Three construction procedures for concrete volute pumps
Wooden formwork is positioned at the site and the surrounding concrete is cast in two stages. The formwork can be reused several times and is easy to lift as well as to position. For large sizes, the investment costs are relatively low in comparison to other solutions. The concrete surface is resistant to brackish water or seawater.
The steel liner of the volute is used as permanent formwork. Depending on the size of the volute, the liner parts can be welded at the site. This option is an advantage with small pumps in small numbers. For seawater applications, however, we recommend a concrete volute liner.
The pump volute is split into a certain number of concrete blocks, which are cast in a concrete factory. The parts are then shipped to the site and assembled. The advantage is that the civil work at the site need not be particularly accurate. The volute surface is resistant to brackish water or seawater. For bigger sizes, however, we recommend an in-situ casting or steel liner because the prefabricated elements are limited in size and weight.