Becker Mining recently delivered 28 Unipumps to a platinum mine in the Steelpoort area to be used for underground haulage dewatering. This contract, for the supply of 28 VS100-37 kW Unipumps, was delivered in three weeks, ahead of the required delivery date. These robust vertical spindle pumps, locally manufactured at Becker Mining’s Welkom operations to stringent quality specifications, have been developed for optimum efficiency, low maintenance, and extended service life in harsh operating conditions.
“Becker Mining’s Unipump durable pumps, which ensure highly efficient dewatering mine haulages, are designed to handle dirty water containing large abrasive solids and fibrous materials that many pumps are unable to cope with,” says senior general manager, Rick Jacobs. “Notable features include extreme dry run capabilities, abrasion resistance and a Spigot aligned design that requires no gaskets. These pumps have an easily adjustable impeller and pre-assembled bearing cartridges.”
“An important advantage of Becker’s pump design is that spares are interchangeable. This reduces inventory management costs and simplifies onsite repairs. Because all components are locally manufactured, these pumps are readily available and a large stockholding of spares and raw materials ensures swift delivery throughout the country.”
The Unipump is available in three sizes, 50, 80 and 100 mm. Each model has unique performance features and a combination of various motor speeds. Different impeller diameters give a midpoint pumping range of 160 m3/h and total heads up to 70 m. Because these pumps do not have a mechanical seal or packing gland, they can run dry indefinitely. Heads to 20 m at 40 m3/h can be achieved at speeds from 1450 rpm and heads to 60 m at 100 m3/h can be achieved at 3000 rpm. Open vein impeller pumps handle solids up to 12 mm in diameter and slurries up to 1,5 SG. Lower bearing lubrication is via a standard external grease nipple.
Unipumps do not have any external moving parts, which enhances safe installation. The depth to which they can be immersed is governed by the position of the bearing in the lower end of the upper column of the unit. The bearing is protected by a standard rotary seal, but for maximum reliability, Becker Mining specialists advise it should be kept above the water level and for ease of operation, the recommended maximum water level is marked on all pumps. The proposed sump installation is at a maximum immersion depth of 500 mm.
Durable construction materials have been carefully selected for reliability, safe operation and long service life. The wet ends comprise chrome iron 27% heat treated to 650 BN, and are also available in 316 stainless steel. Column assemblies are fabricated in mild steel as standard, and are also available in stainless steel.
Becker Mining’s Unipumps have been designed for effortless maintenance procedures. An easily replaceable polyurethane insert is fitted in the pump casing over the maximum wear area, while impeller adjustment is made without the use of spacers or shims. The upper bearing is greased for life, and does not require any maintenance.
Becker Mining South Africa employs a fully integrated ISO quality management system as part of its dedicated design, manufacturing, testing and repair facility. The company is also able to adjust its extensive range of pumps to suit specific customer requirements. The local Becker Mining team offers customised pump solutions, technical consultation, and project planning to mines throughout southern Africa.
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