One of the towns on the river Weser in north-western Germany needed a high performance mobile pump with adjustable speed in the event of flooding. The town has a population of more than 30,000 with a town center which can be cordoned off by aqua barriers in the event of flooding. However, at one crucial point a pump is needed to pump the water out of a reservoir. The town's priority was to have a mobile pump which fulfilled a number of individual requirements.
A Börger mobile unit with a Boerger EL 1550 Rotary Lobe Pump was selected. Key to the decision was that the complete mobile unit would be entirely built by Börger GmbH from the trailer, to the rotary lobe pump to the control unit. The rotary lobe pump is driven by a helical gear unit and mounted on a tandem axle with grid base. The speed of the pump can be adjusted. A switch in the control cabinet enables manual or automatic speed control.
If the speed control is set to manual, the speed of the pump can be adjusted by hand using a potentiometer. The control unit is fitted with a pressure probe. This is placed in the reservoir to measure the pressure and therefore the quantity of the liquid contained in the reservoir. In automatic mode, the speed of the pump is regulated with a frequency converter depending on the water level. Any frequency converter faults are indicated using control panel indicator lamps.
|Börger||Mobile Rotary Lobe Pump|
|Rated capacity||max. 550 m³/h (2.420 usgpm/h)|
|Pressure||1 bar (15 psi)|