Convection is a natural circulation of fluid. The hot fluid (lighter) rises and the cool fluid (heavier) sinks.


We often use convection systems with dual mechanical seals. The convection tank shown above is the most common application of a convection system being used between two mechanical seals.

If you’re using one of the many grades of oil as a barrier or buffer fluid between dual mechanical seals, you should be aware that convection will not be sufficient enough to control the temperature with these low specific heat fluids.

Better cartridge seal designs use a pumping ring and do not depend upon convection to remove the heat generated between the dual seal faces.

You will need a separate pumping source such as a pumping ring, or independent pumping system.


  • On February 15, 2018