For temporary buffering due to fluctuations in gas production or inoperable production systems or consumers a storage of the produced biogas is required. The holder is made up of two spherical shaped polymer membranes (other forms are also possible), lying one inside the other. The external membrane is maintained in a stable form with the use of an air blower. The external membrane then serves as protector for the inner membrane against the influence of environmental factors such as wind or snow. The biogas is contained within the inside polymer membrane. The pressure generated by the blower is transferred evenly over the inside membrane. This maintains a constant system pressure within the biogas reactor. Double membrane gasholders are available in various sizes, pressure classes and construction types. The design and specification of such systems is carried out according to the individual application requirements.

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