Water & Wastewater Treatment

The PumPing STaTion - PumP and ValVe SuPPlemenT 2017 11 In Depth: AODD Pumps The benefits and efficiencies of AODD pumps A ODD pumps are extraordinarily good 'all-rounders', finding applications in a wide range of industries, including construction, mining, electronics, chemicals and food processing. The pumps are self-priming so they can run dry without any damage and because they are powered entirely from compressed air, they are ideal for use in remote or hazardous locations, not to mention explosive environments. They require low amounts of maintenance and offer low cost of ownership, completing an attractive package. Pumping waste fluids The pumping of waste fluids is an Air Operated Double Diaphragm (AODD) pumps are an interesting seal-less, displacement alternative to centrigal pumps. Here we look at how they work and their potential benefits important requirement in a host of different industries and liquid waste can frequently contain varying amounts of solids, from sludge, slurries and solids in municipal and industrial waste applications, to slurries laden with rocks, pebbles and other particulates in the mining industry. Air Operated Double Diaphragm pumps triumph over other pump designs, such as those with close-fitting or rotating mechanisms where abrasive slurries can cause serious wear to functioning parts. As a result this can cause significant restoration costs and in many cases suspend productivity. Due to the size and make-up of AODD pumps, these issues rarely occur. Of course AODD pumps are not restricted to pumping waste containing solids; they are equally well suited to pumping other types of waste, including aggressive chemicals and even viscous fluids since the flow rate is directly proportional to the speed of the pump. For this type of application, AODD pumps differ from other pump types in that they automatically reduce the By David Rozee managing director Triark Pumps Fig 1: The principles behind AODD pumps

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