6) The seal is mainly used for volatile media occasions, such as liquid hydrocarbon media; sealing gas pressure is not demanding.





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