Digestor Covers
ClearStream can provide various types of Digester Covers to fit your application and process needs. Below are the types of covers ClearStream can offer. If you need assistance in finding the right cover for your application, please complete the form below and we will get in contact with you.
Fixed Beam Radial Cover
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.
Buoyant Floating Truss Digstor Cover
A primary digester cover that is effective when sludge levels vary significantly, it is also very effective in conditions where extreme foam occurs. The ballast blocks are located in the attic space and are designed to set the operating pressure. The attic space provides insulation so additional insulation is not necessary.
A truss design is more expensive than comparable beam covers and the attic space collects condensation which will need to be removed periodically.
Gasholder Beam Radial Cover
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.
Gasholder Truss Digestor Cover
Similar to the radial beam gasholder digester cover; it is also effective when sludge levels vary significantly and allows for varying gas storage. The ballast blocks are located at the bottom of the framework and are designed to set the operating pressure. The attic space acts as the insulation so additional insulation is not necessary.
This truss design is the most expensive design and the attic space collects condensation which will need to be removed periodically.
Dual Membrane Covers
Costing less than half the price of a typical steel gasholder of the same capacity, these gasholders are increasingly becoming the normal method of containing and handling biogas.The gas storage systems are exclusively manufactured from advanced structural fabrics, and designed as membranes to provide both structural ( climatic ) stability and impermeable gas storage. No metals are used, except for the anchorage connecting the membranes to a concrete foundation slab.
The gasholders are provided with inflation fans and full instrumentation to measure and control the storage process. The membranes, unlike steel, are totally resistant to the acids inevitably formed during the biogas production process in the anaerobic digesters.