Today, it boasts a range of products including submersible pumps, vertical turbine pumps, end suction pumps, horizontal split-case pumps, smart and digital dosing pumps, multi-stage in-line pumps, variable frequency drives (VFD), chemical feed as well as pressure boosting pumps. According to Venter, the company provides pumps for groundwater and surface water systems. “Groundwater serves primarily as a backup for surface water for cost reasons. It is much more expensive to use groundwater as it has to be pumped from deep aquifers. Increased pumping demand can cause aquifers to drop and ultimately run dry.” Despite this, the increasing trend is towards groundwater usage and wells are getting deeper and deeper. Venter says when selecting a pump the pump must match the irrigation system, that flow pressure is kept low and that proper controls are used. In its Irrigation Pump Handbook, Grundfos experts explain that different types of irrigation techniques place varied demands on how water is pumped from a source and distributed across a farm. Ultimately the goal is to supply an entire field uniformly using as little energy as possible. “Flow and pressure are important for any sprinkler system to get high uniformity,” says Venter. “To distribute an equal amount of water over the entire surface is vital for efficient use of water. A uniformity of 100% means that all the crops get the same amount of water. Water pressure, water flow and sprinkler spacing are required for proper irrigation uniformity. Two out of three of these parameters are pump
Bilfinger Intervalve Africa (Pty) Ltd. is one of the enterprises in Bilfinger Power Africa (Pty) Ltd., the South African subsidiary of German based Bilfinger SE. For years, we have been adding value to the power, mining, paper pulping and broader industry through comprehensive valve supply, valve maintenance and heat treatment solutions. www.intervalve.bilfinger.com
related.” He says VFDs on pumps save energy everywhere there is a need for variable flow and or pressure. “With more than one zone, where these zones have to be on and off at different time slots, the pumping need is varied. One pump with a VFD, for example, would be able to supply all three zones and still maintain a high pumping efficiency.” Other consideration Typically in the agricultural sector pumps for irrigation have been oversized. According to Venter, having the correct sized pump is crucial to the success of any irrigation system. The water source should also be considered not just from a depth point of view, but also the distance to fields are considerations. Furthermore, the performance of pumps must be regulated to ensure they are functioning at optimal pump design points. With a wide variety of products, available farmers are advised to call in a pumping expert to ensure that all the elements of the irrigation pumping system are aligned and integrated. Adding monitoring and control to the system only delivers further efficiency.
pump it ever created was a water pump.
According to Grundfos operating costs are generally lowered if the pump matches the irrigation system, if pressure is not higher than necessary and controls are used. It also ensures better irrigation that in turn delivers improved crop results which bode well for the success of any farmer. Grundfos South Africa (PTY) Ltd, +27 (0) 10 248 6000, email@example.com, www.grundfos.com
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Pipes, Pumps and Valves Africa - May/Jun 2021