Tandem backup gas film mechanical seal-

Tandem backup gas film mechanical seal

　2018-10-18　　

Tandem backup gas film mechanical seal:

Tandem backup air film mechanical seal mainly refers to the arrangement of air film seal and contact mechanical seal in series. The inner mechanical seal is the main seal, and the outer air film seal is the spare seal. The structure is shown in Figure 4-14. Fill the space between the mechanical seal and the gas film seal-a clean buffer gas with a constant pressure (usually nitrogen, the pressure is lower than the pressure of the sealed medium. The gas film seal operates without contact to ensure that the main seal has a certain back pressure, which can effectively Reduce or even avoid the instability of the main seal caused by the vaporization of the liquid film between the main seal stack surface, which greatly extends the service life of the main seal. The process medium leaked by the main seal is discharged into the torch with the seal gas to ensure that the process medium does not flow Atmospheric leakage. Once the main seal fails, the gas film seal can play the role of the main seal in a short time and prevent the process medium from leaking to the atmosphere. This arrangement is suitable for light hydrocarbons, low-temperature volatile media, especially pumps Where the medium pressure is high. 210 mechanical seal

Figure 4-14 Tandem backup gas film seal

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