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Process Equipment Update


Fig. 1. High resistance to chemical attack enables cost-effective, precise pumping and a long service life.


 If your pumping application involves aggressive fluids, but at the same time costs have to be cut and production expanded, then peristaltic pumps offer an economical solution. Sean Ottewell reports.


 Wenn aggressive Fluide zu fördern sind, zugleich aber Kosten in die Schranken gewiesen werden sollen und die Produktion gesteigert werden soll, bieten peristaltische Pumpen eine wirtschaftliche Lösung. Ein Bericht von Sean Ottewell.


 Si votre application de pompage implique des fluides agressifs, mais que vous cherchez à réduire vos coûts tout en développant votre production, alors les pompes péristaltiques offrent une solution économique. Sean Ottewell rapporte.


Aggressive fluids meet their match with peristaltic pumps


pump from Watson-Marlow Pumps to help process aggressive wastewater fluids produced by various plating and galvanising processes at its sites. In Eindhoven, eight flexible production


A


lines run 24 hours a day, with processes such as electroplating silver, gold, copper and tin, electro- less nickel and synergetic coating, taking centre stage. AHC in Venlo has large, fully-automated lines and focuses primarily on technical and hard anodising, synergetic coatings, electro-less nickel on steel, as well as specific treatments such as chromic acid anodising, chromating and lacquering. AHC’s customers come from a range of sectors: everything from automotive, electronics and aerospace, through to pharmaceutical and food and beverage. “Running these continuous coating operations produces wastewater that needs to be treated


HC Benelux, a specialist in the provision of surface treatment technologies for engineering applications, has installed a series 521F/RC close-coupled peristaltic


before disposal in accordance with environmental regulations,” explains Luc Heldens, supervisor chemicals at AHC Benelux. “Both sites are certified to ISO 14001 and we take great pride in our green credentials. To prepare process wastewater for disposal, both hydrochloric acid and caustic soda are used to ensure pH is maintained at regulatory levels.”


Originally, an air-operated diaphragm


pump (AOD) was considered for the task, but as wastewater from production contains around 33 per cent acid chloride, solids in the acid would destroy the pump’s membrane. The AOD would also be unable to ensure accurate dosing of both hydrochloric acid and caustic soda - and this would cause unwanted fluctuations in the pH levels. The company initially worked with a competitor


supplier of peristaltic pumps but switched to Watson-Marlow because of problems with long delivery times. The first Watson-Marlow baseplate pump was installed many years ago. Now, having reached the end of its natural life after many


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