Center Enamel’s Double Membrane Roofs for Glass-Fused-to-Steel (GFS) tanks are high-performance gas-holding systems specifically designed for anaerobic digestion and industrial wastewater treatment. Featuring an ISO 9001-certified dual-membrane design, these airtight roofs utilize a pneumatic air-buffer to regulate pressure and ensure 99.9% methane containment. Compatible with GFS, FBE, and stainless steel tanks, they provide a UV-resistant, 15–20+ year service life for global renewable energy infrastructure.
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Performance Metric | Double Membrane Specification | Strategic Operational Benefit |
Material Grade | High-Strength Polyester (PVC/PVDF Coated) | Maximum UV-stability and H2S corrosion resistance. |
Design Pressure | Up to 50 mbar (Customizable) | Precise gas regulation for stable CHP/flare feeding. |
Methane Permeability | < 400 cm3/m2·d·bar | 99.9% gas-tightness; prevents GHG leakage. |
Service Life | 15–20+ Years | Significantly reduced TCO in aggressive AD environments. |
Wind/Snow Load | Up to 1.5 $kN/m^2$ (Site-Specific) | Structural resilience in extreme geographic locations. |
Compliance | Eurocode 3, AWWA D103-09, ISO 28765 | Verified structural and safety integrity. |
The Center Enamel system functions as a dynamic, dual-layered pressure vessel.
● The Pneumatic Shield (Outer Membrane): A dedicated, explosion-proof blower maintains constant air pressure, ensuring the outer layer remains fully tensioned. This "air cushion" acts as a structural shield against wind, snow, and UV radiation.
● Environmental Isolation (Inner Membrane): The inner gas-holding membrane expands and contracts based on biogas production. Protected by the air buffer, it is never subjected to external mechanical stress or material fatigue.
● Air-Buffer Regulation: A precision air-valve system maintains constant pressure between layers, ensuring the inner membrane remains stable even at low fill levels, preventing "flapping" and extending material longevity.
We align our engineering with the most rigorous international construction codes:
● Eurocode 3 & Eurocode 1: Calculations for steel structures and wind/snow actions ensure the GFS tank and membrane roof function as a unified structural entity.
● AWWA D103-09: Compliance for bolted steel tank design and auxiliary roofing systems in global markets.
● ISO 28765: Adherence to the specialized standard for vitreous and porcelain enamelled steel tanks and biogas storage covers.
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● Configuration: Multi-Tank CSTR System | 3 Specialized Units (up to 18.34m)
● Total Volume: 3,458 m3
● Outcome: Successfully operational in high-humidity coastal zones; achieved 99.9% gas-tightness with zero methane leakage in a strictly regulated urban zone.
● Configuration: 4 CSTR Units | 25.21 × 8.4 m (H)
● Total Volume: 16,760 m^3
● Outcome: One of the largest regional livestock waste treatment installations, proving scalability for large-scale agricultural biogas recovery.
Q: How does a double membrane roof regulate biogas pressure?
A: It functions as a variable-volume vessel. An explosion-proof blower maintains steady inflation in the air buffer, while a pressure-relief valve automatically adjusts volume as the inner gas-holding membrane expands or contracts, ensuring stable discharge to CHPs.
Q: What is the difference between a single and double membrane tank cover?
A: Single membranes are for basic odor control and are prone to UV and wind damage. Double membranes feature a dedicated outer protection layer that shields the gas holder, providing superior thermal insulation and a 20+ year service life.
Q: Can membrane roofs be installed on existing GFS tanks?
A: Yes. Using a specialized stainless steel compression rim, our roofs offer retrofit compatibility for existing GFS, FBE, or stainless steel tanks, provided a structural audit confirms the shell can handle the localized tension.
