Biogas Bags – High-Quality Flexible Storage Solutions for Biogas & Renewable Energy | derflex

4. Technical Specifications of DERFLEX Biogas Bags

DERFLEX biogas bags are engineered using reinforced PVC-coated polyester fabric, optimized for anaerobic digestion environments, high methane concentration, UV radiation, microbial corrosion, and extreme outdoor installation conditions. The following specification sheet provides detailed technical information required by engineers, agricultural designers, EPC contractors, and environmental project managers.

4.1 Material Composition

4.2 Physical Performance

4.3 Environmental & Chemical Resistance

4.4 Gas Storage Performance

4.5 Available Fabric Models

4.6 Optional Accessories

• Biogas inlet/outlet valves (DN50–DN150)
• Pressure relief safety valve
• Flange connectors & stainless steel clamps
• Gas level indicator system
• HDPE ground protection pad
• Anchor belts & anti-wind straps

All specifications can be fully customized according to project scale, gas storage capacity, environmental conditions, and long-term deployment requirements. DERFLEX supports OEM/ODM service for global biogas projects.

5. Applications of DERFLEX Biogas Bags

DERFLEX biogas bags are widely applied across agricultural, industrial, and environmental sectors. With reinforced PVC coated fabric and advanced anti-corrosion technology, they provide safe and stable gas storage for traditional farms, large-scale biogas plants, municipal waste treatment, and renewable energy projects. Below are detailed application scenarios supported by real-world project needs.

5.1 Agricultural Biogas Production

In agricultural environments, biogas bags are used for processing livestock manure, poultry waste, and agricultural residues such as straw and silage. They are ideal for small-to-medium farms and rural biogas programs. DERFLEX biogas bags reduce energy cost, improve waste treatment efficiency, and provide a clean renewable fuel source for cooking, heating, and electricity generation.

• Dairy farms, cattle farms, pig farms
• Poultry processing facilities
• Rural biogas energy programs
• Manure-to-energy initiatives

5.2 Municipal Waste Treatment

Municipal solid waste (MSW) and food waste often undergo anaerobic digestion to generate biogas. DERFLEX biogas bags act as flexible storage units for anaerobic digesters, stabilizing gas pressure and accommodating fluctuating gas production. They also support urban environmental programs that aim to reduce landfill emissions and convert organic waste into renewable energy.

• Municipal sludge treatment plants
• Urban food waste digesters
• Community renewable energy programs
• Greenhouse gas reduction initiatives

5.3 Industrial Biogas & Methane Storage

Industrial sectors that produce organic by-products—such as breweries, food processing plants, and paper mills—generate large volumes of biogas. DERFLEX biogas bags are engineered for high-capacity storage, supporting continuous gas supply for burners, boilers, and power generation units. Their high-tensile performance ensures long-term reliability in industrial settings.

• Food & beverage manufacturing
• Paper mills and pulp factories
• Biofuel and ethanol plants
• Biogas-based combined heat and power (CHP) facilities

5.4 Environmental & Renewable Energy Projects

Environmental engineering projects often require flexible gas storage solutions for pilot-scale experiments, wastewater treatment, and low-pressure gas systems. DERFLEX biogas bags are suitable for temporary setups, rapid-deployment projects, and long-term sustainable energy programs.

• Wastewater treatment plant biogas capture
• Landfill methane recovery
• CO₂ reduction & carbon credit applications
• Renewable energy R&D facilities

5.5 Emergency, Mobile & Temporary Gas Storage

Due to their lightweight structure and easy installation, DERFLEX biogas bags are ideal for mobile and emergency energy supply. They can be rapidly deployed in disaster relief zones, off-grid sites, or temporary industrial operations where a stable gas supply is required.

• Emergency energy supply in disaster relief
• Temporary construction site heating fuel
• Remote rural communities without stable pipeline access
• Mobile biogas demonstration systems

5.6 Biogas Upgrading & Energy Storage

For biogas upgrading plants, DERFLEX biogas bags can serve as buffer tanks before or after gas purification processes, maintaining stable pressure for CO₂ removal, desulfurization, and methane concentration. They help ensure continuous gas flow for compressors and upgrading modules.

