Center Enamel is a premier China Flexible Double Membrane Gas Holder Manufacturer, providing advanced biogas containment solutions compliant with ISO 9001 and international safety standards. Utilizing high-strength, PVC-coated polyester membranes with superior methane impermeability (<400 cm3m2 24h 0.1MPa), our gas holders offer a 15-25 year service life. By integrating an automated low-pressure air blower system and precision high-frequency welding, we ensure 100% airtight storage for agricultural, industrial, and municipal anaerobic digestion (AD) projects in over 100 countries.
Feature | Technical Specification | Strategic Reliability Value |
Primary Material | PVC-Coated Polyester Fabric | High tensile strength and UV/Chemical resistance. |
Gas Permeability | 400cm3 / (m2 .d . bar) | Minimizes methane loss and environmental odor. |
Operating Pressure | 0.5 kPa to 5.0 kPa | Stable delivery to CHP units and boilers. |
Fabrication Tech | High-Frequency (HF) Welding | Creates a molecular bond stronger than the fabric. |
Flame Retardancy | B1 / M2 Class | Essential for fire safety in biogas zones. |
Temperature Range | -30°C to +70°C | Reliable performance in arctic and tropical climates. |
The inner membrane serves as the primary containment vessel. It is highly flexible, expanding and contracting dynamically to accommodate fluctuating biogas production rates without changing the internal pressure. This prevents "slugging" in the gas supply to downstream equipment.
The outer membrane is permanently inflated by a dedicated air blower, creating a rigid dome shape. This pressurized air buffer (the inter-membrane space) provides:
● Structural Stability: Protects the inner membrane from wind loads (up to 150 km/h) and snow accumulation.
● Thermal Insulation: Maintains stable temperatures for the methanogen bacteria, optimizing biogas yield in cold climates.
As a unique "One-Stop" manufacturer, Center Enamel ensures perfect compatibility between the containment vessel and the gas holder.
● Unified Engineering: We design the tank and the gas holder as a single cohesive unit. This eliminates the risk of flange misalignment or seal failure at the tank-top interface.
● Corrosion Synergy: Our GFS tanks (pH 1–14 resistance) paired with our PVC-coated membranes create a system that is 100% resistant to the sulfuric acid and moisture found in raw biogas.
● Agricultural (Muyuan Group): Total volume of 10,360 m3 across 7 units for aquaculture wastewater treatment.
● Industrial (Bio-Natural Gas): A massive 16,760 m3 installation in Inner Mongolia for diverse organic waste processing.
● Municipal (Shandong Heze): 15,266 m3 for urban food waste digestion, emphasizing high-capacity odor control.
Q: How does a flexible gas holder handle over-pressurization?
A: Every Center Enamel system is equipped with an integrated hydraulic or mechanical safety valve (PVRV) that automatically releases gas if internal pressure exceeds the design limit, protecting the membrane from rupture.
Q: What is the expected maintenance for a membrane holder?
A: Unlike rigid steel covers, membrane holders require minimal maintenance. Annual inspections of the air blower, pressure sensors, and visual checks of the outer membrane skin are sufficient to ensure a 20-year lifespan.
Q: Can these be installed on concrete tanks?
A: Yes. While optimized for our GFS tanks, our gas holders can be custom-engineered for installation on existing concrete ring walls or independent concrete bases using specialized stainless steel anchor systems.
