Wärtsilä Moss Mult-Inert Systems - Wärtsilä Inert Gas Systems
Home Marine Products and solutions Gas solutions Inert gas systems Wärtsilä Mult-Inert™ Systems Wärtsilä Mult-Inert™ Systems The Wärtsilä Mult-Inert system combines a flue gas system and an inert gas generator to offer maximum flexibility onboard product tankers transporting petroleum products. Wärtsilä Mult-Inert™ systems are vital systems ensuring a high level of safety for use onboard tankers intended to carry both crude oil and refined products, and combine into one compact unit where quality is the number one priority. The Wärtsilä Mult-Inert™ system can run as an inert gas generator or, when the boilers are in use, as a flue gas system. They are designed based on compact modules, offering important savings in space and installation cost for newbuild and retrofit vessels. What is Inert Gas? Inert Gas is a gas or a mixture of gases, such as flue gas, containing insufficient oxygen to support the combustion of hydrocarbons. An Inert condition is a condition in which the oxygen content throughout the atmosphere of a tank has been reduced to 8% or less by volume. Spare Parts and Service Please send the vessel name, equipment type, serial number (if known), your company details and spare parts requirements to moss-spares@wartsila.com or service requirements to moss-service@wartsila.com and we will respond as soon as possible. Wärtsilä Marine. Let's connect. Contact us
Components & Design
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Technical Data
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Common failures & inspection points
Visual inspection through man-holes for sludging, corrosion damage, deposits; check nozzles, cooling tubes, floats, sensors, demister elements. Inspection frequency 6-12 months (doubled under critical conditions). Drydock entrance inspectable (scrubber discharge line).
Periodic test & cleaning of inert gas sample line to O₂ analyser (critical service position). Analyser itself: 2-point calibration (Zero-Gas N₂ 0%, Span-Gas known O₂ concentration) before operation. Calibration accuracy per manufacturer. Alarm setting: >8% O₂ volume.
Check water supply (min. 2 separate pumps required). Visual inspection water level (equipped with low-level alarm). Inspection PMS interval per manufacturer; special attention during IG system shutdown. Check for blockage/corrosion at openings.
Check flame screens/meshes (replacement per PMS plan). Calibration for required pressure values + test at operating pressure. Liquid-filled breakers: check fluid type & level; check anti-freeze additive in case of frost risk. Labelling with opening pressures & fluid type/concentration + min. operating temperature.
Ventil zur Inspection öffnen. Prüfung auf Korrosion, Ventilsitz-Zustand, freie Ventilbewegung über volle Hublänge. Betriebsprobe im Service durchführen. Mindestens zwei Rückschlagvorrichtungen erforderlich (Deck Seal + Isolierventil). Kritisch für Hydrokarbon-Rückfluss-Verhinderung in Maschinenraum.
Access to combustion chamber via hinged front (tool-free accessible — check for wear). Flue gas & recirculation valves regularly stroked (stroke test) when system out of service — ensure free operation over full stroke range. Inspection frequency per operating frequency.
Type-general inspection and maintenance points for this equipment category — not model-specific.
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