LGTCO/LGTF Exit Exam • Set 2 Question 23 of 30
What is the function of a thermal relief valve fitted on liquid gas lines?
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Direct Answer
Option B: Relieve small liquid expansion pressure when trapped between closed line valves
Thermal relief valves mandated by the IGC Code relieve hydraulic over-pressurization caused by ambient heat absorption into trapped liquid cargo between closed pipeline block valves, protecting piping integrity.
All Options
A
Pump bilges
B
Relieve small liquid expansion pressure when trapped between closed line valves
(Correct Answer)
C
Cool main engine
D
Measure depth
Detailed Explanation & Context
Thermal relief valves mandated by the IGC Code relieve hydraulic over-pressurization caused by ambient heat absorption into trapped liquid cargo between closed pipeline block valves, protecting piping integrity.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Liquefied Gas Tanker Cargo Operations (LGTCO/LGTF).
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