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.
Significant savings can be realized in new facilities since the Front End foundations for the bodymaker area can consist of only bodymaker foundations and a small housekeeping trench of only about 150mm width and similar depth.
For existing installations where bodymakers/trimmers are added it is not necessary to extend the large gravity return trench piping or to increase capacity of existing sump tank pumps which are located in the trench.
Low fluid shear is a characteristic of the pump used in the pumpback tank. Since the pumpback tank has significantly less fluid sheer than a typical single sump tank pump, tramp oil which is collected at the bodymaker is more easily removed at the coolant filter unit in order to maintain desired tramp oil percentages.
Roeslein™ will offer Coolant Filter systems with pumpback tanks rather than a traditional single large sump tank as a no cost option.
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