N2 Generator 25m3h 99% Marine
Mahler AGS Inert Gas Systems. Mahler AGS NITROSWING PSA nitrogen generators produce inert gas (N2 95-99.99%) from ambient air using pressure swing adsorption (PSA) technology with carbon molecular sieve (CMS) adsorbent. Capacity 200-4,000 Nm³/h. Hauptanwendung auf modernen Schiffen (Öltanker, Chemikalientanker) zur Cargo-Tank-Inertisierung (Explosionsschutz, O2 unter 8%). Volla
Inspector Detail
▸
Common issues
- Membrane fibre fouling from oil aerosol carryover in the feed air
- Reduced nitrogen purity as membrane fibres degrade with age or contamination
- Coalescing/particulate pre-filter elements clogging, restricting feed air and derating output
- Condensate in the feed air line from inadequate air drying upstream
- Feed air compressor performance drop reducing achievable purity/flow together
- High feed air temperature reducing membrane separation efficiency
Inspection checklist
- Check feed air pressure and temperature are within the membrane's rated range
- Verify pre-filter differential pressure and replace elements per schedule
- Confirm the O2 analyzer reading is calibrated and within the required setpoint before use
- Inspect the feed air dryer/coalescer for correct operation with no liquid carryover
- Check for oil staining at pre-filter housings, indicating compressor oil carryover
- Verify membrane module inlet/outlet pressures against the commissioning baseline
Service intervals
| Pre-filter (particulate/coalescing) element replacement | typically 2,000-4,000 running hours or per differential pressure, whichever comes first - confirm against manufacturer schedule |
| O2 analyzer calibration/check | typically 6-12 months per manufacturer schedule |
| Feed air compressor service (if a dedicated unit) | per compressor manufacturer schedule |
| Membrane module performance check vs baseline | annually |
Typical wear limits
| Achievable N2 purity at rated flow | if purity falls noticeably below the rated level with pre-filters known good, membrane replacement is normally indicated - confirm against manufacturer trend criteria rather than a single low reading |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Pre-filter/coalescing filter element set
- O2 analyzer sensor cell
- Feed air dryer desiccant or coalescer element (if fitted)
- Solenoid valves and pressure regulators in the feed air train
Safety
- The system delivers an oxygen-depleted atmosphere - treat the discharge space/tank as an asphyxiation hazard and follow enclosed space entry procedures
- Never enter a nitrogen-inerted space without gas-freeing and atmosphere testing, regardless of how long the generator has been off
- The feed air system operates under pressure; isolate and vent before filter or module work
- Oil carryover from a contaminated feed air compressor can foul the membrane and is also a fire risk at the compressor
Class survey
Where the unit serves a class-required inerting function (e.g. cargo tank inerting), class checks O2 analyzer calibration records, alarm setpoints, and that the required inert atmosphere is maintained - confirm the exact survey scope against this vessel's class notation, since requirements differ between a class-required IG system and a general-purpose N2 generator.
Components & Design
Component data being added…
Technical Data
🤖 Ask about this model
One free question — answered like a marine engineer. No account needed.
Common failures & inspection points
Annual full inspection: Check CMS bed condition, verify no moisture exposure (degrades sieve lifespan 10+ years; oil contamination reduces lifespan significantly); quarterly checks of N2 purity/flow rate and sieve replacement need. Pre-filters for moisture/oil removal must be inspected and replaced timely.
Periodic inspection and CLEANING of O2 analyzer sampling pipes (at least twice yearly per updated procedures after carbon deposit incidents) to prevent partial clogging. Verify sampling line integrity, check for carbon deposits from IGG scrubber. Analyzer must trigger alarm at O2 > 8%.
Internal inspection of deck seal: check Venturi non-return valves/orifice plates for corrosion/damage (excessive water carryover to tanks); inspect inlet pipe/housing for corrosion/cracks; check heating coil condition. In cold weather zones, verify deck seal heating system operational. Test seal alarms.
Check activated carbon tower for oil/moisture/foreign material accumulation (activated carbon prevents contaminants entering PSA unit). Inspect air dryer & filter units functionality. Replace pre-filters according to maintenance schedule if lubricated air is used. Monitor pressure drop across filters.
Pre-operation inspection (especially cold weather): check P/V valve weight mechanism for freeze-in/sticking to seat. Verify non-return valve function to prevent cargo tank backflow. Test automatic shut-down systems. Confirm valve operability before each voyage commencement.
Annual inspection of dual adsorption towers (filled with CMS) for structural integrity, corrosion, or damage. Verify tower seals/connections integrity. Check product quality downstream (N2 purity/flow); if degraded, towers may need CMS bed replacement. Pressure test vessels per classification society rules.
Type-general inspection and maintenance points for this equipment category — not model-specific.
Suppliers & Spare Parts
Direct links to manufacturer, datasheet, spare-parts portal and dealers — request access below.
📄 Request sourcing links & documentsCases, daily reports, timesheets and AI troubleshooting in the OceanSphere Marine app — free for 14 days.
Start free trial →Find manufacturers, repair shops and spare-part dealers in the Maritime Network — our global company directory.
Maritime Network →