Becker Mining South Africa’s PVS range of vortex pumps has been designed to efficiently pump sludge and slurries containing large abrasive solids and fibrous materials in light, medium and heavy service industries.
The PVS (pumpmor vertical spindle) range, which can handle solids of up to 72 mm and S.G’s (specific gravities) to 1,5, achieves up to 87 m heads at speeds of 2 950 rpm. These units are available in two and three-inch models, with a 0,7 m spindle length and single motor drive.
“The most important feature of these vertical pumps is the recessed, non-clog impeller design that prevents binding and clogging problems. Since the impeller is clear of the pump casing, any solids and fibrous materials that enter the suction inlet will be expelled through the pump discharge, without damaging the impeller,” says Theo Cambanis of Becker Mining South Africa.
“Another advantage of Becker’s pumps design is that spares are completely interchangeable. This reduces inventory management costs and simplifies on-site repairs. Because all components are locally manufactured, these pumps are readily available and a large stock holding of spares and raw materials ensures swift delivery throughout the country.”
The PVS series, with a one piece casing, has been designed to efficiently cope with all types of solids and fibrous materials. A locknut that fastens the impeller to the shaft prevents the impeller from turning off if the motor is started in the wrong rotation direction.
The pumps have a sleeve stuffing box clearance that minimises blow-back of materials being pumped around the shaft sleeve, without requiring sealing contact. A high-strength pipe column maintains alignment between the bearing frame and its casing. There are no submerged bearings on the cantilevered shaft.
Bearings have been selected for a minimum service life of 24 000 hours when operating at any point on the hydraulic coverage curve with 1,0 S.G. Grease lubrication is standard.
The pumps have a heavy duty construction, with chrome iron CR28% material, which has been hardened to withstand abrasive materials and for increased service life.