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The PFT Duo-Deck™, or exposed truss, digester cover design prevents the roof plate and structural components of the cover from coming in contact with the digester contents, thereby avoiding the related corrosive effects. This type of roof plate protection makes Duo-Deck the safest design for maintenance personnel after several years of traffic under the cover.
The basic Duo-Deck™ digester cover structure is similar to that of a floating cover except for an extended rim skirt and a concrete ballast ring that is placed around the bottom of the rim skirt. The ballast ring provides a pressure increase which activates waste gas burners and gas safety devices to release excess gas from the gas holder. It is best suited to less active secondary digester applications and to applications requiring lower gas operating pressures.
- Available in either vertical or spiral guided PFT® steel digester gas holders
- Scum submergence whenever digester gas storage is depleted
- Dry attic space for the protected location of insulation and ballast materials
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