The fire brigade uses submersible pumps as part of the technical assistance. In high-water applications, submersible pumps and turbine submersible pumps are generally used. They have largely replaced the classic water pump which uses a jet.
Submersible pumps are electrically operated. Depending on the delivery rate, a distinction is made between types TP 4/1, TP 8/1 or TP 15/1 with a delivery rate of 400, 800 or 1,500 liters of water per minute at one bar pressure. As disposals, B or C Storz couplings are used.
In contract, turbine submersible pumps are driven by motive water, which is pumped by pressure from a fire pump into the turbine submersible pump and drives the turbine wheel. Since is had separate outlets for motive and waste water in contrast to a water jet pump, operation in the circuit fire pump – turbine submersible pump – fire pump is possible. The dirty water is discharged through another outlet.
A really special application for submersible pumps is the use in extinguishing water wells if the water level is so deep that the geodetic suction height would be exceeded and a withdrawal by fire extinguisher pump would not be possible.
As a rule, submersible pumps are not used for the extraction of extinguishing water, as the extinguishing water flow might not be sufficient. In special, but rare cases, for example, if the geodetic suction height for normal fire-extinguishing centrifugal pumps is too high or the suction line is too short, they are nevertheless used. A few fire departments generally use submersible pumps to extract extinguishing water from open waters, but this is rather the exception than the rule. For the removal of large extinguishing water streams, eg. For example, in industrial fires, fire pumps and floating pump systems such as the “Hytrans Fire System” HFS) are used.