BoILERS, PUMPS & VALVES
although surface pumps are versatile in their uses, you must make a careful choice if your main dewatering objectives are to be optimally achieved. these machines vary considerably in the technology that equips each one for a different set of jobs and circumstances. here are five key considerations that will help you choose the right type of surface pump for your application.
3. sewage
Urban sewer system maintenance often requires pumping of sewage from one part of the system to another. In addition to this planned sewage bypass work, there are emergency situations where pumps are needed to remove effluents overflowing from sewers, treatment plants, sludge tanks or slurry pits. The increasing incidence of heavy rains and flooding is making this a regular occurrence. To pump liquid laden with such materials, your best
choice is a PAS dry prime pump. In addition to its strong pumping performance and ability to handle suspended solids, it provides the necessary robustness and serviceability for use in arduous duties. In particular, the portable models are designed with hinged-door service access. This allows easy opening of their casing, in the field, so that any accumulation of solids can be quickly cleared before restarting the unit.
4. Polluted soil
Surface pumps can play an important role in projects to remediate polluted soil as part of sanitation works. As well as removing contaminated groundwater for treatment, and stabilising the terrain, they can be used to dewater and dry pipelines. WEL wellpoint pumps are perfect for this kind of application, thanks to their ability to extract water from ground materials and shallow structures, despite the flow’s high air content.
5. other sPeCialised aPPliCations
The most common uses of surface pumps are summarised above, but there are many more specialised situations where they can be applied. Ballasting and de-ballasting of ships, for example, is another job for which PAS dry prime
pumps are ideal. It involves pumping sea water into and out of ballast tanks, during loading and offloading operations, to maintain the vessel’s trim, stability and structural integrity. The build quality and strong, reliable performance of these pumps is important here. A further application for wellpoint pumps is in dewatering onshore pipelines used to
transport crude oil or natural gas. This is essential to guarantee the quality of the hydrocarbons, prevent formation of hydrates and protect the pipeline from internal corrosion. The effectiveness of a WEL pump is invaluable in this task. Within the Atlas Copco surface pump ranges you will find a diverse collection of models
and options designed to meet very specific demands. For instance, the VAR wet prime range includes pumps specifically adapted for handling abrasive liquids and bentonite mud. Meanwhile, a recent addition to the WEL range combines vacuum and submersible pump technologies to achieve high flow with low energy consumption. Whatever your special need, just ask.
ConClusion In simple terms, if you are dealing with dirty and solid-laden water you need a dry prime (PAS) or wet prime (VAR) pump. Dry prime wins on fast performance and high efficiency, while wet prime scores especially well on portability and low maintenance. If you are extracting relatively clear groundwater, or completely dewatering a structure such as a pipeline, a wellpoint (WEL) pump is the answer. While this guide will direct you to the pump category best suited to your
application, precise matching of models and options to your circumstances will require further input. An Atlas Copco specialist will look at factors such as site location and conditions, solid content and particle size, and flow and lift requirements, before identifying the perfect pump.
atlas Copco
www.atlascopco.com
FACToRY&HANDLINGSoLUTIoNS | oCToBER 2021 63
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