"Commonly used as a clean in place (CIP) return pump"

Self-priming pumps are specialized for air and gas contained products that cannot be pumped by general centrifugal pumps.

ADVANTAGES OF A SELF-PRIMING CIP RETURN PUMP

CLEANING COST REDUCTION:
REDUCE WATER AND CHEMICAL USAGE

When cleaning tanks with a CIP system, a self-priming CIP return pump is required. A CIP return pump must be capable of pumping a mixture of liquid and air, otherwise, it will easily become air locked. A standard centrifugal pump is not a good choice and if you are using it for this application you will not recover all of the cleaning solution which can waste chemicals and time.