The SATTLER double membrane biogas storage tank consists of both an external membrane which forms the visible outer round contour of the tank and an internal and a bottom membrane to enclose the actual gas space.

A flame proof supporting air blower for explosive gas atmospheres regulates the variation between gas input and gas output, thus keeping the gas pressure inside the tank on a constant level. It also protects the external membrane against bad weather conditions. The volume of the gas space varies according to the quantity of gas flowing in and out the tank. A tube leads the supporting air to the highest point of the external membrane. The gas supply and discharge popes as well as the drainage for condensed water are hermetically sealed with the bottom membrane and fitted in the concrete foundations before the actual erection of the tank. The SATTLER double membrane biogas storage tank is then anchored to the concrete foundations by means of a three quarter anchorage ring. Special solutions tailored to meet customers' needs can be elaborated on request.

For the foundations that have to be prepared beforehand by building contractor we can offer the foundation plans the anchorage ring (bottom and collar bands), as well as the supply and exhaust pipes to the foundation rim. Once the foundations are finished, the SATTLER double membrane gas storage tank is mounted with its external, internal and bottom membranes, and the supporting air blower including air hose and safety valve. A level meter regulates the gas consumption. Additional accessories, like a gas booster blower, are available on request.

For the membranes which are welded together from spherical elements in a HF-welding procedure, highly tear-resistant polyester fabrics with a special PVC surface treatment and acrylate varnish are used. The maximum tensile strength of the PES fabric is tested according to DIN 53 354 and reaches in both the warp and weft direction a minimum of 5.000N/5 cm width of stripe. In addition, the fabric is highly flame-proof according to DIN 4102-B1. The special surface treatment formula guarantees a high UV and extraction resistance. The fabric is also resistant to the impact of the different biogas ingredients and the white color of its external membrane has a highly reflective effect. The construction and dimensions of the SATTTLER double membrane gas storage tank comply with all relevant standards. The tank is resistant against wind and heavy loads of snow and guarantees safe operation. The temperature resistant ranges from -30¢J to +60¢J.