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Denseveyor installed below a feed hopper
[P3674] Macawber Group Installation Case Study:
Sodium Bicarbonate Conveying system, Northwich, UK.

In brief:

The dense phase pneumatic conveying system was supplied to convey 14 t/h of sodium bicarbonate over a distance of 26 ft. horizontal and 98 ft. vertical. The system is an 8 cubic feet Denseveyor® with a 5” pipe line and is located under a feed hopper with start and stop controlled in automatic by the feed hopper and silo reception level probes. The system was first installed in November 1996.  In July 2014 after 17 years of continuous daily operation it was upgraded with a touch screen operator interface, new filling Dome Valve and air manifold. The vessel and pipe line remain originals and are in very good condition expected to offer many more years of service.  The pipe line, bends, and vessel are made from stainless steel 304 with all external surfaces coated in a corrosive resistant clear lacquer.

 

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Macawber has been awarded a substantial contract for conveying EAF Dust for a steel mill located in Arkansas. The order includes 28 Ashveyor systems and is expected to be in operation early 2016.

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AIChE is the world’s leading organization for chemical engineering professionals, with over 45,000 members from over 100 countries.

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Dense phase pneumatic conveying is best described as using the lowest attainable material velocities to ensure the majority of material remains below the saltation level. It is a simple, efficient, cost-effective and safe mode of transport particularly beneficial for handling difficult to convey materials.

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WG Denseveyor conveying malted barley

Denseveyor conveying malted barley

The Denseveyor is a low velocity dense-phase pneumatic conveying system using here a single pressure vessel to cyclically transfer 10T/hour Malted Barley for 280 ft as it is made available by gravity feed to the machine. The Denseveyor is filled by gravity through the special Dome® Valve and when the vessel is choke filled the valve closes through the material and seals closed to a pressure differential of 7 barg. The conveying air is applied to the pressure vessel in a special controlled method that allows the material to pass down the pipeline at a low velocity reducing material degradation.

 

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The three systems ready for delivery.

The Three Systems Ready For Delivery

 

Three dense-phase, low velocity pneumatic conveying systems were supplied to convey coal dust between 1.5t/h and 2.7t/h over a distance of 525ft horizontal and 30ft vertical. The systems were 2 x 3ft3 and a single 8 ft3 vessel all with a 3” convey pipe line. All pneumatic conveyors are located under a feed hopper with start and stop controlled automatically by the feed hopper and silo reception level probes. The material handling systems are working very reliably with no line blockages and exceed the customer’s expectation regarding transfer rate giving 2.9t/h for the smaller systems and 5.9t/h for the large system 1. The pipe line conveying pressure was between 8psi and 12.5psi. Convey air requirement was substantially less than that proposed at 88scfm and 180scfm. The proposed air requirement was 176scfm and 278scfm. The systems are pneumatic only to the ATEX equivalent of Eexd Class II Division 2. The customer elected to control the systems through their own high level PLC and DCS systems.

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pneumatic conveying of fish food pellets

Pneumatic Conveying of Fish Food Pellets

Two dense-phase pneumatic conveying systems were supplied to handle 35 tons per hour of Fish Food Pellets over a distance of 265 feet horizontal and 90 feet vertical. The systems were 30 cubic foot vessels with a 10 inch pipe line. Both systems were located under a feed hopper with start and stop controlled in automatic mode by the feed hopper and silo reception level probes.

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