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Our digester covers hold biogas under pressure to help in the anaerobic digestion process of wastewater sludge. The Spiral Guided Digester Gas Holder rotates as it travels up and down and is suited for larger applications, typically up to 110 feet in diameter, or where unbalancing loads are probable.
In the Spiral Guided Digester Gas Holder, rotation is accomplished by guides recessed in the rim skirt at a 45 degree angle which engage rollers mounted in the tank wall. The rotational travel of the spiral guided arrangement prevents the digester cover from jamming.
With unbalanced loads, rollers opposite each other act in pairs. As the gas holder tilts, one roller of the pair engages the upper side of the guide, while the opposite roller engages the lower side, causing the digester covers to attempt to rotate both clockwise and counter clockwise. This action occurs at each pair of rollers. The opposing forces result in a positive righting action which assures that the digester cover will not tip of bind under any operating conditions.
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