MOSS Inert Gas System 4500
Kvaerner / Hamworthy Moss (now Wärtsilä Moss) MOSS Inert Gas System 4500 — Oil and product tanker cargo tank inerting.
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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