Biogas Membrane Covers
High-Strength PVC & TPU Double-Membrane Covers for Biogas Storage Domes and Digesters
DERFLEX is a professional manufacturer of biogas membrane covers, engineered for high-performance gas storage domes, double-membrane biogas holders, agricultural digesters, and industrial methane storage systems. Our membranes are developed using premium PVC/TPU coated fabrics with exceptional gas-tightness, weather resistance, tensile strength, and long-term durability. Designed for global biogas projects, DERFLEX membranes ensure stable energy production, reduced maintenance cost, and reliable methane containment.
Overview of DERFLEX Biogas Membrane Covers
Biogas membrane covers (also known as double-membrane gas holders or digester covers) play a crucial role in biogas production systems. These advanced structures typically consist of:
- Outer Membrane – provides structural strength, weather protection, and UV resistance
- Inner Membrane – expands and contracts to store biogas safely
- Anchoring & Structural System – ensures stability and gas-tight sealing
DERFLEX designs its biogas membrane covers to meet the strict requirements of large-scale digestion systems, wastewater treatment plants, livestock farms, and waste-to-energy facilities worldwide. With 20+ years of industrial coated fabric expertise, DERFLEX ensures our biogas membrane covers meet international durability, permeability, and safety standards.
Key Features of DERFLEX Biogas Membrane Covers
DERFLEX biogas membrane covers are engineered to meet the long-term operational demands of modern anaerobic digestion systems. Each membrane is manufactured with industrial-grade PVC or TPU coated fabrics using advanced coating technology to deliver outstanding gas-retention performance and environmental durability.
1. Superior Gas-Tightness
Gas impermeability is the most critical factor for any biogas dome or storage unit. DERFLEX membranes achieve extremely low methane permeability rates thanks to their dense polymer matrix and high-quality coating layers. This ensures:
- Stable methane storage for long-duration projects
- Higher biogas purity and reduced leakage
- Improved energy production efficiency
2. Excellent UV, Weather, and Aging Resistance
Biogas systems are often exposed to harsh outdoor conditions for years. The outer membrane layer is formulated with UV-resistant additives and anti-aging components to withstand:
- High solar exposure
- Extreme temperature variations (from -40°C to +70°C)
- Long-term weathering and environmental stress
3. High Tensile Strength & Structural Stability
DERFLEX membranes use reinforced polyester base fabric with strong tear strength and tension load capacity, ensuring that the dome maintains its shape and structural reliability even under fluctuating wind pressures or gas volume changes.
4. Chemical & Microbial Resistance
Biogas production environments contain high concentrations of H2S, CO2, ammonia, and various organic compounds. DERFLEX PVC/TPU coatings offer excellent chemical resistance and prevent degradation caused by microbial corrosion.
5. Long Service Life (Up to 15–20 Years)
Through strict material selection and performance testing, DERFLEX biogas membrane covers are engineered for long-term operation with minimal maintenance requirements. TPU membranes can achieve even greater lifespan and durability in demanding industrial conditions.
6. Customizable to All Biogas Projects
We offer flexible customization options for:
- Membrane thickness (0.9mm–2.0mm)
- Colors (white, green, grey, black)
- Anti-condensation treatment
- Flame-retardant grade (B1, M2, NFPA701)
- Heat-weldable high-density seams
Technical Specifications of DERFLEX Biogas Membrane Covers
| Item | PVC Biogas Membrane | TPU Biogas Membrane |
|---|---|---|
| Base Fabric | High-tenacity polyester | High-tenacity polyester / high-strength TPU composite |
| Thickness | 0.9–1.5 mm | 1.0–2.0 mm |
| Tensile Strength | 2800–4000 N/5cm | 3500–5000 N/5cm |
| Tear Strength | 400–600 N | 500–900 N |
| Gas Permeability | ≤ 15 cm³/m²·24h·atm | ≤ 8 cm³/m²·24h·atm |
| Working Temperature | -30°C to +70°C | -40°C to +90°C |
| UV Resistance | Excellent (Outdoor grade) | Superior (Industrial grade) |
| Flame Retardant | Optional B1/M2 | B1/M2/NFPA701 |
| Service Life | 10–15 years | 15–20 years |
PVC membranes are ideal for agricultural, municipal, and standard industrial biogas projects, while TPU membranes provide enhanced durability and gas-tightness for advanced waste-to-energy and large-scale digesters.
