Biogas & Biomethane sector

Specialised components for biogas production and biomethane upgrading: from anaerobic digestion to grid injection. A strategic sector boosted by PNRR funding.

A rapidly growing sector

Biogas and biomethane represent one of Italy's most strategic renewable energy pathways. PNRR funding (National Recovery and Resilience Plan) has allocated significant resources for new plants and conversions, driving growing demand for specialised components.

Roffia supports designers, installers and plant operators with a complete range of valves, pipes, fittings and accessories suited to biogas-specific challenges: H₂S corrosion, low-pressure gas sealing and ATEX compliance.

Gate valves for digestate

Rubber-seated ductile iron gate valves for isolating digestate lines. H₂S-resistant elastomers. DN 50-600.

PE pipes and fittings

PE 100 and PE 80 pipes for biogas and digestate transport, with complete PE fittings: elbows, tees, reducers, couplers and compression fittings. Butt fusion and electrofusion joints for gas-tight sealing. PE is ideal for biogas plants as it is immune to H₂S corrosion, lightweight and flexible. Available in SDR 11, SDR 17 and SDR 17.6, compliant with EN 12007 and EN 1555 for combustible gases.

ATEX ball valves

Fire-safe, antistatic ball valves in stainless or carbon steel. PTFE-filled or PEEK seats for H₂S resistance. ATEX-certified actuators for classified zones.

Heat exchangers

Plate and shell-and-tube exchangers for digester heating (mesophilic/thermophilic) and CHP thermal recovery. 316L stainless for digestate resistance.

Safety valves

Over/under-pressure protection for digesters and gasholders. PED-certified relief valves.

Pumps for digestate

Submersible and centrifugal pumps for digestate handling, substrate feeding and storage tank drainage.

Knife gate valves

Knife gate valves for isolating digestate, sludge and fibrous substrates at digester inlets. The through-going blade design cuts fibrous solids, preventing blockages. Cast iron or stainless steel body, bidirectional elastomer seal. Manual, pneumatic or electric actuation. DN 50 to DN 600, ideal for high dry-solids content fluids.

PNRR opportunities

Italy's PNRR has allocated significant funding for biomethane production from agricultural waste and OFMSW (Organic Fraction of Municipal Solid Waste). New dedicated plants and biogas-to-biomethane conversions are generating strong demand for certified components. Roffia is ready to support this growth with stocked inventory and qualified technical assistance.

Domande frequenti

What valves are needed for a biogas plant?
Key valves include: gate valves with rubber-seated wedge for digestate lines, ATEX fire-safe ball valves for gas lines, PED safety valves for digester and gas holder protection, and control valves for pressure regulation. All components in contact with biogas must resist H2S (hydrogen sulphide) — PTFE or PEEK seats and stainless steel bodies are used.
What is the difference between biogas and biomethane?
Biogas is the raw gas from anaerobic digestion, composed of approximately 50-65% methane and 35-50% CO2, plus traces of H2S and water vapour. It is typically burned in a CHP unit. Biomethane is purified biogas (upgrading) to over 97% methane, suitable for grid injection or vehicle fuel. Upgrading requires additional components: scrubbers, membranes, compressors and fine regulation valves.
Does Roffia supply biogas plant components?
Yes. Roffia srl based in Cremona — in the heart of the Po Valley, Italy most concentrated biogas region — supplies valves, polyethylene pipes, fittings, heat exchangers and instrumentation for biogas and biomethane plants. We serve projects throughout Lombardy, Emilia-Romagna and all of Northern Italy with fast delivery.
Why use polyethylene (PE) pipes and fittings in biogas plants?
Polyethylene pipes (PE 100 and PE 80) are ideal for biogas and digestate lines because they are completely immune to corrosion from H₂S and CO₂, unlike steel. They are lightweight, flexible and easy to install with butt fusion or electrofusion joints that guarantee gas-tight sealing. The complete PE fittings range — elbows, tees, reducers, couplers — allows complex layouts without metallic flanges. PE pipes for gas must comply with EN 1555 and EN 12007. Roffia supplies PE pipes in SDR 11, SDR 17 and SDR 17.6 with matched fittings, stocked in Cremona.
What are knife gate valves used for in biogas plants?
Knife gate valves are essential in biogas plants for isolating dense, solids-laden fluids such as digestate, slurry, sludge and fibrous substrates. Their through-going blade design cuts fibres and solids, preventing the blockages that would occur with conventional ball or gate valves. They are typically used on digester feed lines, digestate outlet piping and storage tanks. Available in cast iron or stainless steel, bidirectional elastomer seal, manual, pneumatic or electric actuation. Roffia supplies knife gate valves from DN 50 to DN 600, suitable for fluids with up to 15-20% dry solids content.

Planning a biogas plant?

Contact us with your project specs: size, substrates, valorisation type (CHP or biomethane). We support you from component selection to delivery.

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