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Digester No. 5 with Floating Cover
Corrosion and Loss of Section of the Cover Skirt at the Seam
Side View of Elevated Cover Showing Skirt after Corrosion Removal
Jacking Post inside Jacking Column Supporting the Lifted Cover
Corrosion and loss of section in the seams of the steel floating cover skirt had allowed methane gas to leak. To prevent distortion and unbalanced forces on the cover framing, K&H developed a scheme to uniformly raise the cover with hydraulic jacks connected to 22 jacking posts/cylinders. Once elevated above the tank, the skirt corrosion was removed and repairs implemented at the seams through welding and coating of new steel strip plates.
Howard F. Curren Digester No. 5 Floating Cover Rehabilitation
Tampa, FL
Greeley and Hansen
City of Tampa