Canadian Consulting Engineer

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Qdos 20 pump launched by Watson-Marlow Fluid Technology Group

New pump is suitable for applications at the well sites of smaller water treatment plants, where operators are often injecting into water lines at higher pressure.


pump

Qdos 20

The new Qdos 20 pump from Watson-Marlow Fluid Technology Group has been developed to offer highly accurate sodium hypochlorite metering in disinfection applications with flow rates to 32 gallons per hours at a maximum of 100 psi pressure.

It is especially suitable for applications at the well sites of smaller water treatment plants, where operators are often injecting into water lines at higher pressure.

The Qdos 20 is designed as a drop-in replacement for diaphragm pumps. Qdos pumps also include the ReNu pumphead for single, no-tools maintenance.

Its intuitive interface provides simple control of the pump via manual, 4-20mA, contact or PROFIBUS control.  The brushless DC motor control maintains flow accuracy of +/-1% with a repeatability of +/-0.5% and a turndown ratio of 3330:1.

The pump is suited for tight control for chlorine residual. Successful field trials and SCADA data indicate a considerable improvement in variation of chlorine residual compared to even the highest specification diaphragm metering pumps. This is achieved via the twin offset rotor design. 

The Qdos 20 peristaltic pump technology uses two tube channels; where the channels are operated out of phase.  Although peristaltic pumps are generally lower in pulsation than other positive displacement pumps, Qdos 20 reduces this pulsation even further by alternate tube compressions ensuring pulsation is balanced out.  This results in almost continual positive fluid displacement, and consistent metering of chemical into the application. 

Field trials have confirmed the long life of the pumphead, with one utilities customer in Minneapolis experiencing 12 months pumphead life. When operating up to 100 psi, the Qdos 20 pump also significantly reduced maintenance downtime. As a result, the plant is currently in the process of replacing the trial model with a production unit.

www.watson-marlow.com


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