PVC vs TPU Biogas Membrane Covers: What’s the Difference?
DERFLEX offers both PVC and TPU membrane options to meet different project budgets and performance requirements. The comparison below helps engineers and project managers choose the right membrane type:
- PVC → cost-effective, suitable for standard biogas tanks and moderate environmental conditions
- TPU → premium-grade, featuring superior gas retention, abrasion resistance, and chemical stability
TPU membranes exhibit significantly lower methane permeability—making them ideal for installations where energy optimization and long-term gas preservation are critical.
How the Double-Membrane Biogas Cover System Works
Most biogas membrane covers use a double-membrane system, consisting of:
- Outer Membrane – provides structural protection and withstands external forces
- Inner Membrane – expands or contracts depending on the volume of biogas stored
- Air Blower System – maintains dome pressure to keep the structure stable
- Anchoring System – ensures safe mechanical connection to the tank or foundation
When biogas is produced, the inner membrane inflates and stores the gas. As gas is consumed or transported, the membrane deflates accordingly. This dynamic working principle ensures:
- Constant storage pressure
- Stable gas quality
- Reduced methane leakage
- Improved digester efficiency
DERFLEX membranes maintain excellent flexibility even in extremely low temperatures, ensuring stable operation in cold regions.
Why Choose DERFLEX Biogas Membrane Covers?
As a leading manufacturer of industrial coated fabrics with more than 20 years of experience, DERFLEX provides high-performance biogas membrane covers engineered for long-term operation, harsh weather conditions, and demanding anaerobic digestion environments.
✔ Decades of Industrial Fabric Expertise
DERFLEX has served more than 1,000+ biogas engineering companies worldwide, supplying reliable membrane materials for biogas digesters, biogas storage systems, and agricultural waste treatment plants.
✔ Premium PVC & TPU Coated Performance
Our membranes are produced using reinforced polyester base fabric combined with high-adhesion PVC or TPU coating, ensuring extreme durability, excellent gas tightness, arc resistance, and anti-corrosion performance.
✔ Custom Engineering Service
DERFLEX supports custom patterns, reinforced parts, inlet/outlet design, safe walkway configuration, double-layer membrane domes, and complete accessories for biogas tank systems.
✔ International Certifications
Materials fully meet EU biogas storage standards, ISO quality management, and environmental protection requirements. Long-term UV testing, hydrolysis resistance testing, and gas-tightness testing are included in every production batch.
Technical Specifications of DERFLEX Biogas Membrane Covers
Below are the recommended technical standards for biogas digester roofs and double-membrane gas storage systems:
| Item | Specification |
|---|---|
| Base Fabric | High-strength polyester fiber 1000D×1000D |
| Coating Material | PVC / TPU / PVDF lacquer (double-sided coating) |
| Weight | 1100 g/m² – 1500 g/m² |
| Tensile Strength | 4200–5500 N/5cm |
| Tear Strength | 600–800 N |
| Temperature Resistance | -35°C to +70°C |
| Gas Tightness | Excellent / Long-term stable |
| UV Resistance | ≥ 5 years outdoor |
| Color Options | White, Grey, Green, Custom |
Applications of Biogas Membrane Covers
DERFLEX biogas membrane covers are designed for agriculture, municipal waste treatment, industry, and renewable energy projects.
- ✔ Double membrane biogas storage system
- ✔ Biogas digester dome cover
- ✔ Wastewater treatment anaerobic tank cover
- ✔ Landfill biogas collection system
- ✔ Agricultural livestock manure digestion system
- ✔ Industrial organic waste biogas plants
Key Advantages of DERFLEX Biogas Membrane Covers
1. High Gas Tightness
Manufactured using reinforced coating technology, DERFLEX membranes maintain stable gas tightness even under long-term methane exposure and pressure fluctuations.
2. Long-Term Weather Resistance
UV stabilization, anti-aging formula, and anti-hydrolysis technology ensure reliability for 10–15+ years.
3. Anti-Corrosion & Chemical Resistance
Resistant to H₂S, ammonia, methane, acidic gas components, and fermentation environment corrosion.
