Inert Gas Generator Services

Marine inert gas generator service is the work scope that keeps an IGG unit producing tank-inertion gas across the cargo cycle on oil, chemical, and gas carrier tonnage - the newbuild commissioning that brings a fresh installation online, the annual class-witnessed performance test that confirms the unit still meets SOLAS Chapter II-2 Regulation 4 requirements, the scrubber cleaning that recovers gas conditioning efficiency, the burner combustion tuning that holds O2 setpoint inside class limits, the refractory inspection and repair that protects the combustion chamber, and the drydock-window overhaul work that resets a worn IGG back to baseline performance. An IGG that fails the witnessed test is an IGG that costs the operator cargo days, and cargo days lost on a chartered tanker cost orders of magnitude more than the service intervention that would have caught the problem in advance.

Service providers covering this scope handle the work that no spare-part supplier can ship in a box - on-board commissioning of a newly installed generator, periodic scrubber chemical cleaning and water seal inspection, burner refurbishment with combustion-tuning verification, refractory hot work and brick replacement at end of campaign, witnessed O2 and pressure capacity testing at the annual class survey, and the troubleshooting work when the unit fails to start or fails to hold O2 setpoint during cargo operations. The right service company arrives with trained technicians, class-recognised methodology, and the documentation that holds at periodical survey witnessing.

What IGG Service Covers Onboard

The work scope across a marine inert gas generator breaks into a defined set of recurring and condition-driven interventions:

• Newbuild commissioning and harbour acceptance test - first start-up after installation, combustion tuning to design O2 setpoint, capacity verification at design loading rate, alarm and shutdown function test, and the HAT report that the class surveyor witnesses before entry to service.
• Annual class-witnessed performance test - the periodic test the flag administration and class society require - O2 content at the scrubber outlet, pressure capacity at maximum cargo loading rate, alarm and shutdown verification, deck water seal integrity, and the witnessed report that supports the Safety Equipment Certificate.
• Scrubber cleaning and water-side service - removal of accumulated sediment from the scrubber sump, chemical cleaning of spray nozzles and packing where scaling has developed, deck water seal inspection and refill, and the seawater piping inspection that catches early-stage corrosion.
• Burner refurbishment and combustion tuning - removal and overhaul of burner head, cup or nozzle replacement, ignition system service, and the post-overhaul combustion tuning that holds O2 setpoint inside the class limit across the loading range.
• Refractory inspection and repair - visual inspection of combustion chamber refractory at planned intervals, hot-spot detection during operation, partial brick replacement on localised damage, and complete refractory renewal at end of campaign.
• O2 analyzer calibration and sensor replacement - calibration verification against reference gas, sensor cell replacement when calibration drift exceeds tolerance, and the documentation update that the class surveyor reviews at survey.
• Nitrogen PSA service scope - air pre-treatment service, valve overhaul on the high-cycle PSA valves, molecular sieve testing and replacement at end of bed life, and N2 purity verification under operating conditions.

Before commissioning and service work begins, the IGG unit itself has to be on board - inert gas generator suppliers handle the equipment-side procurement of complete packages, newbuild installations, and retrofit upgrades.

In-Situ vs Drydock Work Scope

Work on the IGG splits across two operational windows. Afloat scope - performance testing during port stays and anchored periods, scrubber cleaning that doesn't require IGG isolation, burner combustion tuning, O2 analyzer calibration, and the troubleshooting work when the unit shuts down on alarm during cargo operations. Most annual class-witnessed testing happens afloat at port between cargo operations, with the surveyor witnessing the alarm and shutdown chain plus the pressure and O2 capacity at simulated load. Drydock scope - complete IGG overhaul work that needs the unit isolated, the deck distribution main opened, and access to internals - combustion chamber refractory replacement, scrubber tower internal cleaning and repair, demister pad renewal, blower overhaul with rotor balance, and the full hydrostatic and pneumatic re-test before re-entry to service. The service provider that covers both windows - afloat condition monitoring and drydock intervention - lets the operator plan IGG work against actual condition rather than the conservative class interval.

