A gasholder beam digester cover can be used as a primary or secondary digester that requires varying volumes of gas storage.  It also allows varying levels of sludge (as compared to the fixed digester cover.)  The low friction slide guides are low maintenance compared to rolling guides. This cover does not require insulation because of a cushion of several feet of gas storage between the roof and the sludge.

 Ballast blocks are located at the bottom of the side skirt, these blocks are designed to set the mechanism’s operating pressure.



  • Has a higher insulation value
  • Allows variance in sludge volume
  • Allows varying gas storage for use in boilers (or other energy producing systems)


  • Will not depress scum
  • Less economical than a fixed beam digester cover
  • Some mixing systems are not compatible


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