100M SINGLE FLUE CHIMNEY REPAIRS & INSTALLATION TEMPORARY BYPASS STACK Hope Construction Materials
Issue: Following a detailed inspection, a partial failure of the internal refractory brick lining in the main chimney was observed. Due to financial concerns regarding lack of factory production, the client required a minimal shutdown period to carry out the demolition and replacement of the affected brick lining. Therefore, the main chimney required isolation to undertake the urgent work. Solution: Zenith’s world-class engineers working in conjunction with our highly skilled access and heavy lifting specialists, designed, fabricated and installed a temporary steel bypass stack complete with ducting, which was braced to the main chimney windshield. Once the bypass stack was safely jacked and lifted into position, and during a brief shutdown period, the existing flue entries were isolated and the new temporary flue entries were installed to divert the process gases into the new temporary bypass stack thereby allowing factory production to continue whilst the internal brickwork lining repairs were completed in the main chimney. On successful completion of the necessary lining repairs, another brief shutdown period allowed the temporary duct entries to be dismantled and the original flue entries to be reconnected to the main chimney. With the main chimney back in operation and factory production having quickly recommenced, the temporary bypass, structural bracing and temporary works access were dismantled.
Key Factors:
• Design and install all temporary works access including full circumference termination point scaffolding, winches and suspended platforms
• Design, fabricate and install main support steelwork and specialist heavy lifting jacking arrangement below the flue entry points with associated scaffolding
• Design, fabricate and install temporary lateral support bracings positioned to suit the prevailing wind direction
• Design, fabricate and install the temporary sectional 3.80m diameter bot- tom supported steel bypass stack and flue entries
• All the required extensive engineering, specialist access, heavy lifting re- quirements and mechanical services for the entire project were safely and successfully completed in-house utilising Zenith’s world-class, innovative industry leading capabilities.
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