SATTLER Double membrane-gas storage - external
The traditional external gas storage for high gas pressures
Outer shell providing protection against climatic conditions
As in the case of an air hall, air is blown under the outer membrane of the gas storage by a support air blower. Thus, an overpressure is created within the support air space, keeping the form of the outer membrane stable. The ¾ spherical shape allows for high pressures and large volumes on restricted areas.
The outer membrane represents the building. It absorbs all external loads such as wind, snow and climatic conditions.
The actual gas storage is located inside and is thus protected against atmospheric conditions.
Inner shell for the storage of gas
Together with the floor membrane, the inner membrane forms the actual gas storage. They encase the gas chamber. The pressure in the support air space spreads to the biogas via the inner membrane. The inner membrane floats between the floor and the external membrane in different heights depending on the filling level.
The pressure inside the gas chamber is limited by the overpressure valve.
Measuring the filling level
The position of the inner membrane is measured by ultrasonic sensors or rope length measuring systems. These measured values can be transformed into filling level values and serve for the plant control.
Storage volume
The Sattler double membrane gas storage tank (DMGS) is currently available in standard sizes of 50m³ up to 5.360m³ but dimensions are not limited to that range.
Storage concepts for substantially larger storage volumes work according to the same principles, but use different geometries.
Working pressure
The spherical diameter has the greatest influence on the maximum working pressure of the storage. The smaller the diameter, the higher the max. permissible working pressure may be. A common value of the working pressure is approx. 20 mbar.
Membrane material
Membranes are made of polyester fabrics which are PVC-coated on both sides. Different membrane types are used depending on static requirements, statutory provisions and customer requirements.
