š Key Concepts
ā¢ 46 CFR requirements for inert gas systems on tank vessels
ā¢ Purpose of measuring oxygen, pressure, and temperature in the inert gas main
ā¢ Location of gas regulating valve, blower, scrubber, and deck water seal/liquid breaker in a typical inert gas system flow diagram
š Think About
ā¢ In a standard inert gas system flow path from boiler uptake to cargo tanks, what is the order of the main components (scrubber, blowers, regulating valve, deck water seal/liquid breaker)?
ā¢ At what single point will oxygen, pressure, and temperature best represent the actual quality and safety of the gas being delivered to the cargo tanks?
ā¢ Which locations in the answer choices are still subject to changes or disturbances before gas reaches the deck main, and which location gives a stable, representative sample for the whole system?
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Before You Answer
ā¢ Sketch or visualize the piping sequence of a typical inert gas system from source to cargo tanks and label each component
ā¢ Confirm which component (from the options) is common to all gas going to deck and is upstream of any safety/water seal devices protecting cargo tanks
ā¢ Verify in 46 CFR inert gas system rules where instruments must measure: is it specified relative to the scrubber, blowers, regulating valve, or deck seal/liquid breaker?