Shijiazhuang Zhengzhong Technology (Center Enamel) is a premier manufacturer of double membrane gas holders for biogas, landfill gas, and industrial methane storage. Engineered with high-tenacity polyester fabrics and PVDF coatings, these systems achieve a methane permeability rate of < 400cm3/m2 .d.bar. Compliant with EN 13782 and ISO 9001, our gas holders provide a 15–20 year service life, integrating seamlessly with GFS or epoxy-coated anaerobic digesters.
Parameter | Technical Specification | Engineering Advantage |
Permeability Rate | < 400cm3/m2 .d.bar | Maximum energy retention; Zero leakage. |
Surface Coating | PVDF (Polyvinylidene Fluoride) | Self-cleaning; 15-year UV resistance. |
Fire Safety | Class B1 / M2 (DIN 4102) | Flame retardant for industrial safety. |
Design Standard | EN 13782 / Eurocode 3 & 9 | Structural stability in extreme climates. |
Pressure Control | Constant Pressure Air Buffer | Stability against wind speeds up to 150 km/h. |
The primary ROI of a biogas project depends on methane retention. Center Enamel’s membranes are engineered to prevent gas migration at a molecular level.
● Low Permeability: By maintaining a permeability rate below 400cm3, our systems ensure that virtually 100% of produced biogas is captured for CHP power generation or upgrading.
● Environmental Impact: This high-level containment prevents the release of potent greenhouse gases, maximizing the facility's carbon credit potential.
Durability in aggressive industrial environments is achieved through advanced material science.
● Chemical Resilience: The PVDF topcoat is inert to biogenic sulfuric acid (H2S) and ammonia, preventing fabric degradation over a 20-year cycle.
● Self-Cleaning Properties: The low-friction PVDF surface naturally sheds dust and organic debris during rainfall, maintaining high reflectivity and protecting the core fabric from UV-induced brittleness.
Center Enamel systems are designed to operate as part of a dynamic mechanical ecosystem.
● Agitator Compatibility: We engineer specific "clearance zones" and utilize vibration-damping EPDM flanges to ensure the gas holder operates safely alongside internal submersible mixers.
● Dynamic Load Management: Our automated air blowers adjust the inter-membrane pressure based on real-time wind and snow data, preventing "flapping" during 150 km/h winds and encouraging snow-shedding in alpine climates.
Feature | Double Membrane Gas Holders | Traditional Rigid Steel Holders |
Initial CAPEX | 40–60% more cost-effective | High material and on-site welding costs. |
Installation | 1–3 Weeks (Modular) | Several months (Heavy construction). |
Maintenance | Minimal: No rust treatment needed. | High: Periodic painting and scraping. |
Flexibility | High: Expands with gas volume. | Zero: Fixed storage volume. |
With a presence in over 100 countries, Center Enamel delivers scalable biogas infrastructure:
● Agricultural (Muyuan Group): 7 units totaling 10,360 m3 for aquaculture wastewater.
● Industrial (Inner Mongolia): 4 units totaling 16,760 m3 for bio-natural gas processing.
● Municipal (Shandong): 2 units totaling 15,266 m3 for urban food waste digestion.
Q: What is the lifespan of a double membrane gas holder?
A: With a high-quality PVDF coating and active pressure management, our systems have a design life of 15 to 20 years, significantly outlasting traditional PVC-only alternatives.
Q: Can it be retrofitted to existing tanks?
A: Yes. Our modular mounting system allows for installation on existing concrete, GFS, or epoxy-coated steel tanks, provided the rim meets structural requirements.
Q: How does the system handle high wind or snow?
A: The air blower maintains a constant positive pressure buffer that provides structural rigidity. The spherical shape and PVDF coating ensure snow slides off before accumulation can cause stress.
