Wärtsilä Moss Inert Gas Generator - Tanker Series
Wärtsilä Moss (successor to Kvaerner/Hamworthy) Wärtsilä Moss Inert Gas Generator - Tanker Series — Modern product and crude oil tanker inerting (retrofit & newbuild).
Inspector Detail
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Common issues
- Burner/combustion chamber fouling or misadjustment causing poor combustion and high CO or O2 excursions
- Scrubber/cooling tower seawater spray nozzle blockage reducing gas cooling and washing efficiency
- Deck seal or water seal fouling, or low water level, compromising the non-return function
- Blower/fan bearing wear and vibration
- O2 analyser drift requiring frequent recalibration
- Corrosion in the gas ducting/scrubber from acidic combustion products
Inspection checklist
- O2 analyser calibration and function test before each use
- Deck seal water level and non-return valve function check
- Scrubber spray nozzle inspection/cleaning
- Combustion chamber and burner inspection
- Blower bearing vibration/temperature check
- Gas ducting corrosion/thickness spot check
- High-O2 and low-water-level alarm and trip function test
Service intervals
| O2 analyser calibration | before each use and periodically per maker schedule |
| Deck seal inspection and topping up | before each use |
| Scrubber cleaning | per maker schedule or performance trend, typically every few months of active use |
| Burner/combustion chamber overhaul | annually or per running hours per maker guidance |
| Blower bearing service | per maker's hour-based schedule |
Critical spares
- Burner nozzle/igniter assembly
- Scrubber spray nozzles
- O2 analyser sensor cell
- Deck seal non-return valve internals
- Blower bearings
Safety
- Inert gas system failure risks an explosive atmosphere in cargo tanks - O2 content and deck seal integrity are safety-critical
- Combustion gas contains CO - ventilation and gas detection required around the unit
- Hot surfaces at the burner/combustion chamber
- Deck seal must never be bypassed while inerting is in progress
Class survey
Inert gas systems on tankers are subject to periodical survey including function tests of the O2 analyser, deck seal, and low-pressure/high-O2 alarms, typically verified at each annual survey per SOLAS/class requirements for the inert gas system.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Verify deck water seal and block/bleed valves operate correctly to prevent petroleum gas or liquid returning to machinery spaces; test one-way function weekly under operational conditions
Inspect IGG oxygen analyzer sampling lines for carbon deposits quarterly; clear any obstruction; ensure PMS includes periodic sampling pipe cleaning (critical missed maintenance item)
Verify continuous water supply to deck water seal; check water level daily; test pressure alarms and trip settings monthly; inspect seal integrity for leaks or corrosion
Inspect burner fuel nozzle for carbon buildup semi-annually; check scrubber demister element for scaling and corrosion; verify fan discharge pressure meets design specifications
Calibrate oxygen analyzer quarterly against reference gas (standard 3% O₂); confirm actual IGG output is ≤5% O₂ during cargo operations; document all measurements in engine log
Type-general inspection and maintenance points for this equipment category — not model-specific.
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