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Coal fired power plants produce large volumes of fly ash at temperatures to 200°F from Bag Houses and Electro Static Precipitators (ESP). Rates of up to 50 tons/hour from a multi field fly ash collector require reliable transfer 24 hours per day for three years between boiler maintenance periods.

Large ESP units with up to 60 feed points from 5 fields are not unususal for an ash rate to 60 tons/hour depending on coal ash quality. Here the well established Ashveyor® system provides the economy and reliability required for this service.

In addition Economisers require very hot ash to be handled at temperatures to 350°C. In this application the Ashveyor® system uses the water-cooled Dome Valve® for reliable operations.

Conveying distances may be long to central storage silos for out-loading and distances of 2000 meters at the rate of >100 tons/hour are achieved with the Macpump® group of conveying systems.


Both the Denseveyor® and the Variflo® groups are used for single feed point transfer requirements with numerous installations in most coal burning countries of the world.

Power Utilities Using Macawber Technology
Ontario Hydro Alabama Power Company West Heating Plant Central Heating Plant
Shanghai Coke and Gas Wisconsin Electric Power
HaiFeng-Liaoning
Sierra Pacific Power Company Cottam Power Station
HaiFeng-Liaoning PDL/Koblitz  


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