• Pre-upgrading biogas buffering
• Post-upgrading methane storage
• Pressure stabilization for gas compressors
• Biogas-to-biomethane pipeline injection systems

5.7 Commercial Agriculture & Farming Groups

Large integrated agriculture groups use biogas bags as part of their waste-to-energy systems to reduce carbon emissions and operational cost. DERFLEX supports long-term, heavy-duty solutions for continuous operation in varying climate conditions, enabling industrial-grade biogas management.

• Integrated livestock & crop farms
• Large agricultural energy centers
• Regional farm biogas distribution networks
• Sustainable farming development projects

5.8 Customized Biogas Storage Solutions

DERFLEX provides OEM/ODM biogas systems to meet specific project requirements. The company offers custom shapes, pressure ratings, volume capacities, valve configurations, fabric models, and ground anchoring systems tailored to any geographical or industrial condition.

• Custom gas volume (1–3000 m³ or beyond)
• Customized installation structure (horizontal, dome, pillow-type)
• Pressure and flow rate customization
• Integration with pumps, mixers, blowers, and digesters

With more than 20 years of manufacturing expertise, DERFLEX ensures that every biogas bag meets global standards for anaerobic gas storage, environmental safety, and long-term operating performance.

6. Manufacturing Process of DERFLEX Biogas Bags

DERFLEX biogas bags are produced through a fully controlled engineering system that combines high-strength PVC coated fabric technology, precision thermal welding, and multi-stage quality testing. Every step is designed to guarantee long-term gas retention, pressure stability, chemical resistance, and durability under harsh agricultural, industrial, and environmental conditions.

As a professional PVC coated fabric manufacturer with over 20 years of experience, DERFLEX ensures that each biogas bag meets international standards for anaerobic digestion gas storage and environmental safety. Below is an in-depth overview of our complete manufacturing procedures.

6.1 Premium Raw Material Selection

The manufacturing process begins with carefully selected raw materials. DERFLEX uses high-tenacity polyester base fabric combined with premium PVC compounds designed for chemical stability, UV protection, and microbial resistance. Each batch undergoes strict QC evaluation to ensure consistency and performance.

• High-tenacity polyester base cloth (500D~2000D)
• Anti-acid and anti-corrosion PVC formulation
• Eco-friendly plasticizers with low volatility
• Special UV & anti-aging additives for outdoor durability
• Fire-retardant and antimicrobial optional additives

6.2 PVC Coating & Lamination Process

The fabric is produced through advanced knife-coating or hot-lamination technology, which ensures uniform thickness and strong bonding between the PVC layers and polyester base. This provides outstanding mechanical stability required for pressure-bearing gas storage.

• Knife coating for heavy-duty biogas fabric
• Hot lamination for smooth, flexible finish
• Consistent thickness: 0.7–1.5 mm (customizable)
• Reinforced top/bottom layers for extra strength
• Anti-wicking properties to prevent edge degradation

6.3 High-Temperature Drying & Surface Finishing

After coating, the fabric goes through a curing system to enhance adhesion strength and chemical resistance. The surface finishing is optimized based on the final application, such as matte anti-slip, glossy chemical resistance, or smooth welding-friendly surface.

• 180–220°C thermal curing for polymer stabilization
• Surface smoothing for seamless welding
• Anti-slip textures for installation safety
• Enhanced UV top coating for outdoor biogas plants

6.4 Automated Cutting & Precision Panel Layout

Before welding, each panel of the biogas bag is cut using CNC or automated cutting machines. This guarantees accuracy in shape, improves structural balance, and optimizes pressure distribution during gas storage.

