Selection of pumps and mechanical seal leakage
Thread Content
Recently, a process has been used that involves plate and frame filter presses and precision filters; centrifugal pumps have also been introduced, with a head of 32 meters, an inlet diameter of 50 mm, an outlet diameter of 40 mm, and an operating temperature of 90 degrees. The material transfer speed is relatively slow after passing through the plate and frame filter; this is likely due to the high resistance posed by those components. The machine seal leaks frequently; trying to lower the temperature can extend its operational time, but leakage still occurs. After replacing it with a magnetic pump, the problem of slow material transfer time was resolved; the transfer time is now twice as fast as before. Do any friends have any good ways to solve the problems of material transfer speed and seal leakage? Waiting for help. . . . . .
What type of sealing is used? Is it sealed with a double-end face seal? Can a magnetic pump be used for feeding a plate and frame filter press?
Centrifugal pumps use single-face mechanical seals. Magnetic pumps can be used, but the material transfer speed is severely limited
It is recommended to try a pneumatic diaphragm pump.
Pneumatic diaphragm pumps are widely used, but they have never been used in filter presses; I think they wouldn’t work for that purpose!
This cannot be generalized; steel plant wastewater treatment systems are designed with frame filter presses, it’s just that the temperature is not that high, and PVC material is used in such systems.
You can try a high-pressure metal magnetic pump with a sealless design, which eliminates the problem of seal leakage; it depends on the medium you are pumping!
There is no problem with either of these pumps. When the temperature of the medium is high, the flushing procedure for the centrifugal pump is very important, as it affects both the lifespan of the mechanical seal and its sealing performance. Magnetic pump eliminates the worry of leaks, but it’s important to choose the right one – it won’t be slow!
For this filter press feed pump, a packing seal is sufficient.