In the global transition to renewable energy, efficient biogas storage is as critical as its production. Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel) specializes in the design and fabrication of Stand-Alone Double Membrane Gas Holders. These independent storage systems provide a high-capacity, low-pressure buffer essential for stabilizing Combined Heat and Power (CHP) units and maximizing energy recovery from organic waste.
With over 30 years of expertise, Center Enamel delivers gas containment solutions engineered for extreme climates, stringent safety standards, and maximum methane abatement.
Our freestanding gas holders are precision-engineered to provide constant pressure and 100% gas tightness.
Parameter | Specification Range / Material | Engineering Benefit |
Storage Capacity | 20 m3 to 10,000 m3 | Scalable from small farm digesters to municipal plants. |
Operating Pressure | 10 mbar to 30 mbar | Ensures stable feed for biogas engines (CHP). |
Membrane Material | PVC-coated polyester fabric | High-tenacity, H2S resistant, and UV stabilized. |
Temp. Resistance | -30°C to +70°C | Reliable performance in both Arctic and Tropical zones. |
Gas Tightness | < 400 cm3/m2 . d .bar | Minimizes fugitive methane emissions. |
Design Life | 10+ Years | Long-term ROI with minimal maintenance requirements. |
Safety is the primary engineering constraint for stand-alone storage. Our systems integrate multi-layered protection to ensure zero-leakage performance under extreme conditions.
Biogas output fluctuates. Our systems utilize Dual-Direction Safety Valves (Water-seal or Weight-loaded) to prevent membrane rupture during pressure spikes and avoid vacuum-induced collapse.
Operating in hazardous zones requires total static control.
● Anti-Static Coating: Our inner membranes feature a proprietary conductive layer to safely dissipate electrostatic charges, meeting ATEX Zone 0/1 internal standards.
● ATEX Components: All blowers, sensors, and valves are certified for use in potentially explosive atmospheres.
Integrated Ultrasonic Gas Leak Detectors and Methane (CH4) sensors monitor the air buffer space. Any breach in the inner membrane triggers an immediate SCADA alarm for emergency shut-off.
Feature | Stand-Alone (Freestanding) | Integrated (Tank-Top) |
Maintenance | Superior. Serviceable without tank downtime. | Complex. Requires tank decommissioning. |
Installation | Dedicated concrete base required. | Mounted directly on the tank rim. |
Safety | Easier to isolate from the digester. | Shared structural stress with the tank. |
Best Use Case | Large-scale centralized biogas plants. | Compact sites with limited footprint. |
Center Enamel’s gas holders are engineered to meet the world’s most stringent industrial safety codes:
● DIN 4102-B1: Certified flame-retardant membranes for fire protection.
● Eurocode 3 (EN 1993): Structural design for wind speeds up to 150 km/h and heavy snow loads.
● ISO 9001:2015: Rigorous quality management and factory testing (Holiday testing).
● Capacity: 4,407 m3 total system volume.
● Operational Record: Stable operation since 2017, proving the long-term durability of our FBE tanks and membrane covers in high-capacity municipal waste treatment.
● Capacity: 3,458 m3 total system volume.
● Key Success: Met the stringent tropical urban environmental standards of Singapore, maintaining zero-odor leakage since 2021.
● Capacity: 3,077 m3 total system volume.
● Timeline: Completed in 2019, providing a consistent methane buffer for agricultural energy recovery.
Q: How do stand-alone gas holders handle wind and snow loads? A: We use Finite Element Analysis (FEA) to ensure structural stability. The pressurized outer membrane creates a geodesic shape that sheds snow and resists wind speeds up to 150 km/h.
Q: Can these holders contribute to Carbon Credits? A: Yes. By preventing methane leakage and enabling efficient energy recovery, our systems provide the verifiable data required for VCS or Gold Standard carbon financing.
Choosing Center Enamel means partnering with a manufacturer that provides a one-stop solution. We fabricate the bolted storage tanks (GFS, FBE, Stainless Steel) and the gas holders in-house, ensuring perfect component compatibility.
