Specifications include, but are not limited to: The recoating of the sludge thickeners includes the steel scum baffle, steel rake arm, steel skimmer arm, steel scum trough, steel center baffle, steel center support structure, steel center drive mechanism, steel rake arm support structure and steel catwalk. The two sludge thickeners are 35 feet in diameter with a side wall depth of 10 feet and a bottom slope of 2-3/4 inches per foot. The aluminum domes which cover each sludge thickener are not to be recoated. The major components of steel work associated with the thickeners to be recoated are listed below. However, this list is not inclusive of all the steel work which shall be recoated under this specification as there are several appurtenances, brackets, flapper valves, scrapers and other miscellaneous small items which have not been specifically identified that shall also be recoated. Metalwork for recoating for each Sludge Thickener (including, but not limited to the following): Scum baffle is approximately 33.5 ft. diameter - 12" × 1/4" plate Catwalk support beams are approximately 36 ft. 8", a 16" web 7" flange with ties between the two beams. Scum trough is approximately 6ft. 6" × 3 ft. × 1 ft. 3" (L × W × H) Skimmer arm is approximately 15 ft. 9" long × 8" wide × 5" deep box tube support with attached skimmer plate 15 ft. × 6" × 1/4" Rake arm truss is approximately 32 ft. 10" long – 7 ft. at center tapering to 3 ft. at both ends.
