Croston Engineering partners with DMN-WESTINGHOUSE for process speed & safety

25 September 2019UKPhilip Ripley

Croston Engineering has developed an innovative and economical answer to the problem of maintaining and monitoring a clean, dry air state in silos used for storing flour by using a DMN-WESTINGHOUSE SPTDS diverter valve and the existing silo intake pipe.

When storing flour and other similar products in bulk silos it is critical to maintain the condition of the air in the silo in order to prevent humidity which can lead to product degradation and contamination. Croston Engineering’s customer was using independent dehumidifiers that were mounted on the top of each silo to provide a constant supply of clean dry air. The installation of the dehumidifiers meant that important monitoring of the dehumidifiers performance and maintenance was difficult and time consuming.

Staff at Croston Engineering have extensive experience in designing bulk flour handling and pneumatic conveying systems. They identified a potential answer to the monitoring problem by using existing equipment and infrastructure and adding a pneumatic conveying diverter valve from DMN-WESTINGHOUSE.

The Croston Engineering design uses the fill pipe on each silo. A number of silos were involved which meant that work could start as soon as one silo was emptied. After the dehumidifier had been relocated to ground level, the fill pipe was parted to allow a connection to the dehumidifier. The DMN-WESTINGHOUSE ‘SPTDS’ Single Pipe Plug Diverter was installed in such a way that a constant supply of conditioned air could enter the silo through the existing tanker fill pipe. Now, when it’s time to refill the silo with flour, the SPTDS diverter diverts to the tanker and allows the efficient filling of the silo. After filling is completed, the diverter valve reverts to conditioned air from the dehumidifier.

The Croston Engineering system design together with the application of the DMN-WESTINGHOUSE diverter valve has provided an extremely efficient solution to the problem of monitoring and maintenance. This now takes a fraction of the time that it once did, and it is also a lot safer. Roger Croston of Croston Engineering said: “With any innovative idea, there will always be technical issues to overcome and this project was no exception. However, we were able to confidently rely on DMN and I doubt that any other company could have provided a better customer service.”

Philip Ripley of DMN-WESTINGHOUSE said: “This is another great example of DMN-WESTINGHOUSE working with a leading system specialist to optimise process design. Process efficiency and reliability sometimes come from the simplest of ideas.”

Contact : +31(0)252 361 800


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