Membrane material properties

Datasheet values for the documented 0.8 mm PE-LD membrane and 4000/4000 N/5 cm PVC-coated fabric. The large gas holder specifies a 6000N outer membrane; its properties are defined by the datasheet of the selected material.

PE-LD gas membrane, 0.8 mm

• Material: Low-density polyethylene, PE-LD
• Thickness: 0.8 mm
• Mass per unit area: Approx. 750 g/m²
• Tensile strength: 650 N/5 cm
• Methane permeation: 230 cm³/(m²·day) at 1 bar
• Temperature resistance: −30 to +70 °C
• Surface electrical resistance: >10¹¹ Ω
• Resistance: UV, weathering and liquid manure
• Fire behaviour in the datasheet: Not stated

PVC-coated fabric, 4000/4000 N/5 cm grade

• Material: Polyester fabric with PVC coating on both sides
• Thickness: Not stated in the source datasheet
• Mass per unit area: Approx. 920 g/m²
• Tensile strength: 4,000/4,000 N/5 cm
• Methane permeation: Not stated for this grade in the datasheet
• Temperature resistance: −30 to +70 °C
• Surface electrical resistance: >10¹¹ Ω
• Resistance: UV and weathering
• Fire behaviour in the datasheet: B1 — DIN 4102:1998; M2 — NF P 92-507:2004; B-s2,d0 — EN 13501-1+A1:2009

Outer membrane grade: 6000N — material designation in the large gas holder specification

• PE-LD inner gas membrane.
• Weather-resistant outer membrane made of PVC-coated polyester fabric.
• PE-LD bottom membrane and protective fleece.
• Double stainless-steel clamping profiles and enclosure anchoring hardware.
• External belt system, including an elastic PVC top element.
• ATEX blower sets, connecting pipes, spiral air ducts and air discharge components.
• Gas connections at the base and perforated extraction-protection pipes.
• Internal membrane calming system.
• Filling-level indicator with a 4–20 mA output.
• Connection flange for pressure measurement.
• Mechanical dry-type pressure relief valves and the required connection flanges.
• Round service opening with a double stainless-steel flange and zipper.
• Connection and sealing materials for the supplied assemblies, as listed in the final specification.

The quantity and size of each component are defined in the specification for the selected configuration.

Excluded

• Concrete foundation.
• Installation and on-site electrical connection.
• Packaging.
• Delivery.

Sizing the gas holder for the plant

The required storage volume is established from the difference between gas production and consumption over the operating cycle. The available gas buffer depends on the filling level and the operating range of the inner membrane. Storage capacity is therefore considered together with minimum and maximum gas flows, the consumer schedule and the control strategy. The nominal volume describes the selected model; the working inventory depends on the operating conditions.

The elongated geometry retains the same end sections and cross-section as capacity increases. Extending the central half-cylinder adds gas space, membrane surface and floor area. The straight foundation edges and their anchoring become longer, while the curved end sections retain their geometry. The project layout must allow for the complete footprint, access to service openings and the arrangement of gas and air connections.

Equipment is selected as a coordinated system. Supporting air maintains the outer membrane shape as the gas membrane moves; level measurement indicates the stored inventory; gas connections accommodate the specified inlet and withdrawal rates. Pressure protection is checked against these flows and the permitted pressure range. Larger duties are handled by increasing the number of the specified equipment units. Final quantities, connection positions and operating settings are recorded in the project specification.

Price list 2026

Price list 2026 in EUR, excluding VAT. Prices cover the gas holder materials and equipment. The concrete foundation, installation, packaging and delivery are excluded. The scope of supply is defined in the specification for the selected configuration.

Large-volume biogas storage

Large-volume membrane gas holders provide biogas storage for biogas plants, wastewater treatment facilities and industrial installations. A freestanding double-membrane gas holder creates a buffer between gas production and consumption. Stored biogas can be supplied to combined heat and power units or to gas treatment equipment for further use. The range comprises 19 nominal capacities from 13,000 to 100,000 m³.

The elongated gas holder combines two quarter-sphere end sections with a central half-cylinder. The base cross-section is 30 m wide and 15 m high. Additional storage volume is obtained by extending the central section while retaining the end geometry. Storage capacity can therefore be selected to suit the plant, available footprint and equipment layout.

The inner PE-LD membrane contains the biogas and moves as gas enters or leaves the holder. A PVC-coated polyester outer membrane provides weather protection and is supported by air pressure. A gas-tight membrane floor with protective fleece separates the gas enclosure from the foundation surface. The specifications include material data such as tensile strength, methane permeation through the polyethylene membrane and the temperature resistance of documented grades.

The gas holder package includes membranes, floor sealing, stainless-steel anchoring, an external belt system, ATEX blowers, air ducts, gas connections, filling-level measurement with a 4–20 mA signal, pressure protection and service openings. Higher required throughput is accommodated by increasing the quantity of the same equipment types. Selection takes account of gas inlet and withdrawal flow rates, operating pressure, climatic loads and electrical supply.

The 2026 price list covers the complete nominal range in euros excluding VAT. Prices include gas holder materials and equipment; the concrete foundation, installation, packaging and delivery are excluded. Compare storage volumes, membrane properties and scope of supply to select a configuration for your biogas installation. Provide the required capacity, gas flow rates and site dimensions for project selection.