Monoflo 380 pages

viining & Minerais Application Data No. 38 01/97 Make Mine A Monoflo Monoflo has designed and constructed a complte mine de-watering system to cope with highly abrasive liquid at a uranium mine in Niger, West Africa. Pump: Industrial progressing cavity pumps Product: Water Capacity: Up to 40m3/h / 176gpm per pump Pressure: 40 bar / 580 psi Pump speed: 406 rpm Drive: Fixed speed gearbox Prime mover: 75kw / 100hp motor Engineering company Krebs invited Monoflo to tender for the job at the Cominak owned Akouta mine in an effort to cut heavy maintenance costs caused by excessive wear to the installed centrifugal pumps, Additional expense was generated during operation of the centrifugal pump system, which pumped water in stages, each demanding a separate pumping station and holding tanks. The new $1/4 million system is built abround three cast iron, high pressure progressing cavity pumps. They are capable of transferring water from three 22 gallon capacity holding tanks at a rate of 176 gpm, at 580 psi pressure, 240m to the surface and a further 3km to a settling lagoon. Mono's scope of supply not only included the pumps but also three sets of holding tanks, all inter-connecting pipework and valve systems assembled onto the appropriate baseplate. Each element of the de-watering system was assembled prior to despatch and then dismantled and packed for shipment to Niger. The system will be re-assembled down the mine once all the individual items have been received. The system is designed to operate automatically and continuously if required and a number of pump protection devices have been built in to minimise repairs and downtime. These include remote over pressure relief valves, backed by high pressure switches, and low pressure switches to prevent damage should the system run dry. The construction of the pump successfully combats the effects of the abrasive mine water, which carries dust and stone particles in suspension up to 200 microns in size, and has an overall solids content of 0.5%. The pumps at Akouta, feature Mono's unique Flexishaft, which provides a single component link between the rotary motion of the drive shaft and the eccentric motion of the helical rotor. The reduced number of moving parts in the drive train eliminates wear and makes lubrication unnecessary. The simplicity of the Flexishaft drive, and consequently the overall pump design, means that the pump is easily dismantled and assembled when routine maintenance is required. To further reduce wear problems, the shaft and rotor have both been constructed in stainless steel, protected by ceramic coating, while the Flexishaft is made from a stainless steel material, covered with an abrasion and corrosion resistant coating. v-X^js/^y U K A S _001 Monflo Inc 9700 West Gulf Bank, Houston, Texas, USA T. +1 281 272 7700 E. inquire@monoflo.com www.monoflo.com Monoflo m One Company, Unlimited Solutions © Monoflo January 2009