Onboard Membrane Nitrogen Unit

Onboard membrane nitrogen unit – a compact, onboard solution for generating high-purity nitrogen directly at the point of use. Unlike traditional cryogenic or PSA systems, this unit leverages selective permeation through hollow-fiber membranes to separate nitrogen from compressed air, delivering a continuous, dry, and oil-free nitrogen stream with minimal moving parts and virtually no consumables.

How It Works

The core principle is simple yet refined: compressed, filtered air flows through thousands of asymmetric membrane fibers. Oxygen, water vapor, and trace gases permeate through the fiber walls faster than nitrogen, vented as waste. The slower-moving nitrogen is collected at the outlet. By adjusting feed pressure and flow, operators can tune purity on the fly – typically from 95% to 99.5%, depending on the application.

Performance at a Glance

Energy & Efficiency

Specific power consumption stands at 0.15 – 0.25 kW/Nm³@95% purity, scaling inversely with purity level. The onboard membrane nitrogen unit requires only 5.5 – 7.5 bar(g) inlet pressure, meaning it can often run directly off an existing plant air compressor without extra boosting. No regeneration heat, no purge loss – just steady, low-energy separation.

Key Technical Specifications

• Inlet air quality: ISO 8573-1 Class 1.2.1
• Operating pressure: 6 – 10 bar(g)
• Dew point outlet: ≤ -40°C (at atmospheric pressure)
• Membrane life: >10 years under normal operating conditions
• Control: PID-based with local HMI and remote RS485/Modbus
• Materials: anodized aluminium housings with stainless steel fittings

Industrial Applications

This system is widely deployed in:

• Chemical inerting – blanketing reactors and storage tanks to prevent oxidation.
• Food & beverage – packaging and sparging (without using specific case names).
• Pharmaceutical – transfer lines and fermentation headspace.
• Electronics – wave soldering and component storage.
• Marine & offshore – fuel gas inerting and cargo tank blanketing.

All applications benefit from the unit's compact footprint and instant start-stop capability, eliminating the lag of liquid or cylinder supply.

Certifications & Standards

Each onboard membrane nitrogen unit is designed and factory-tested to meet:

• CE (PED 2014/68/EU)
• ASME Section VIII (optional)
• ATEX for hazardous zones (optional)
• ISO 9001 & ISO 14001 manufacturing protocols

All pressure components undergo 100% hydrostatic testing and helium leak checks prior to dispatch.

Customization & Engineering

We offer plug-and-play skids with customised piping layouts, control logic, and dual‑membrane redundancy. Options include outdoor weatherproof enclosures, explosion-proof electricals, and integrated oxygen analysers with 4‑20 mA output. Our in-house engineering team can tailor the onboard membrane nitrogen unit to fit tight footprints, variable ambient conditions, or specialised material requirements – all supported by full 3D CAD integration and factory acceptance testing (FAT) witnessed by clients.

Service & Lifecycle Support

Remote diagnostics, predictive maintenance alerts, and real‑time performance tracking are embedded in the PLC. Spare fibre cartridges, pre‑filters, and solenoid valves are stocked regionally to ensure <48‑hour emergency response. We also provide operator training, on‑site commissioning, and annual performance verification to keep your onboard membrane nitrogen unit running at peak efficiency over its entire service life.

Why This Technology Stands Out

No chemical absorbents, no rotating seals, and no thermal cycling – just reliable, membrane‑based separation. The absence of moving parts in the fibre bundle translates to lower vibration, quieter operation, and drastically reduced maintenance intervals. It's a set‑and‑forget solution that integrates seamlessly with existing plant air networks, turning compressed air into a strategic on‑demand resource.

At Shenger Gas, we combine deep‑rooted membrane engineering with real‑world process knowledge to deliver nitrogen systems that aren't just specified – they're validated. Every onboard membrane nitrogen unit leaving our workshop carries a performance test report, a full material traceability package, and a commitment to continuous improvement. We don't just sell equipment; we provide gas‑phase peace of mind, backed by a team that understands both the chemistry and the machine. For a partnership built on precision, reliability, and long‑term value – we're here to engineer your nitrogen future.

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