The processing of finished concrete elements usually involves the use of clear or process water to cool drilling and sawing machines. If no tap line is available for this purpose, improvisation is key: A barrel with a pump is already enough. The manufacturer Tsurumi has developed a “miniature” pump for this scenario, the Family-12, which is as small as a football. Nevertheless, it has a lot to offer with only 100 watts of motor power, it manages 80 l/min, pumps up to two floors and does not even mind granular dirt (up to 6 mm diameter). This residue dewatering pump empties a water barrel completely, stopping only at a residual level of one millimeter. Since only moist whiff remains, the 3,400 gram pump even replaces the need for final drying with a cloth for example. Those who need more should consider the larger model LSC: also a residue dewatering pump, but providing 170 l/min and 11 m maximum delivery height. The more powerful model is also the basic equipment of many fire brigades: The technology has proven its worth, and there is no backflow of water even when the pump is lifted.
Concrete recycling water
Concrete recycling takes on a different dimension. This involves residual water contaminated with cement or concrete residues. These waters may contain grain sizes in the micrometer range but may also include crumbly lumps of concrete up to 30 mm in size. The larger pieces are sieved out in a water bath. The remaining residual water containing cement grains and other fine materials is used to rinse out truck mixers or is returned to the production process. Dewatering pumps with "concrete suitability" take over these tasks. At Tsurumi, there are three series: the KTZ, KRS and UZ, which are all well suited for “hard” recycling water. Among them is the frequently selected KRS2-80 for up to 100 m3/h flow capacity and almost 16 m maximum delivery head. The KRS2 series is particularly characterized by its powerful agitators at the intake opening to make media with a high solid content more fluid. A common design aspect is the absence of the cooling jacket. This is a characteristic feature of “concrete ready” pumps and is used to dissipate heat from the motor. Cooling jackets would wear quickly from the inside due to the abrasive particles in the pumped medium. Instead, the heat dissipation takes place via the large dimensioned housing of the submerged pump, which dissipates the heat to the surrounding medium. Nevertheless: Pumps with cooling jackets (such as the NKZ series from the above manufacturer) are also sometimes used - the specific task defines the model selection.
