Tandem seal

Tandem seal is Grundfos’ name for a shaft seal system, where an additional sealing chamber has been mounted on the existing shaft seal.

Tandem seal
Tandem seal is Grundfos’ name for a shaft seal system, where an additional sealing chamber has been mounted on the existing shaft seal. The purpose of the sealing chamber is to guarantee that liquid does not leak from the pump housing. By flushing the sealing chamber with a neutral fluid, excess fluid in the centrifugal pump is absorbed/removed.

Additional advantages
A Grundfos centrifugal pump with tandem seal offers several advantages. The flushing fluid between the two seals is pressure-less and gives several advantages to the product-side shaft seal such as:

  • No evaporation in the sealing gap. This prevents the formation of deposits as well as crystallisation on the flushed fluid side.
  • The flushed fluid lubricates and cools even when the pump runs dry or runs with vacuum.




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