Typical mechanical seal for easy gasification medium pump-

Typical mechanical seal for easy gasification medium pump

　2020-07-01　　

Typical mechanical seals for easy gasification medium pumps:

In petrochemical and oil refineries, many pumps work near the boiling point (bubble point) of the medium, such as light hydrocarbon pumps, liquefied gas pumps, liquid ammonia pumps, hot water pumps, etc. Therefore, the mechanical seals of these pumps have It may work in liquid phase, vapor (gas) phase or vapor-liquid mixed phase. Because the normal pressure boiling points of these media are lower than the surrounding environment of general pumps, care must be taken not to make such seals dry or work unstable. For this reason, strong measures should be taken in terms of structure, auxiliary measures and working conditions control. For example, strengthen flushing to ensure the pressure and temperature of the shaft seal box, so that the seal can work in a liquid phase or a liquid-like state; The hydrodynamic pressure seal can make the seal work in a good lubrication state; the heating method can make the seal work in a stable gas phase state. In addition, a cascade mechanical seal can be used.

The structure and characteristics of several common mechanical seals for easily vaporized medium pumps are described in Table 9-2.

Table 9-2 Several common mechanical seal structures and characteristics for pumps with easily vaporized media:

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The operating characteristics of the mechanical seal for the easy vaporization medium pump　　Mechanical seal for the solid particle medium pump