Reinforced Concrete - FRP Flues    Progress Energy and Fluor Construction tapped CDI to design and build a 328' tall dual flue reinforced concrete chimney for their 'Clean Smokestacks' project at the Asheville Steam Electric Plant in North Carolina.  This facility became one of the very first new generation FGD wet scrubber systems to come on line when it began operation in November of 2005.

Reinforced Concrete - Dry FGD    This 550' tall reinforced concrete chimney highlights Hitachi America's new coal fired power plant project for Mid-American Energy in Council Bluffs, Iowa. Using traditional jump form construction methods. CDI built this chimney to house a single 24'-8" ID insulated carbon steel liner. The stainless steel roof cap was set in place with the use of a helicopter.

Three (3) 310' Grouped Stacks    CDI responded to the design and construction challenges posed by these three stacks grouped in a row by overseeing the most sophisticated wind tunnel testing program ever performed for stack analysis.  The results confirmed the effectiveness of CDI's dual wall design during this chaotic wind condition.  Over one thousand tons of steel were built in place at Manchester Street Station in Providence, Rhode Island.  The largest steel stack project of its kind ever built.

International - Slip Formed Concrete    Utilizing slipform technology, Commonwealth Power Group (Thai) Ltd. erected these two 100 meter tall reinforced concrete stacks in Thailand for a multi-national power development group led by Black & Veatch and Marubeni Corporation.  CDI's expatriate construction management team worked with local subcontractors to build these stacks to exacting ACI and AWS standars.

Dual Wall Sulphur Recovery Stack    CDI's dual wall stack concept has proven to be the best solution on sulphur recovery units like this 295' tail gas stack built at Shell Canada's Oil Sands Project in northern Alberta.  Severe ambient temperatures (-40 degrees F) can be isolated from the elevated flue gas temperatures, insuring a more stable and predictable life for the structure.  This stack was shipped to the site and erected in one piece.  The stack was lifted from specially designed transporters into place in one day.

CT Exhaust Stacks with Silencers    These three 100' stacks service ABB GT 11 N2 combustion gas turbines at FirstEnergy's Richland Power Plant in Defiance, Ohio.  Equipped with internal acoustic baffles to achieve the specified sound level criteria, these units were completely designed and built under the control of Commonwealth Dynamics, Inc.