DuoSphere™ Double Membrane Gas Holder

Dual Membrane Biogas Storage Solution

As energy costs grow, facilities are increasingly seeking alternative fuel sources, including biogas, to help offset power costs for their plants. WesTech has many years of experience in supplying customers with anaerobic digestion equipment that adds value to plant operations.

By storing methane contained in the biogas, the DuoSphere™ allows a steady fuel source for a variety of functions.

  • Process heating
  • Sludge drying
  • Cogeneration
  • Facility heating
  • Vehicles and equipment

The DuoSphere offers innovative designs for digester gas storage and alternatives for conventional digester covers. DuoSphere gas holder structures are strong, lightweight, and versatile – a preferable choice in biogas storage for your municipal or industrial applications.

Whether your application requires a slab-mounted gas holder or a tank-mounted alternative to steel digester covers, our DuoSphere dual membrane structures are standout solutions for biogas storage. The superior design features high-strength fabric and utilizes a radio frequency welding process for increased strength and safety.

Slab-Mounted DuoSphere Gas Holders – A Simple and Inexpensive Way to Add Gas Storage

  • Mounts to flat concrete slab or short walls
  • Gas chamber comes sealed from the factory
  • Easy access to inspect inner membrane

Tank-Mounted DuoSphere Digester Cover – An Innovative and Cost-Effective Solution for New and Replacement Covers

  • Alternative to more costly steel covers
  • Ideal for retrofits
  • Variable liquid level

Expert Installation

Make sure your dual membrane installation goes as quickly and smoothly as possible. Membrane structures are less costly and quicker to install than steel structures, in general. By choosing WesTech for your installation, you’ll cut down the installation time even further. Our many years of experience makes the installation experience seamless and efficient for our customers.

DuoSphere Gas Holder DuoSphere Digester Cover
Purpose Slab-mounted gas storage Tank-mounted digester cover and gas storage
Materials PVC-coated polyester fabric membranes, stainless steel anchors PVC-coated polyester fabric membranes, stainless steel anchors
Fabrication methods Radio frequency welds form a very strong seam – Support cables are typically not necessary Radio frequency welds form a very strong seam – Support cables are typically not necessary
Sizes 700 cubic feet to 317,800 cubic feet (20 cubic meters to 9,000 cubic meters) Custom fabricated to fit tank
Footprint 15 to 100 feet concrete slab 25 to 100 feet diameter plus
Fans AMCA spark-resistant construction, two fans for safe duty/standby operation AMCA spark-resistant construction, two fans for safe duty/standby operation
Installation 1 to 3 weeks 2 to 3 weeks
95' Digester Cover Comparison
Cover Type Installed Weight (lbs.) Gas Storage (cubic feet) Installation Duration (weeks)
DuoSphere 7,500 150,000 (above wall) 2 to 3 weeks
Steel gas holder 505,000 33,000 2 to 3 months

Benefits and Features

  • Critical inner gas holding membrane is independent of the outer membrane
  • PVC-coated polyester fabric membranes, stainless steel anchors
  • Access is available to inspect the inner membrane at all times
  • Airflow between the membranes is accurately controlled
  • Gas detection equipment monitors the air between the membranes
  • AMCA spark-resistant and explosion-proof pressurization fans
  • Complete service from design to fabrication to installation and commissioning
  • Fast installation (1 to 3 weeks)
  • Gas holder volumes from 700 cubic feet to 317,800 cubic feet (20 cubic meters to 9,000 cubic meters)
  • Radio frequency welds form a very strong seam
  • Volume is measured ultrasonically
  • Constant pressure regulation
  • Custom flow and sizes
  • Low capital and installation cost
  • Absolute odor containment
  • No field welding, painting, or blasting
  • Often eliminates the need for complex reinforcing cables or frameworks
  • When used for retrofits, allows reuse of existing mechanical equipment

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