Cargo tank pressure is monitored on tankers:
Direct Answer
Option A: To ensure IG backpressure is slightly positive at all times
Maintaining a slightly positive inert gas pressure within cargo tanks prevents the ingress of atmospheric oxygen, crucial for fire and explosion prevention. This positive pressure, typically 100-200 mmWG, ensures the tank atmosphere remains below the cargo's Lower Flammable Limit (LFL), as mandated by SOLAS and detailed in ISGOTT.
All Options
Detailed Explanation & Context
Maintaining a slightly positive inert gas pressure within cargo tanks prevents the ingress of atmospheric oxygen, crucial for fire and explosion prevention. This positive pressure, typically 100-200 mmWG, ensures the tank atmosphere remains below the cargo's Lower Flammable Limit (LFL), as mandated by SOLAS and detailed in ISGOTT.
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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