Tandem air film mechanical seal with middle labyrinth-

Tandem gas film mechanical seal with middle labyrinth

　2018-09-19　　

Tandem air film mechanical seal with middle labyrinth:

If the process medium is not allowed to leak into the atmosphere, and the buffer gas is not allowed to leak into the process medium, a labyrinth seal can be added between the two-stage mechanical seals of the series structure to form a series gas film mechanical seal with a middle labyrinth , As shown in Figure 4-4. When the sealing of this structure works, the pressure of the process gas is reduced by the medium side sealing. The leaked process gas is discharged to the flare through the interface 'C'. The atmosphere side seal is pressurized by a buffer gas (nitrogen or air) through the port 'B'. The pressure of the buffer gas ensures that there is a continuous gas flow through the labyrinth to the exit of the torch. 169 mechanical seal

Figure 4-4 Tandem structure with middle labyrinth

This type of mechanical seal is used for dangerous process gas compressors that neither allow process gas to enter the environment nor inert gas enters the human machine, such as compressors and natural gas compressors with high content of Z5 Sour gas>, ethylene compressor and propylene compressor, etc.

The selection procedure of gas film seal is shown in Figure 4~5.

Figure 4-5 Selection procedure of gas film seal

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