In the present invention, there is provided a removable cover for retaining off gases inside a clarifier. The cover comprises trusses extending across the clarifier and a flexible sheet laid across the trusses. Structural angle s enclose the clarifier and constitute a kick plate on the walkways around the clarifier for improving the safety of workers. One side of the flexible shee t is permanently affixed to a first wall of the clarifier. A series of pulleys are mounted inside the structural angles for pulling and releasably sealing the three other sides of the flexible sheet against the outmost trusses and against a second wall of the clarifier opposite the first wall. Each pulley has a cable-deflector bar extending substantially at a same level as a mounting surface of the pulley for increasing an angle of downward pull on the flexible sheet. The flexible sheet is rolled-up along the trusses to expose machinery inside the clarifier.
申请公布号
CA2381602(C)
申请公布日期
2005.05.17
申请号
CA20022381602
申请日期
2002.04.12
申请人
HOWE, BRENT M.;DEGARIE, CLAUDE J.;MACLEAN, BRIAN R.
发明人
HOWE, BRENT M.;DEGARIE, CLAUDE J.;MACLEAN, BRIAN R.