 FEATURE


Peristalic pump is perfect for handling lime


A water purification plant in Malaysia was experiencing significant problems when handling lime chemical as part of its treatment process


P


reviously, the plant had solenoid metering pumps installed for the


dosing of the chemical. These pumps experienced difficulties due to the nature of the lime chemical, which has a tendency to ‘coat’ all areas of the pump, due to the lime particles falling out of suspension. As the fluid passes through the metering pump, the ball valves, small tubes and chambers begin to block which eventually causes a significant blockage and a rise in back pressure, resulting in seal failure. For every failure, inspection and service, the plant was losing many hours in downtime, expense of the labour and spares charges and the cost of clean-up. A local contractor was called in to solve


this problem and a move from solenoid metering pumps to Verderflex peristaltic hose pumps was recommended. The contractor and the local Verder team worked together to deliver a presentation


of data, reference sites and operational practices to demonstrate the quality and success of the pumps in other installations. Key benefits of a Verderflex peristaltic


pump in this application includes: • Abrasive and viscous handling capabilities.


• The constant compression and relaxation of the flexible hose which prevents the lime coating the flow path. • Quick and easy to service as there is


just a simple hose and lubricant change to perform. • The constant revolution of the rotor


assembly delivers a flow rate proportionate to the rpm which results in an accurate delivery of chemical which can be easily controlled through an inverter and, if necessary, an analytical probe. The installation of four Dura 35 pumps


(35mm hose ID) has improved the dosing process. The pumps are now operating for


a consistent and unbroken period with only a planned inspection and maintenance procedure necessary. The expenditure on service contractors has been reduced with no loss of quality to the dosing process. The engineering team at the facility


has specified the Verderhus screw- channel centrifugal pump for circulating the lime chemical within the holding tanks, which maintains the homogeneity of the suspension. This has an exponentially beneficial effect of reducing the cleaning of the tank due to sedimentation and prevents the pump from having to work as hard. By choosing the Verderhus screw- channel, the purification plant has the perfect pump for handling a high flow rate of a viscous, yet flowable slurry. Thanks to its open impeller and helical, corkscrew- like impeller, the Verderhus excels at the efficient passage of lime slurry with a BEP in excess of 70%. The pump is insensitive to clogging and changes in viscosity. The customer gains the benefits of a positive displacement pump in terms of the viscosity handling and the benefits of a centrifugal pump for larger flows.


Verder www.verder.co.uk T: 01924 221 001


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