New Transalpine Railway (NEAT), Amsteg and Erstfeld construction sites
RL Pumpenanlagen GmbH, Wollerau
Incoming contaminated drainage water from the tunnels are guided to the collection basin of the sand press. This was initially done with standard commercial construction pumps, but the impellers were worn out after a very short time.
Four GPN3-80 Tsurumi mud pumps with agitator were used. This 4-pole jacket-cooled pump is designed for use in the harshest of mud environments, so that the impeller, agitators, and suction plates are fabricated of custom-coated chromium cast iron with a Brinell hardness of 415 to 425. After 6 months of use, almost no wear could be detected.