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 to 72 mm (3 inches) 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, 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 robust 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.
These 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.
These pumps have a heavy duty construction, with chrome iron CR28% material, which has been hardened to withstand abrasive materials and for increased service life. When in its annealed state, it is 280-400 BHN, after undergoing heat treatment, it is 650-700 BHN. Other materials include cast iron and SS316.
Becker Mining South Africa employs a fully integrated ISO quality management system as part of a dedicated design, manufacturing, testing and repair facility. The company is also able to adjust its extensive range of pumps to suit specific requirements.