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pipe couplings and expansion joints to deal with the expansion and contraction the conveying line would experience. The Tuf- Lok Therm-Line expansion joints included a special feature to reduce the coefficient of drag of the conveyed material, to improve conveying performance and reliability and reduce wear and energy requirements.

The Dynamic Air HDP 4000 long-distance fly ash and lime conveying systems are operating 24 hours a day, 365 days a year, to take the fly ash away from the new incinerating facility and deliver it from storage to truck load-out hoppers, as well as to convey lime and fly ash back to the new incineration facility for water treatment.

MCES was able bring their new incineration facility on-line as scheduled, and operate it reliably, in order to avoid the citation and extensive fines.

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Dynamic Air's HDP 4000 Full Line Concept dense phase pneumatic conveying systems convey fly ash 2200 feet from incinerators to storage silos

conveying systems for conveying fly ash over the 2200 foot distance inside the existing tunnel system. The HDP 4000 systems were chosen because of the low conveying line velocity, which reduces wear and tear on the conveying lines. These systems could use DC-5 Air Saver controls, which add greater control of the compressed air usage and provide added system reliability over the 2200 foot long conveying distance.

The Dynamic Air dense phase systems to convey the fly ash were easily able to utilise the existing tunnels because the conveying lines are compact and able to easily route around obstacles. Due to the need for redundancy, Dynamic Air provided two separate and parallel dense phase pneumatic conveying systems to deliver the fly ash from the new incineration facility to the existing fly ash storage silos. In addition to the long-distance fly ash conveying systems, MCES also specified the HDP 4000 conveying concept from Dynamic Air to replace some existing high wear dilute phase pneumatic conveying systems they were operating. The dilute phase systems were in their existing facility and conveyed the fly ash from the silo structure to an existing truck load-out hopper. Other HDP 4000 concept conveying systems were specified to convey lime and fly ash from the existing storage silos back 2200 feet through the same existing tunnel system to the new incineration facility for use in treatment of the waste water. Because the fly ash has to be conveyed from the new incinerators at a temperature of 350 degrees fahrenheit, and because the pneumatic conveying lines are 2200 feet long, Dynamic Air provided Tuf-Lok brand October 2011 • Solids & Bulk Handling 17

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