Wiefferink - Model AB Cover - Durable Cover and Gas Holder
From Biogas
The Air Blown Cover is an innovative double membrane roof with a relatively large, variable gas-storage volume, for biogas installations and other purposes. Its shape and membrane pressure mean that weather influences have little effect on the AB Cover.
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Advantages
- Gas storage volume at ø 25m is about 230% larger than in conventional designs
- Lower membrane foil has 35% lower gas permeability
- Easy accessibility for maintenance and overhaul activities
- Lower silo load due to hemispherical construction
- Low wind sensitivity and lower chance of snow accumulation due to stable construction
- No condensed, corrosive liquid on the silo walls
Overview:
The standard version of the AB Cover includes:
- An outer membrane of UV-resistant biaxial woven foil
- An inner membrane of chemically resistant biaxial woven foil
- A blower (or blowers) to maintain the pressure on the outer membrane
- Compressed air connections
- An over/under-pressure valve
- A manual height gauge, to measure the gas volume
Available Options
- ATEX fans
- One or more inspection openings and a viewing window
- Special edge finishes and a height gauge (winter edition)
- An ultrasonic height gauge
- A gas-tightness test
Applications
- Cover and gas collection in biogas installations.
- Cover and gas collection in water treatment installations.
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