AB Cover

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Double membrane roof for biogas installations and other purposes

Page last modified

April 11 2024

The AB Cover is a innovative double membrane roof for storage of gas for biogas installations and other purposes. The cover consists of separately installed upper and lower membranes, which are manufactured from biaxial reinforced fabrics with a high-grade, chemically resistant PVC coating. AB Covers have an enormous gas storage capacity and are available for silos up to a diameter of approximately 40 metres. Operational pressures varying from 0 to 5 mbar and an under-pressure situation up to -1.5 mbar are no problem.

Pros & Limitations

Gas storage volume at ø 25m is about 230% larger than in conventional designs

Lower membrane foil has 35% lower gas permeability

Easy accessibility for maintenance and overhaul activities

Lower silo load due to hemispherical construction

Low wind sensitivity and lower chance of snow accumulation due to stable construction

No condensed, corrosive liquid on the silo walls

Local snow and wind conditions can be a limitation

Specification

Specification Title	Specification Description
Storage	Intallations for the storage of biogas.
Material	UV-resistant biaxial foil.
Maintenance	The AB Cover must be visually inspected at regular intervals.
Sizes	Up to a storage volume of 12.000 m³.
Dimensions	Diameters of up to Ø50 m.
Installation	Installation will be done by our own crew.
Environment	Solution for Alternative Energy / Green Energy.
Analysis	A static analysis is a standard part of each project.