High Capacity Double Membrane Gas Holder With Customized Size And Automatic Control For Biogas Storage
Safe, scalable, and corrosion-free gas storage for biogas plants, wastewater facilities, and landfill gas recovery — engineered for the renewable energy era.
A double membrane gas holder is a flexible, gas-tight storage system used to hold biogas (or other low-pressure gases) above or adjacent to an anaerobic digester or gas tank. As the name suggests, it is built from two (sometimes three) concentric membrane layers made of durable, UV- and chemical-resistant technical fabrics.
Unlike rigid steel tanks that store gas under pressure, a double membrane gas holder stores gas at near-atmospheric pressure, using the weight and shape of the membrane itself to maintain a stable, controlled gas volume. The result is a lightweight, leak-resistant, and remarkably low-maintenance storage solution.
Common names: double membrane gas storage • membrane biogas holder • biogas gas holder / biogas dome • gas storage balloon • flexible membrane gas holder.
The system uses two separate membranes, each with a distinct job:
- Inner membrane (gas membrane): Forms the actual gas storage volume. As biogas flows in from the digester, the inner membrane inflates; as gas is drawn off, it deflates.
- Outer membrane (weather membrane): Encloses and protects the inner membrane from wind, rain, snow, and UV. A small constant air pressure in the gap (the "air chamber") keeps the outer membrane rigid and stable.
- Gas never contacts the outside environment → minimal leakage and odor
- The air chamber isolates stored gas from weather loads → stable pressure
- No moving mechanical seals → fewer failure points
A pressure control system (blower + relief valves) keeps everything within a safe operating window — typically just a few millibars, perfect for sensitive downstream biogas equipment.
- Superior gas tightness: Welded seams achieve extremely low leakage rates, protecting the environment and your revenue.
- Cost-effective vs. steel: Fabric construction is lighter and cheaper to transport and install, especially for large volumes.
- Corrosion-free by design: Technical membrane fabrics don't rust like steel — longer life, lower upkeep.
- Flexible capacity: Expands and contracts with daily gas production, smoothing generation vs. demand.
- Fast, simple installation: Prefabricated lightweight panels; no heavy cranes or on-site welding of giant shells.
- Excellent safety profile: Near-atmospheric operation means far less stored energy than a pressurized vessel.
- Weather & UV resistance: Engineered for decades of sun, wind, and freeze-thaw; optional snow/hurricane ratings.
| Feature | Double Membrane Gas Holder | Traditional Steel Gasholder |
|---|---|---|
| Weight | Very light (fabric) | Heavy (tons of steel) |
| Corrosion | Immune to rust | Requires coatings, repainting |
| Installation | Fast, crane-light | Slow, welding-heavy |
| Pressure | Near-atmospheric, stable | Higher, needs pressure vessels |
| Upfront cost | Lower | Higher |
| Maintenance | Low | Moderate to high |
| Best for | Large biogas volumes | High-pressure / special cases |
Bottom line: For the vast majority of biogas, landfill, and agricultural applications, the double membrane gas holder wins on cost, safety, and lifespan.
- Biogas plants: Stabilizing gas from anaerobic digestion of agricultural and food waste.
- Wastewater treatment: Covering digesters and storing digested biogas for CHP or grid injection.
- Landfill gas recovery: Storing collected methane before flare or utilization.
- Agriculture & dairy: On-farm digesters turning manure into energy.
- Industrial & food: Capturing process gases for reuse.
- Municipal waste: Integrated into waste-to-energy systems.
- Outer membrane: High-strength polyester with PVC/PVDF coating, UV-stabilized, anti-fungal treated.
- Inner membrane: Gas-tight, biogas-resistant fabric with HF welded seams.
- Anchoring: Steel clamping rings and concrete foundations distribute loads safely.
- Optional 3rd membrane: Added protection layer for aggressive or high-purity gas.
- Storage volume (m³) — based on daily gas yield and required buffer.
- Operating pressure (mbar) — match to downstream equipment.
- Gas composition — H₂S and moisture drive material choice.
- Site conditions — wind speed, snow load, seismic zone.
- Integration — roof-mounted, tank-top, or ground-based.
Installation: foundation → anchor ring → inner membrane → outer membrane → blower & control panel → leak-pressure test. Most systems are operational within days. Maintenance is light: periodic seam/anchor inspection, blower & sensor checks, occasional cleaning — no repainting, no rust battles.
Double membrane gas holders deliver a lower total cost of ownership than steel alternatives thanks to cheaper install and minimal maintenance. Always compare lifetime cost, not just the upfront quote.
What is a double membrane gas holder used for?
It stores biogas and other low-pressure gases safely at near-atmospheric pressure, commonly at biogas plants, wastewater facilities, and landfill gas sites.
How long does a double membrane gas holder last?
With quality membranes and proper maintenance, service life typically ranges from 15 to 20+ years, depending on UV exposure and gas conditions.
Is a double membrane gas holder safe?
Yes. Because it operates at near-atmospheric pressure, stored energy is minimal, and the gas is fully enclosed — making it inherently safer than pressurized steel vessels.
Double membrane gas holder vs. steel tank — which is better?
For most biogas volumes, the membrane holder is cheaper, lighter, corrosion-free, and faster to install. Steel remains relevant only for specialized high-pressure needs.
Can it handle harsh weather?
Modern membranes are engineered for high wind, snow load, and UV. Site-specific ratings (e.g., hurricane- or snow-rated) are available.
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