Combustion Tuning and O2 Setpoint Control

Combustion tuning is the centerpiece of marine IGG service quality. The IGG produces inert gas with O2 content driven by the combustion air-to-fuel ratio - rich combustion (excess fuel) produces low O2 but unstable flame and high soot generation; lean combustion (excess air) produces high O2 above the SOLAS limit and risks unsafe atmosphere in cargo tanks. Optimal tuning holds O2 at the design setpoint (typically 1 to 3% at the scrubber outlet) across the full cargo loading range, which means the burner has to modulate combustion air with fuel flow as the IGG output capacity changes. Tuning involves combustion analyzer measurement at multiple load points, burner mechanical adjustment (cup position, air register vanes, fuel pressure), O2 analyzer feedback loop calibration, and the alarm setpoint verification that triggers shutdown if the O2 limit is exceeded. A well-tuned IGG delivers stable inert gas throughout cargo operations; a poorly-tuned IGG either fails to meet O2 specification or fails to maintain capacity at peak loading rate.

Brand Specialist Service

Brand specialists matched to the installed equipment OEMs dominate the service provider population:

• ALFA LAVAL Smit service network - authorised commissioning, overhaul, and annual test scope on Smit Gas IGG installations worldwide.
• HAMWORTHY (Wartsila) service - factory-authorised service on Hamworthy Moss installed base, with the Wartsila global service network supporting older units across forward years.
• KANGRIM service - OEM-authorised commissioning and overhaul on Korean-built IGG units.
• Atlas Copco service - PSA generator commissioning, valve service, and molecular sieve replacement.
• Survitec, Ocean Clean - independent IGG service specialists with strong brand recognition on Smit and Hamworthy installed base.
• Kashiwa Tech Co, Feen Marine, Fuji Electric, CLARKE CHAPMAN - regional service channels covering specific OEM scope and territorial markets.

Brand-authorised service matters where the OEM type approval requires authorised personnel and certified methodology for the witnessed test report to hold at class survey.

Class Approval and Survey Witness Scope

Service work on this equipment sits within the Safety Equipment Certificate scope under SOLAS Chapter I/14, with periodical survey witnessing under SOLAS Chapter II-2 Regulation 4. The class surveyor witnesses the annual IGG performance test - O2 content verification at the scrubber outlet, pressure capacity at maximum design load, alarm and shutdown function across the critical interlocks, deck water seal integrity, and the documentation chain covering any equipment changes during the survey period. IACS member societies - DNV, ABS, Lloyd's Register, Bureau Veritas, ClassNK, RINA, KR, CCS - witness the test and sign off the certificate scope, with non-IACS bodies (HRS, INSB Class, RMRS) covering specific flag administrations. The service provider produces the test report, the calibration records, the maintenance log, and the OEM authorisation chain that the class society's recognition framework requires.

Selecting an IGG Service Provider

When you shortlist marine inert gas generator service companies, weigh the structural evidence on each profile rather than the marketing surface:

• Class society recognition matched to vessel registry - IACS member acceptance (DNV, ABS, Lloyd's Register, Bureau Veritas, ClassNK, RINA, KR, CCS) for witnessed performance testing; non-IACS bodies for specific flag administrations. Without recognition the test report won't hold at survey.
• OEM brand authorisation - Alfa Laval Smit, Hamworthy/Wartsila, KANGRIM, Atlas Copco authorised channels for the specific IGG installed on the vessel. Authorised methodology is required where the OEM type approval demands it.
• Combustion tuning equipment and methodology - portable combustion analyzers, O2 reference gas, calibration documentation, and the trained personnel who can hold O2 setpoint across the full IGG operating range.
• Refractory work capability - in-house refractory specialists or established workshop partnerships covering combustion chamber inspection, partial brick replacement, and complete refractory renewal at end of campaign.
• Riding team mobilisation capability - trained technicians mobilised to the vessel's port, anchorage, or drydock yard on short notice when the IGG fails during cargo operations or before a scheduled cargo load.
• Regional service network matched to tanker itinerary - authorised personnel in the ports and drydock yards the fleet uses (Singapore, Rotterdam, Dubai, Piraeus, Shanghai, Mumbai, Houston, Tuzla), with rapid response under cargo operation pressure.

Service companies worth shortlisting deliver class society recognition matched to vessel registry, OEM brand authorisation matched to the installed IGG, combustion tuning equipment and methodology, refractory work capability, riding team mobilisation under operational pressure, and regional service network coverage matched to the trading pattern. Component renewals identified during overhaul - burner assemblies, scrubber spray nozzles, demister pads, refractory bricks, O2 analyzer cells, control panel modules - feed into the IGG spare parts track rather than direct OEM purchasing.