Why is it necessary to cool down cargo tanks (refrigerated ships) during bulk loading
Direct Answer
Option D: To avoid excessive tank pressure
Cooling down cargo tanks is essential to prevent thermal shock and excessive pressure buildup caused by the rapid vaporization of warm cargo. By gradually lowering the temperature, the vessel ensures the tank material remains within its design limits and prevents the boil-off gas rate from exceeding the capacity of the reliquefaction plant.
All Options
Detailed Explanation & Context
Cooling down cargo tanks is essential to prevent thermal shock and excessive pressure buildup caused by the rapid vaporization of warm cargo. By gradually lowering the temperature, the vessel ensures the tank material remains within its design limits and prevents the boil-off gas rate from exceeding the capacity of the reliquefaction plant.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Liquefied Gas Tanker Cargo Operations (GASCO).
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