In petrochemical and oil refineries, there are many pumps that 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 may It works in the state of gas phase, vapor (gas) phase or vapor-liquid mixed phase. Because the normal pressure boiling point of these media is lower than the surrounding environment of general pumps, care must be taken not to make such seals run dry or work erratically. For this reason, Strong measures should be taken in terms of structure, auxiliary measures and working condition control, for example, strengthening 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; use fluid dynamic pressure The seal can make the seal work in a good lubricated state; the heating method can make the seal work in a stable gas phase state. In addition, a cascade mechanical seal can also be used.
Tungsten Carbide Inserts Manufacturer