Product category:
Potable water, test and treatment
News Release from: Watson-Marlow Bredel Pumps | Subject: SPX15 and SPX25 at Buckton Castle WTW
Edited by the Processingtalk Editorial
Team on 08 September 2006
Peristaltics neutralise the pH problem
at a WTW
Installation of Watson-Marlow Bredel pumps at Buckton Castle WTW has overcome the previous blockage problems when dosing the viscous lime slurry used to maintain a neutral pH
The viscous lime slurry used to maintain a neutral pH during the water treatment process was causing frequent blockages in the diaphragm pumps used by Buckton Castle WTW However, the installation of two peristaltic hose pumps supplied by Watson-Marlow Bredel has overcome this problem, substantially reducing both the time and cost of maintenance required
This article was originally published on Processingtalk on 10 Jun 2008 at 8.00am (UK)
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Buckton Castle Water Treatment Works (WTW), based in Mossley, near Manchester, supplies up to 50 megalitres of water a day to over 120,000 people in the Tame Valley.
The water is supplied to the site from reservoirs in the Greenfield and Swineshaw Valleys.
During the water treatment process, lime slurry is added to the water supply at several points in the system in order to maintain the required pH level.
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The alkaline solution is added firstly during the coagulation process, which causes unwanted particles in the water to stick together so that they can be extracted from the solution.
Further along the system, lime slurry is again dosed into the water, to correct the pH during two stages of filtration before it enters supply pipelines.
Buckton Castle had been using diaphragm pumps to achieve this dosage, yet at low flow rates the pumps frequently became blocked with the viscous slurry, causing maintenance problems and increased down-time.
However, when the diaphragm pumps were replaced with peristaltic pumps supplied by Watson-Marlow Bredel, blockages were no longer a problem.
In peristaltic pumps, liquid is drawn into a tube and pushed through it by the action of rollers.
Because nothing but the tube is ever in contact with the fluid, there is no risk of the fluid contaminating the pump, or of the pump contaminating the fluid.
If product should enter the pump casing, it will not cause a problem as the chamber level switch will stop the pump.
As the hose is the only wearing part, and can be replaced without dismantling the pump, maintenance is simple and low cost.
Buckton Castle WTW is currently using ten Watson-Marlow Bredel peristaltic pumps: SPX15 units (maximum flow 2.3gpm, discharge pressure 110 psi) and SPX25 units (maximum flow 11gpm, discharge pressure 232 psi).
These are both capable of pumping viscous and high density fluids, while the accuracy of the flow rate (+/-1%) makes them highly suitable for dosing applications.
Importantly for Buckton Castle, they are also fitted with camlock connectors, so that any problems can be fixed quickly and efficiently.
The SPX25 features an enhanced hose clamping and flange design, which significantly reduces the time to change the hose, and also improves the effectiveness of the sealing system.
Process Technician at Buckton Castle, Mike Whittam, says that the Watson-Marlow pumps are a great improvement for the treatment works: "I am an engineer by trade and have worked with Bredel pumps before.
I have always found them very easy to use and maintain, as they have a simple design.
This makes the whole process easier, particularly as the hoses connecting the pump to the system are made from reinforced flexible PVC.
Before, with the rigid diaphragm pumps, one small blockage would require a major strip down as we couldn't see where the problem was".
The design of Waton-Marlow Bredel peristaltic pumps prevents backflow, and means that no valves are required, significantly reducing blockages.
Accuracy of the delivered volume and flow rate are parameters which can be fully tailored through the size of the pump, the rotor speed and the tube diameter.
The pumps are fitted with a number of safety features including pressure relief switches which ensure any excess force is pumped back into the suction system to do a full circle and pressure sensors that will show if the system is running correctly. Request a free brochure from Watson-Marlow Bredel Pumps ...
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