• CNC blade cutting for high accuracy (±1 mm tolerance)
• Optimized fabric layout for strength distribution
• Minimized seam quantity for reduced leakage risk
• Special reinforcement panels for stress areas

6.5 High-Frequency & Hot-Air Welding Technology

All DERFLEX biogas bags are assembled using advanced welding technologies to ensure airtight seams. Depending on project requirements, we use:

• High-frequency welding (HF) for ultra-strong seam bonding
• Hot air welding for large seams and long fabric joints
• Double seam reinforcement for high internal pressure
• Leak-proof reinforced corner welding

Each welded seam is tested for tensile strength, peel adhesion, and airtight performance before proceeding to the next manufacturing step.

6.6 Assembly of Valves, Ports & Reinforcement Accessories

The biogas bag is then equipped with gas outlets, safety valves, pressure-relief devices, and inlet connectors. DERFLEX uses industrial-grade accessories compatible with methane, CO₂, and mixed anaerobic gases.

• Methane-resistant inlet/outlet valves
• Pressure relief and safety valves
• Reinforced hose connectors
• Optional double-chamber design for safety buffering
• Ground anchoring systems for outdoor installation

6.7 Multi-Stage Quality Control (QC) System

Quality is the core of DERFLEX manufacturing. Each biogas bag undergoes strict QC inspection at every production stage. This ensures safety, durability, and compliance with international environmental standards.

• Tensile strength and tear resistance testing
• Seam peel strength and leakage tests
• Chemical resistance evaluation
• UV aging simulation tests
• High-pressure inflation testing before shipment

6.8 Packaging & Logistics

After QC approval, the biogas bags are folded, packed, and shipped with protective layers to prevent damage during transportation. All components—including valves, connectors, ropes, and anchors—are packed with the unit.

• Moisture-proof and UV-protected packaging
• Individual component labeling for easy installation
• Export-grade pallets and cartons
• Global shipping available (sea, air, land freight)

With advanced machinery, standardized operating procedures, and a highly trained engineering team, DERFLEX guarantees every biogas bag meets international requirements for renewable energy, waste management, and industrial methane storage applications.

7. Comparison: DERFLEX Biogas Bags vs. Traditional Gas Storage Systems

When selecting a gas storage system for agricultural, industrial, or municipal biogas applications, customers often compare flexible biogas bags with traditional dome digesters, steel tanks, concrete structures, and high-pressure cylinders. This section provides an in-depth comparison to help you understand why DERFLEX biogas bags have become one of the most efficient, cost-effective, and environmentally friendly solutions for methane and biogas storage.

7.1 Comprehensive Comparison Table

7.2 Key Advantages of DERFLEX Biogas Bags

Compared to fixed structures and metal tanks, DERFLEX biogas bags offer unique performance advantages that make them ideal for both small and large energy projects. Below are the core benefits.

• Flexible installation: Suitable for uneven ground and rural locations.
• Low investment cost: No construction or heavy equipment required.
• Fast deployment: From delivery to operation within 24–48 hours.
• High durability: Multi-layer reinforced PVC fabric resists chemicals and UV.
• Safe low-pressure design: Reduces explosion risks found in rigid tanks.
• Easy expansion: Additional units can be added as gas production increases.
• Environmentally friendly: Lower carbon footprint during production and operation.

7.3 Application Scenarios Where Biogas Bags Perform Better

Although concrete and steel tanks have their role in industrial-scale biogas systems, biogas bags outperform them in many practical applications:

• Small- and medium-scale rural biogas projects
• Agricultural waste-to-energy systems
• Mobile and temporary energy supply
• Pilot biogas experiments and research programs
• Low-pressure methane storage
• Locations with limited budget or construction resources

7.4 When Traditional Systems May Be More Suitable

In very large-scale industrial projects where high internal pressure, extremely long life cycles, or permanent civil infrastructure is required, traditional digesters or steel tanks may still be preferred. DERFLEX often supports such applications with custom heavy-duty double-layer fabric systems.

