During loading and discharging operation in addition o when the cargo tanks have been properly filled each inert gas system must be capable of maintaining a minimum gas pressure of
Direct Answer
Option C: 100 millimeters of water pressure
As per SOLAS Chapter II-2 and ISGOTT, an inert gas system must maintain a minimum positive pressure of 100 millimeters of water gauge (WG) in cargo tanks. This prevents the ingress of atmospheric air, ensuring the tank atmosphere remains below the oxygen threshold for combustion, thereby preventing fire or explosion.
All Options
Detailed Explanation & Context
As per SOLAS Chapter II-2 and ISGOTT, an inert gas system must maintain a minimum positive pressure of 100 millimeters of water gauge (WG) in cargo tanks. This prevents the ingress of atmospheric air, ensuring the tank atmosphere remains below the oxygen threshold for combustion, thereby preventing fire or explosion.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).
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