Definition
An inert gas system reduces oxygen concentration in cargo tanks by supplying non-combustible gas, lowering the risk of fire or explosion in flammable atmospheres.
Why it matters
For tankers and chemical carriers, IGS is a central explosion-prevention barrier. Reports often discuss it when cargo tank atmosphere control failed, was unavailable, or was used in a way that worsened a casualty.
Investigation relevance
- Whether the system was fitted and operational
- Whether oxygen levels were maintained within safe limits
- Whether crew procedures matched the cargo risk
- Whether pressure changes or incorrect use affected cargo leakage or fire behavior
Related
- Severity Classification
Related incidents
Accidents linked to this concept are grouped by vessel type.