Floating Covers
remain in contact with the sludge, reducing the exposed liquid surface area and preventing a large scum blanket. This type of cover allows for variable sludge storage capacity and increased operator flexibility during sludge additions/ withdrawals when compared to fixed covers.

Modern floating covers incorporate the truss design since beam floating covers have a high center of mass and are, therefore, often unstable. Internal gas pressure, which is necessary to operate gas handling equipment downstream, is created due to the cover weight and additional ballast. The lower chord of the floating truss cover is sloped to convey gas to the center of the dome for withdrawal.

BENEFITS
• Best option for high liquid level variability
• Truss design increases stability of cover
• Attic space provides natural insulation