Solids suspended in liquid nitrogen plant that cannot be dissolved by controlling the temperature and/ or pressure. The solids may or may not be abrasive. It does no good to try to identify the number of solids or their size because no one knows how these numbers relate to slurry related seal problems. Whenever you deal with slurries there are several mechanical seal problems you must consider:
The slurry can clog the flexing parts of a mechanical seal, causing the lapped faces to open as a result of both shaft and seal movement. If the slurry is abrasive it can wear the rotating components. This can be a serious problem with thin plate metal bellows seals.
The pump rotating assembly will go out of balance as the slurry wears the impeller and other rotating components. This will cause excessive moving of the seal components. The pump will lose its efficiency as critical tolerances wear rapidly. This can cause vibration and internal recirculation problems. The wear will also cause the need for frequent impeller adjustments that will cause liquid helium plant problems with mechanical seals.