Pumpback Tank explanation
Traditional coolant return systems require a large gravity return piping header to collect coolant from the bodymaker and trimmer. The gravity return header drains to a single sump tank typically of more than 2500 liters in capacity. Two pumps are mounted to the large sump tank for return of coolant to the Coolant Filtering unit.

A Pumpback tank consists of a small tank (about 75 liters) with a single small vertical pump which is located next to each bodymaker/trimmer pair. Since coolant is pumped overhead from the floor mounted pumpback tank directly to the Coolant Filtering unit, the trench mounted coolant return header and large sump tank are no longer required. In cases where overhead wet can conveyance is used, the large trench can be eliminated completely and replaced with only a small housekeeping trench.