4. Excellent Flexibility
Suitable for extreme cold regions (as low as -35°C). No cracking, no stiffness during installation or operation.
5. Custom Shapes & Reinforcement
DERFLEX offers custom cutting, welding, reinforcement belts, corner patches, and professional installation guidance.
6. Stable Color & Clean Surface
PVDF top-coating ensures strong anti-dust and self-cleaning performance for better long-term appearance.
Installation Guide for Biogas Membrane Covers
DERFLEX provides complete installation guidance for biogas membrane covers to ensure stable performance and maximum gas storage efficiency. Whether it is a single-membrane or double-membrane system, professional installation ensures optimal mechanical stability, airtightness, and long-term durability.
1. Pre-Installation Preparation
- Check biogas tank structure, surface flatness, and anchor ring position.
- Ensure all metal fasteners and support frames are corrosion-resistant.
- Prepare appropriate membrane lifting equipment and welding tools.
- Confirm correct design parameters and membrane size before installation.
2. Membrane Positioning & Fixing
- Spread the membrane on a clean, flat surface to avoid sharp-object damage.
- Fix the membrane edges along the anchor ring using stainless fasteners.
- Check uniform tension to prevent wrinkles or excessive stress points.
3. Internal Air Pressure Adjustment
- Use air blowers to maintain the required pressure for dome shaping.
- Monitor internal pressure to avoid over-inflation.
- Ensure air inlet and outlet valves are positioned correctly.
4. Final Inspection
- Check seams, joints, and reinforced patches.
- Test airtightness and gas leakage resistance.
- Verify safety walkway and maintenance access components.
DERFLEX supports on-site installation guidance or remote technical assistance for international clients to ensure reliable and safe project operation.
Quality Control of DERFLEX Biogas Membrane Covers
As a professional PVC & TPU coated fabric manufacturer, DERFLEX implements comprehensive quality control systems covering raw materials, production processes, finishing, and final inspection. Every batch of biogas membrane fabrics undergoes strict certification procedures.
✔ Raw Material Inspection
All polyester base fabrics and PVC/TPU raw materials are tested for tensile strength, adhesion, and coating compatibility before production.
✔ High-Frequency Welding Test
Samples are welded and tested to ensure seam strength meets biogas pressure requirements and long-term airtightness standards.
✔ UV & Aging Test
The membrane surface is evaluated for anti-UV and weather resistance performance using accelerated aging equipment.
✔ Gas Tightness Inspection
Double-layer membrane systems must pass long-duration gas retention tests to guarantee safety in biogas storage applications.
✔ Final Visual Check
Each membrane dome is inspected for coating uniformity, color consistency, seam strength, and reinforcement positioning.
DERFLEX Global Biogas Membrane Project Cases
DERFLEX biogas membrane covers have been used in more than 60+ countries across Europe, Asia, Latin America, the Middle East, and Africa. Our products are widely applied in agricultural biogas plants, municipal sewage treatment stations, and industrial organic waste treatment projects.
✔ Germany – 3000m³ Double Membrane Gas Holder
High-strength PVC membrane with PVDF top coating ensures long-term chemical and UV resistance in European climates.
✔ Brazil – Agricultural Sludge Biogas Project
Flexible and durable membrane structures used in tropical high-humidity environments with over 8 years stable performance.
✔ China – Large-Scale Livestock Biogas System
More than 500+ biogas domes supplied to farming operations producing large volumes of organic waste.
✔ Poland – Municipal Waste Anaerobic Digestion Dome
Double-layer membrane system designed for low-temperature environments down to −25°C.
Frequently Asked Questions (FAQ)
1. What is a biogas membrane cover?
It is a gas-tight, flexible membrane structure used to seal biogas digesters or store biogas inside anaerobic tanks. DERFLEX membranes offer high durability, anti-corrosion performance, and long-term stability.
2. What materials are used?
High-strength polyester base fabric combined with PVC, TPU, or PVDF top coating for maximum weathering resistance.
3. How long is the service life?
Typically 10–15 years depending on climate, installation method, and membrane type.
4. Can DERFLEX customize membrane dimensions?
Yes. Custom shapes, welding, reinforcement patches, and installation accessories are all available.
5. Do you offer installation support?
DERFLEX provides detailed installation manuals, video guidance, and global project technical support.