Biogas Collection Covers Installation

Biogas Collection Covers

Plastic Fusion Fabricators designs and installs biogas collection covers for anaerobic digesters, lagoons, tanks, and wastewater treatment systems. Whether you’re capturing methane for energy recovery or managing emissions for regulatory compliance, our custom-fabricated floating and fixed-mount covers deliver gas-tight containment, pressure control, and long-term durability in corrosive biogas environments.

Every biogas cover we install is engineered for the specific chemistry and operating conditions of your system. Anaerobic digestion produces a corrosive gas mix — methane, CO₂, hydrogen sulfide — that attacks standard materials and degrades poorly designed seam systems. Our covers are fabricated from HDPE, XR-5, and reinforced polypropylene geomembranes selected for H₂S resistance, UV stability, and long-term flexibility under gas pressure cycling. Seams are fusion-welded and tested to ensure gas-tight integrity across the full cover area, including every pipe penetration, access hatch, and condensate drain.

With 40+ years in environmental containment and a track record as a pioneer in anaerobic digester lagoon systems, Plastic Fusion brings field-proven expertise to every biogas cover project — from single-tank municipal installations to multi-lagoon dairy and RNG recovery facilities.

What We Design and Install

• Gas collection covers for concrete digesters and steel tanks
• Biogas collection tank covers for municipal and industrial wastewater facilities
• Biogas collection pond covers for lagoon-based anaerobic digestion systems
• Floating cover biogas digester systems for covered lagoon applications
• Heat retention lagoon covers with integrated gas collection
• Insulated biogas covers for cold-climate digester performance
• Reinforced membrane systems rated for corrosive gas exposure and UV

Gas Collection Integration and Biogas Infrastructure

A biogas cover is only one component. We integrate complete gas collection systems including:

• Biogas header piping and manifold systems — fabricated in-house from HDPE
• Condensate management drains and low-point collection
• Pressure/vacuum relief assemblies
• Gas-tight pipe penetrations and access hatches
• Tie-ins to flare stacks, CHP generators, or RNG upgrading equipment
• Ballast systems, rainwater drainage, and cover tensioning

Our industrial pipe fabrication shop builds custom HDPE spools, manifolds, and fittings for biogas piping infrastructure — so your gas collection system arrives site-ready and integrates cleanly with your cover installation.

Applications

• Municipal wastewater treatment plant digester covers
• Dairy and livestock manure lagoon biogas covers
• Food and beverage processing anaerobic digestion systems
• Industrial wastewater lagoon covers with gas capture
• Renewable natural gas (RNG) production facilities
• Landfill leachate treatment and biogas recovery
• Brewery and distillery waste digestion systems
• Co-digestion facilities handling mixed organic feedstocks

Why Contractors and Engineers Specify Plastic Fusion

• 40+ years in environmental containment — pioneer in anaerobic digester lagoon cover systems
• Certified thermoplastic welders trained in HDPE, XR-5, RPP, PVC, and polypropylene
• In-house HDPE fabrication shop for custom gas piping, manifolds, penetrations, and fittings
• Material selection matched to gas chemistry — H₂S concentration, operating temperature, UV exposure
• Gas-tight seam welding with full destructive and non-destructive QA/QC testing
• Complete biogas system integration — cover, piping, condensate, pressure control, flare tie-in
• Nationwide mobilization with experienced field crews
• Direct coordination with engineers, developers, and regulatory inspectors
• Ongoing maintenance and repair services to protect your cover investment long-term

Industries Served

Plastic Fusion installs biogas collection covers for municipal utilities, wastewater treatment districts, dairy and livestock operations, food and beverage processors, renewable energy developers, landfill operators, and industrial facilities managing organic waste streams. We work under EPA, state air quality, and NSPS/NESHAP regulations — and we deliver the documentation your compliance team and project investors require.

Biogas Collection Cover FAQs

What is a biogas collection cover?

A biogas collection cover is a gas-tight geomembrane system installed over an anaerobic digester, lagoon, or tank to capture the biogas produced during organic waste decomposition. The cover prevents methane and other gases from escaping into the atmosphere while channeling them through a collection system to a flare, combined heat and power (CHP) unit, or RNG upgrading facility. Covers are typically fabricated from HDPE, XR-5, or reinforced polypropylene — materials chosen for their resistance to the corrosive gas mix (methane, CO₂, H₂S) present in anaerobic digestion systems.

What is the difference between a biogas tank cover and a biogas pond cover?

Biogas tank covers are rigid or semi-rigid membrane systems designed for concrete or steel digesters with defined geometry and fixed dimensions. They’re typically tensioned or mechanically fastened to the tank walls. Biogas pond covers — also called floating covers — are flexible geomembrane systems that float directly on the liquid surface of a lagoon or earthen basin, rising and falling with liquid levels. Floating covers require ballast systems, rainwater drainage, and perimeter anchoring engineered for the specific lagoon geometry. Plastic Fusion installs both configurations and selects the cover type, material, and attachment method based on your system design.

How does a biogas collection system work with the cover?

The cover captures gas in the headspace between the membrane and the liquid surface. Gas collection piping — typically HDPE headers and laterals — routes the captured biogas to a central manifold, through condensate traps to remove moisture, and then to utilization equipment (flare, engine-generator, or RNG upgrader). Pressure and vacuum relief valves maintain safe operating conditions under the cover. The entire system — cover, piping, condensate management, and tie-ins — must be designed and installed as an integrated unit to prevent leaks, maintain gas quality, and ensure consistent flow to downstream equipment.

What materials are used for biogas covers?

The three most common geomembrane materials for biogas collection covers are HDPE (high-density polyethylene), XR-5 (a reinforced ethylene interpolymer alloy), and RPP (reinforced polypropylene). HDPE offers excellent chemical resistance and is the most widely specified for standard digester and lagoon applications. XR-5 provides superior flexibility and is often selected for floating cover applications where the membrane must conform to changing liquid levels. RPP delivers high puncture resistance and UV stability. Material selection depends on gas chemistry (especially H₂S concentration), operating temperature range, UV exposure, and whether the cover is floating or fixed-mount.

Can biogas covers be installed on existing lagoons or tanks without shutting down operations?

In many cases, yes. Floating biogas covers can be deployed over an active lagoon without draining the basin, and tank covers can often be installed during scheduled maintenance windows rather than full shutdowns. Plastic Fusion has installed biogas collection covers on operating dairy lagoons, active municipal digesters, and running wastewater treatment systems — coordinating with facility operators to maintain production while completing the installation safely.

How long do biogas collection covers last?

Properly installed HDPE and XR-5 biogas covers typically deliver 20+ years of service life when the material is correctly specified for the gas chemistry and environmental conditions. The primary factors affecting longevity are H₂S concentration (which can degrade certain materials over time), UV exposure on exposed covers, mechanical stress from wind and rain loading, and the quality of the original seam welding. Plastic Fusion’s QA/QC protocols — including destructive peel and shear testing on every seam — are designed to maximize the installed lifespan of every cover system we build.

Request a Quote

If you’re developing, expanding, or retrofitting a biogas collection system, Plastic Fusion is ready to deliver a cover solution engineered for your specific application. Contact us for project-specific pricing, material recommendations, and installation timelines — whether it’s a single digester tank cover or a multi-lagoon RNG facility.