man in blue with helmet

Rental solution with Aerzen compressors for a 300m tunnel

2MW compressor technology immediately available through Aerzen Rental


Sometimes water ingress can really put a building site under pressure. Literally and figuratively. Fortunately, with the right compressor technology you can quickly bring the situation under control. Pressluft Frankfurt Drucklufttechnik GmbH identified Aerzen Rental as the best partner for its project in Karlsruhe.

Ruling out water ingress

An underground tram tunnel is being built between Ettlinger Tor and Marktplatz in Karlsruhe. Running through the city centre, the tunnel is around 300 metres long all told. The geology of the area meant there was a risk of water ingress. The deeper the tunnel, the higher the groundwater pressure.

BeMo Tunneling GmbH had to use pouring concrete to stabilise the walls. But the pores were so large that, without the correct counterpressure, the groundwater could stream through the walls. That meant the pressure range in the first phase of construction was 0.75 to 0.85 bar, so the German regulations for work involving compressed air had to be followed.

Space-saving solution

The four compressors that were originally installed could not be relied upon to do the job. A new solution was needed that could be implemented fast. Pressluft Frankfurt Drucklufttechnik GmbH identified Aerzen Rental as the best partner.

To save space, eight CVO4400 units, each with a 250kW motor, were combined into two-storey units. The compressors were hooked up to water coolers that bring the air outlet temperature down from 120°C to 20°C. As Peter Engelke, project manager at Pressluft Frankfurt explains, “In cases like this you have to find an efficient solution fast. The three companies work together in a flexible and very professional way.”

For special applications it can sometimes be more economical to rent compressor packages rather than buying them.

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