Double Membrane Gas Holder & Biogas Gas Holder (DMG Series)
EnvironTec Double Membrane Gas Holder (Biogas Gas Holder / DMG Series) provides low-pressure flexible biogas storage from 20 m³ to 6,000+ m³ (up to 20,000 m³ custom). In our official model nomenclature, the primary number denotes total outer membrane volume while the bracketed number indicates effective inner biogas storage volume—for example, a 500 m³/h plant requiring 2 hours of storage (1,000 m³ effective volume) selects Model DMG-1150 (1000m³) with Φ13.75m × 10.31m outer dimensions, 22 mbar operating pressure, and 18 anchor plates.
20 standardized civil foundation sizes + Custom-Made tank-top domes.
Sized with 15% outer-to-inner volume margin (e.g., 1000m³ inner -> DMG-1150).
3,200–9,000 N/5cm tensile strength; CH4 permeability ≤150 ml/(m²·d·bar).
Includes stabilizing blower, DN150 liquid safety seal, ultrasonic level & anchor plates.
Standard Models, Dimensions & Technical Specifications
| Standard Model Nomenclature | DMG-[Outer Volume] ([Inner Effective Biogas Volume m³]) — e.g., DMG-540(500), DMG-1150(1000), DMG-1580(1500), DMG-2100(1900), DMG-2720(2500), DMG-3460(3000), DMG-5770(5000), DMG-7080(6000) |
|---|---|
| Recommended Storage Time | 1.0 Hour minimum | 2.0 Hours or more recommended per local engineering regulations |
| Operating Pressure Range | 10 mbar to 50 mbar (Model specific: e.g., DMG-1150 operates at max 22 mbar) |
| Membrane Material Brand | German Mehler Heytex / Chuckage Biogas-Grade Polyester + Double-Sided PVDF |
| Structural Wind & Snow Load | Wind speed up to 110 km/h (Typhoon Grade) | Snow load ≥ 50 kg/m² |
| Standard Included Accessories | Outer/Inner/Bottom membranes, 1x stabilizing air blower, DN150 SS304 safety water seal, 2 pairs DN150 center flanges, ultrasonic level transmitter, 45°C temp sensor, pressure gauge, SS304 anchor bolts & plates |
| Optional Upgrades | Standby blower (1 duty + 1 standby), Ex-proof VFD constant-pressure PLC cabinet, LEL gas leak detector, electric heat tracing & auto water-refill for safety seal |
Technology & Lifecycle ROI Comparison Matrix
| Technology / Series | Capacity / Range | Performance / Lifespan | OPEX / Engineering Feature | Key Application Advantage |
|---|---|---|---|---|
| EnvironTec DMG Double Membrane | 20 – 20,000 m³ | 15 – 20 Years (PVDF) | Zero rail greasing or anti-rust painting | 3–5 Days Bolted Installation on Flat Slab |
| Wet Spiral Steel Gas Holder | 500 – 10,000 m³ | 8 – 10 Years (H2S Corrosion) | High (Annual painting + winter water heating) | 3–6 Months Heavy Field Welding |
| Low-Grade PVC Gas Balloon | 20 – 500 m³ | 2 – 3 Years (UV Cracking) | Cannot regulate pressure; high leak risk | Unprotected against wind/rain |
Engineering & Sizing FAQ
Q: Why is a 1,000 m³ effective biogas storage requirement matched with Model DMG-1150?
In double membrane gas holder engineering, the outer air-pressurized membrane hemisphere must be slightly larger than the inner biogas membrane to accommodate the bottom anchor ring angle and air buffer space. Model DMG-1150 provides an exact 1,000 m³ inner biogas storage capacity within a 1,150 m³ outer dome (Φ13.75m diameter × 10.31m height, 18 anchor plates, 22 mbar max pressure).
Q: What civil foundation information does EnvironTec provide during preliminary sizing?
For every DMG model, our engineering team immediately provides the exact outer ring diameter (m), dome height (m), number of foundation anchor plates (14 to 33 plates), operating pressure (mbar), and dynamic wind/anchor load calculations for your civil engineers.