Why must cargo tanks be cooled down gradually before loading cryogenic liquid cargo?
Direct Answer
Option D: Prevent excessive thermal stress and deformation of tank structure and pumps
Gradual cooldown is mandatory to prevent brittle fracture and excessive thermal stress. Rapid temperature changes induce severe contraction in tank materials and pumps, potentially leading to structural failure or mechanical damage. This procedure is a critical safety requirement outlined in SIGTTO’s Liquefied Gas Handling Principles.
All Options
Detailed Explanation & Context
Gradual cooldown is mandatory to prevent brittle fracture and excessive thermal stress. Rapid temperature changes induce severe contraction in tank materials and pumps, potentially leading to structural failure or mechanical damage. This procedure is a critical safety requirement outlined in SIGTTO’s Liquefied Gas Handling Principles.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Liquefied Gas Tanker Cargo Operations (GASCO).
Practice Full GASCO Set 1
Test yourself with 30 interactive questions, live timer, and instant score.