• Industrial methane purification plants
• High-pressure gas compression systems
• Large-scale urban gas pipeline injection plants
• Permanent civil construction energy systems

7.5 Summary: Why DERFLEX Biogas Bags Are A Better Choice

For most agricultural, rural, environmental, and general biogas storage projects, DERFLEX biogas bags outperform traditional storage solutions due to their superior flexibility, affordability, durability, and safety. They deliver long-term operational efficiency while simplifying installation and maintenance.

With proven engineering, advanced PVC-coated fabric technology, and a global track record of renewable energy projects, DERFLEX biogas bags represent the next generation of sustainable and cost-effective gas storage solutions.

9. Installation Guide for DERFLEX Biogas Bags

Proper installation is critical for optimal performance and long-term durability of DERFLEX biogas bags. This step-by-step guide provides detailed instructions for safe deployment in agricultural, industrial, and municipal environments.

9.1 Pre-Installation Site Preparation

• Select a flat, stable, and clean surface free of sharp objects.
• Ensure proper drainage to avoid water accumulation under the bag.
• Verify soil bearing capacity for heavy biogas bags; use HDPE pads or compacted ground if necessary.
• Check wind exposure; use anchor belts for areas with high wind speeds.

9.2 Unpacking and Inspection

• Carefully remove the biogas bag from packaging without dragging across rough surfaces.
• Inspect all seams, valves, connectors, and fabric for damages or defects.
• Confirm that all accessories (valves, anchors, ropes) are included as per delivery checklist.

9.3 Positioning the Bag

• Lay the bag flat with valves facing the correct direction for gas inlet/outlet.
• Ensure that all edges are evenly aligned with anchor points or HDPE pads.
• Avoid folding or creasing the main body, which can create stress points during inflation.

9.4 Anchoring and Securing

• Use provided anchor belts, ropes, or stakes according to site layout.
• Install anti-wind straps to maintain stability during high winds.
• Check all fasteners and anchor points for tightness before inflation.

9.5 Inflation Procedure

• Connect the gas supply line to the inlet valve securely.
• Gradually inflate the bag, monitoring pressure using built-in indicators.
• Ensure uniform inflation; avoid over-inflation to prevent seam stress.
• Check for leaks using a soap-water solution or ultrasonic detector.

9.6 Operational Checks

• Verify that safety valves function correctly and release excess pressure when necessary.
• Monitor pressure and volume for the first 24 hours to ensure stable operation.
• Confirm valve and connector tightness periodically.
• Inspect the bag weekly during the first month to identify any potential issues early.

9.7 Maintenance Tips

• Keep the exterior clean; remove debris and sharp objects near the bag.
• , Check valves and connectors monthly for wear or leakage.
• Ensure no water or mud accumulates beneath the bag.
• Re-anchor straps and belts after strong wind or heavy rain events.
• Store spare valves and repair kits on-site for quick emergency response.

Following these installation and maintenance guidelines will maximize the lifespan of DERFLEX biogas bags, enhance operational safety, and ensure consistent methane production for energy applications.

10. Derflex Company Profile & Why Choose Us

10.1 Company Overview

Derflex is a global leader in high-quality PVC coated fabrics and biogas storage solutions. With over 20 years of experience, Derflex specializes in designing, manufacturing, and delivering innovative, durable, and environmentally-friendly biogas bags for agricultural, industrial, and municipal applications. Our solutions comply with ISO, SGS, and REACH standards, ensuring superior performance and long-term reliability.

10.2 Why Choose Derflex

• 20+ years experience: Professional engineering & manufacturing expertise.
• High-quality materials: Premium PVC, reinforced polyester, UV & chemical resistant.
• Customized solutions: OEM/ODM biogas bags tailored to client needs.
• Fast delivery: Efficient production, export-ready packaging.
• Global presence: Exported to 60+ countries worldwide.
• Strict QC: Multi-stage testing for tensile strength, air-tightness, and chemical resistance.
• Environmentally responsible: Renewable energy support & low environmental impact.
  
  
  

  

  

  

  

11. Frequently Asked Questions (FAQ)