Free passage

The dimension of the free passage usually refers to the largest spherical object that may pass through the impeller.

The dimension of the free passage usually refers to the largest spherical object that may pass through the impeller.

For small and medium-sized sewage pumps, a free passage of 80 mm is normally sufficient. Free passage for large pumps (above 100 l/s) should normally be at least 100 mm. The bigger the free passage, the lower the risk of clogging.





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