A slurry is defined as solids in liquid.
It is impossible to define when the quantity and size of the particles becomes too much for a mechanical seal because the design of some mechanical seals incorporate non-clogging seal features.
If the fluid you are pumping is a mixture of a liquid and a solid we have a useful formula to calculate the specific gravity of a slurry:
- Sm = Specific gravity of the mixture or slurry
- Sl = Specific gravity of the liquid phase
- SS = Specific gravity of the solids phase
- CW = Concentration of the solids by weight
The formula for the concentration of solids by weight (Cw ) is:
Here is an example of a typical mixture:
You have a water and solids slurry. The water is a liquid with a Specific Gravity of 1.0 and the % solids by weight is 30%. The solids having a Specific Gravity of 2.7, then:
- Speed limits for slurry pumps, S074
- Slurry pumps, S062
- Slurry sealing, SA010,
- Non clogging seal features, N008