The Cologne Rand Canal is an almost twenty-kilometer concrete drainage route running along the Western suburbs of Cologne. The canal connects to the river Rhine and is mainly used for the drainage of water from a brown coal mine, excess rainwater and treated sewage.
More than fifty years after the construction of the canal, the cement base has become porous, causing water to drain away. The main contractor Weiss GmbH has been commissioned to make the base watertight by means of a special coating. During this work, the water is bypassed over a length of 750 meters through using a temporary pumping installation.
“More than 14,000 m3/hour with the motors at 55 Hz”
The temporary pump installation operates completely autonomously and consists of four frequency controlled electric BA400G D540 pumps which automatically speed up and slow down. Depending on the amount of incoming water, the vacuum-assisted 16″ inch pumps start up independently from each other.
“During a short period of heavy rainfall, we pumped more than 14,000 m3/hour with the motors at 55 Hz.”Bertus Rossing – Director of Buitenkamp Pompenverhuur B.V.