KSB
This firm recently delivered three specially designed, submersible borehole pumps (photo) for discharging crude oil from an underground rock cavern in Sweden. The three pumps are equipped with a 700 kW motor and are operated at a voltage of 6,600 V. The pumps are made of duplex stainless steel, and each has a flowrate of 2,000 m3/h. The head is approximately 80 m. Since the cavern is heated, the motors had to be equipped with an external cooling-water tube. Nevertheless, the pumps — including power cable and cooling-water tube — could still fit into the existing caisson pipes. — KSB AG, Frankenthal, Germany