Centrifugal pump with dry gas seal classification and advantages and disadvantages
Centrifugal pump transport medium is liquid. According to different working conditions, the following types of seals can be used:
1, double-sided dry gas seal Double-sided dry gas seal can be used in the vast majority of centrifugal pump shaft seal, it has the following characteristics:
1) Replace the traditional "liquid blockage" principle with "gas blockage", that is, replace the pressured sealing liquid with pressurized sealing gas to ensure "zero escape" of the process medium;
2) The entire seal non-contact operation, the power consumption is only 5% of the traditional double-sided seal, the service life of more than 5 times longer than the traditional seal;
3) A simple auxiliary system to ensure that the process medium is not contaminated and the process medium does not leak to the atmosphere, completely get rid of the traditional dual-end mechanical seal on the oil system. Sealed gas using industrial nitrogen or industrial instrumentation, the pressure is higher than the medium 0.15-0.2MPa.
Pump double-sided dry gas seal is inadequate is:
1) gas source that requires a certain pressure, gas pressure at least higher than the medium pressure 0.2MPa;
2) a trace of gas into the process.
2, series dry gas seal pump series dry gas seal has the following characteristics:
1) dry gas seal and contact type mechanical seal used in tandem, the mechanical seal is the main seal, the dry gas seal is the secondary seal;
2) Dry gas seal and the main seal between the access to nitrogen, to ensure that the main seal has a certain back pressure, greatly extending the life of the main seal;
3) Leakage of the main seal of the process medium with sealing gas into the torch to ensure that the process medium does not leak to the atmosphere, is an environmentally friendly seal;
4) After the failure of the main seal, the dry gas seal plays a main role of sealing for a short period of time to prevent a large amount of leakage of the process medium to the atmosphere.
5) The life of this type of seal depends on the service life of the mechanical seal, which is usually about 2-3 years.
6) The seal is mainly used for volatile media occasions, such as liquid hydrocarbon media; less demanding on the seal gas pressure.
The inadequacies of the seal are:
1) The seal is not yet a perfect dry gas seal, its overall performance is between the mechanical seal and dry gas seal.
2) The seal is suitable for volatile media occasions, the use of a narrow range.
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