Product category:
Metering pumps and dosing systems
News Release from: Watson-Marlow Bredel Pumps | Subject: 620Di/RE
Edited by the Processingtalk Editorial
Team on 28 November 2007
Dosing pumps feed gas line repair fluids
Leading gas leakage repair system manufacturer, MW Polymers, is using peristaltic pump technology to achieve fast turnaround repairs delivering its revolutionary two-part polymer Ecoseal system
The peristaltic pumps have not only cut filling and handling time in half; they have also improved delivery accuracy and helped simplify the dispensing process MW Polymers has developed a niche yet robust market by providing a repair service to the 12 million joints that connect the gas distribution pipes beneath Britain's road network
This article was originally published on Processingtalk on 10 Jun 2008 at 8.00am (UK)
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Although established over 30 years ago, the recent MW Polymer Ecoseal innovation has pushed the company to the forefront of the industry.
"Today there is huge pressure on contractors to minimise the size of the road excavations required to undertake repairs," explains the company's managing director Michael Wild.
"With this in mind, 'keyhole' repair methodology has been developed over the past five years that entails a small hole being drilled down to the top of the main, through which Ecoseal can be used to provide a safe, permanent repair, saving huge amounts of money and time".
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However, MW Polymers found that sourcing a reliable, fast, accurate and economic method of pumping Ecoseal was easier said than done.
"In our experience piston pumps struggle when it comes to high viscosity products such as Ecoseal," continues Mr Wild: "Because we wanted to avoid contamination of the pumping mechanism we opted for a peristaltic pump, albeit a small capacity model".
Unfortunately for MW Polymers the pump was not quick enough at filling the twin-barrel cartridges that dispense the Ecoseal component parts.
What's more, the pump could only dispense one product at a time, which meant double handling.
Desperate for a better solution, the company contacted Watson-Marlow Bredel.
"The applications engineer from Watson-Marlow was very helpful," explains Mr Wild: "Firstly he suggested we increased the capacity of the persistalic pump, suggesting the Watson-Marlow 620Di/RE model, which is a dedicated dispensing pump that uses a single channel tube element pumphead.
He also suggested we use two pumps to reduce our handling time".
The Watson-Marlow Bredel 620 Series dispensing pumps are designed to deliver accurate, repeatable volumes with set dosing and interval times to suit the application.
The pumps can deliver up to 1080 litres/hour at up to 4 bar pressure through a chemical-resistant tube element.
In Watson-Marlow Bredel peristaltic pumps, nothing but the tube touches the fluid, eliminating the risk of the pump contaminating the fluid or the fluid contaminating the pump.
Fluid is drawn into the pumphead and trapped between the rollers and the track.
As the next roller moves forward, the pocket of fluid is expelled and more is drawn into the tube by the vacuum that is created.
The complete closure of the tube gives the pump its positive displacement action, preventing backflow and eliminating the need for check-valves when the pump is not running.
The pumps, which often run 24/7, are ideal for slurries, viscous, shear-sensitive and aggressive fluids.
They are easy to install, simple to operate and inexpensive to maintain, requiring only a disposable and quickly replaced tube: 620 LoadSure pumps use tube elements with industry standard Cam and Groove fittings.
"The 620 Series pumps have really hit the nail on the head," declares Mr Wild.
"Not only have they cut filling time from 20 seconds to 10 seconds, we can dispense both products at the same time, cutting our handling time in half".
The pump application at MW Polymers is far from straightforward.
Many pumps find it extremely difficult to pump two different materials (with different viscosities) into the same component at the same time.
For instance, one product might take 9 seconds to fill, while the other could take 12 seconds.
"The engineers at Watson-Marlow have been very helpful," concludes Mr Wild: "Following their guidance and training, our operators are now able to judge accurately how the liquids will dispense depending on the ambient temperatures at the time of repair.
Dispensing accuracy is now better than 1%". Request a free brochure from Watson-Marlow Bredel Pumps ...
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