Why must cargo pumps and pipelines be thoroughly blown down with air/N2 after cargo discharge?
Direct Answer
Option C: Clear liquid pockets from piping to prevent contamination and line freezing
Blowing down cargo lines with air or N2 after discharge clears residual liquid. This prevents contamination of future cargoes, avoids potential line freezing in cold weather, and ensures pipelines are safe and ready for the next operation, as per standard chemical tanker practice.
All Options
Detailed Explanation & Context
Blowing down cargo lines with air or N2 after discharge clears residual liquid. This prevents contamination of future cargoes, avoids potential line freezing in cold weather, and ensures pipelines are safe and ready for the next operation, as per standard chemical tanker practice.
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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