Mechanical seal issue
Thread Content
Sea friends: The black liquor from paper mills contains particles, and multi-stage pumps with single-face silicon carbide mechanical seals are used for pumping it, but these seals wear out very quickly. Is there any good solution?
It contains particles; flushing it with a double-end face seal tape can **improve** the situation.
A single-face seal with both the stationary and rotating rings made of cemented carbide can be used, which should result in a much longer service life.
For the container type, change the single seal to a large spring, or switch to a double seal； For non-containerized types, the material pairing should be hard-to-hard. In fact, the original poster did not provide specific reasons; damage to the mechanical seal is not necessarily caused by the medium, and axial movement can also be a factor. When selecting a mechanical seal, it is necessary to take into account the amount of movement
Flushing the double-end face mechanical seal belt should work well
It’s a multi-stage pump; several silicon carbide single-seal units were replaced before, but they leaked very quickly.
This is mainly a problem with installation; if the surface finish of the shaft is damaged, this is the result. If it’s a new pump, I hope it won’t be like that.
Have you considered the amount of movement when changing the seal? How long has this multi-stage pump been in use? For new pumps, replace the rotating and stationary rings with cemented carbide; for old pumps, replace the entire pump. If the balancing device is severely worn and there is excessive play, a new seal will fail after just a few days of use
OP, I have two suggestions: 1. Select a new type of mechanical seal – it’s likely that you haven’t taken into account the issue of leakage； 2. Find out where the problem lies; it’s most likely a pump issue – the Sic isn’t that fragile