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Borehole Pumps


Borehole Pumps Could Save An Arid Nation

When caught in one of Jozie’s torrential summer downpours with its spectacular sound and light display, it can be quite hard to recall that South Africa is, in fact, an arid nation and one that regularly experiences periods of drought that can extend over several years. Municipal water has become steadily more expensive with the need to import it from dams located in the neighbouring countries such as Lesotho where the catchment rates are far higher.

Once limited to farmland, boreholes and borehole pumps are becoming a far more common site in suburban South Africa today than in the past. The necessary expansion of arable land in an attempt to meet the increased demands of a rapidly growing population has also led to an increase in the sales of these units.

Since it is technically correct to refer to any narrow shaft that is drilled vertically into the ground or, for that matter, horizontally, regardless of its intended purpose, as a borehole, pumps supplied are often needed to transport a variety of other materials apart from water. These can include liquids such as petroleum as well as gasses such as the natural gas now widely used in cooking.

By sheer force of numbers, however, it is probably their use with water wells that accounts for most of the units in service today.

borehole-pumpsSiting and Drilling a Well

Drilling can be costly so an expert survey to locate suitable aquifers is vital before buying any borehole pumps. If water is required merely for irrigation purposes or for filling the swimming pool, a relatively shallow well should suffice but if the water is needed for drinking, deeper wells may prove to be less prone to surface contamination although some purification treatment may still be essential.

Although wells may be dug or driven, drilling remains the most efficient technique and is the method of choice. Preventing the walls of the well from collapsing is normally achieved by introducing a steel sleeve along with the drill.

Borehole pumps may be used fully submerged at the bottom of the shaft or, alternatively they may be mounted at the well head. The former usage will usually result in higher pressures and flow rates at the well head.

Rotary Action Gets Things Moving

Typically, the pumps used in these applications are of the centrifugal type. An impeller with numerous blades is rotated at speed and creates a pressure differential that serves to move fluid through the pumping chamber and into the well shaft for transport to the surface.

Borehole pumps used in very deep wells that could extend for close to 200 metres are likely to need the extra power of a multi-stage pump. These consist of a series of additional impellers in series and act like several pumps placed at intervals. The multi-stage arrangement serves to maintain the pumped water at the required pressure and flow rate even over the much greater distances involved.

Just how vital to our modern society are these wells and their hard-working borehole pumps today? The short answer is very! Water is a dwindling resource, not just in South Africa but all around the globe. Our dams are, all too often, only partially full and the national usage of water both for domestic and industrial purposes is growing daily.

Even in areas where the absence of visible surface water is quite evident, there may often be quite extensive aquifers not far below the surface with the capacity to meet many of our daily needs that, if tapped, could impact positively both on the economy and the ecology.

Drilling wells to supplement water supplies may be of vital importance in the not too distant future and it may be a very good idea to contact us for details of the high quality borehole pumps and service that have become our hallmark.

Written by Dan McCarthy

 


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