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Flowmeter makes plastic fantastic
A
Krohne product story
Edited by the Manufacturingtalk editorial team
Oct 7, 2004
Capacitive electromagnetic flowmeters from Krohne have been installed by European Vinyls Corporation (EVC) to control accurately the manufacture of its Polyvinyl Chloride (PVC).
Capacitive electromagnetic flowmeters from Krohne have been installed by European Vinyls Corporation (EVC) to control accurately the mix of chemical ingredients used in the manufacture of its Polyvinyl Chloride (PVC) products.
Krohne's flowmeters enable the company to measure precisely the addition of chemicals used to initiate a reaction during the production of PVC.
This greater control over its 24 hour manufacturing process has enabled the company to improve product quality.
During manufacture, demineralised water is used to prepare the aqueous solution of chemicals which are pumped through stainless steel pipes and passed through the Krohne capacitive electromagnetic flowmeters and into large scale batch reactors where the PVC is formed.
Because of its low conductivity, accurately measuring solutions containing demineralised water is especially difficult and is not possible with standard electromagnetic flowmeters.
Krohne's capacitive electromagnetic flowmeters are particularly suited to this type of application because of their ability to measure liquids with electrical conductivity as low as 0.05uS/cm.
Production downtime at EVC has also been reduced as a result of installing Krohne's flowmeters.
Previously the company used mechanical positive displacement meters to measure the addition of chemicals but fine particles present within solutions would over time cause moving parts within the meters to stick.
Parts of the manufacturing process would then be stopped while the meters were cleaned.
Krohne's capacitive electromagnetic flowmeters have no moving parts and the electrodes used to sense product flow are captive in the wall of ceramic measuring tubes.
The device is therefore unaffected by any particles present within the substance being measured.
Signals from the flowmeters are fed to a distributed control system (DCS), which regulates valves that control the flow of chemicals into the batch reactors.
"We chose Krohne flowmeters because of their ability to measure accurately the aqueous solution we use in the manufacture of PVC," said Ken Hulme of EVC.
"This is a particularly specialist application and we needed a supplier that we were confident had the technology to meet our needs.".
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