Legra Africa is the sole agent and distributor of Legra Engineering. Legra’s expertise is in specialist pumping equipment, with the Legra Highwall Pumps and Legra Blasthole Pumps being unique products.
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The Highwall Pump is designed to have the main frame / power pack situated on top of the highwall edge, with the wet-end lowered over the pit wall and into the water accumulation on the pit floor.
The advantages of this pump format over conventional pit type pumps are:
By incorporating a second (booster) pump unit to the Highwall Pump, performance is improved to 100L/sec @ 200m head TDH. The booster pump is hard plumbed into the outlet of the primary pump, allowing for simple and efficient transferring of water at high head.
By utilizing a single pump unit to lift to 200m, operating of a single engine, all complexities of setting up staging pumps, including manoeuvring of a second unit, connecting pipe work, balancing performance, and monitoring both units is eliminated.
Mining Engineers are paid to plan ahead, planning for blast patterns is done months before actual blasting takes place. Ground water and rain is a natural phenomenon. ONE SHOWER OF RAIN CAN DOUBLE BLASTING COSTS OVERNIGHT. Not with a Legra dewatering pump – the results of rain and groundwater are overcome.
Legra Blast Hole Dewatering Pumps are extremely reliable and efficient in operation. All Legra wet ends are of multi-stage stainless steel construction, giving high performance over the life of the wet end. A non return valve is also an important feature of Legra wet ends, as it prevents water from re-entering the hole through the pump on reclaim. As the wet end is not required to run dry, life of the pump is further enhanced. Screening is stainless steel wedge wire type, and is available as a bottom mount, or full length option for areas where excess cuttings and mud are encountered in the base of the hole.
A series of shaped rollers carry the hose through the 90 degrees direction change off the reel, preventing the hose from flattening and assisting water delivery. All hoses used on Legra Pump Units are non-flattening, and hold their form while coiled on the reel, allowing the pump to give full performance at any depth.
The hydraulic oil entry and return lines to the wet end are carried inside the hose, and enters the hub via a twin port rotating gland, with a pressure rating of 5000 PSi on both ports. Tapered roller bearings handle the hydraulic thrust, and the gland supports the reel hub. The opposite side of the hub is supported by a single port rotary gland through which the pump discharges. This gland is also sealed for long life.
Extension & swing functions operate on antifriction bearings, limiting wear and negating the need for excessive greasing.
Pressure lines on all units are double braid with crimp type JIC hose fittings. Hydraulic relief pressure is set at 170 bar (2500 PSi) and all functions operate safety within this pressure range.
All units are sandblasted and painted in two pack urethane or powder coat prior to assembly.