German pump manufacturer KSB has announced its new Amarex KRT range of submersible motor pumps featuring jacket-cooled drives, which are designed to transport untreated wastewater in municipal and industrial wastewater management.
The new pump sets are available with drive ratings from 10 to 30kW and are suitable for vertical and horizontal dry installation. As the pump motors remain operational when not submerged, the pump sets can also be used in sumps when water levels drop.
Featuring IP 68 enclosures, the pumps are able to operate continuously when flooded; they also meet all explosion protection requirements set out in ATEX, FM and CSA standards.
The pump’s motor is cooled via a closed circuit, which avoids contact between the circulating water-glycol mixture and the fluid being handled. This also avoids risk of contaminants in the fluid handled impairing the cooling of the motor.
The cooling liquid is circulated by an impeller that has been integrated into the cartridge seal. KSB’s proprietary double mechanical seal, which has been developed in-house for several years. When servicing is required, the cartridge can be replaced as a complete unit.
The pumps are able to transport fluids with a temperature of up to 40°C and operate in environments with a temperature of up to 55°C.
The sensor package installed as standard includes monitoring of the motor temperature via a PTC chain, a leakage sensor inside the motor and monitoring of the mechanical seal leakage via a float switch. Users can also order up to three Pt100 sensors for bearing temperature and motor temperature monitoring, as well as a vibration sensor.
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