Inert gas systems fitted on tank vessels...

Question 1 of 270705eccef9dbacbc34ba4d45cf9

Inert gas systems fitted on tank vessels must be fitted with an alarm to give an audible and visual warning when the oxygen content of the inert gas exceeds __________.

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Question 1 of 27070

Inert gas systems fitted on tank vessels must be fitted with an alarm to give an audible and visual warning when the oxygen content of the inert gas exceeds __________.

🔍 Key Concepts

• Inert gas system (IGS) purpose: to keep cargo tank atmospheres non-flammable by controlling oxygen content. • Relevant MARPOL/SOLAS/46 CFR requirements on maximum allowable oxygen percentage in inert gas for tankers carrying oil cargoes. • Difference between alarm setpoint and the absolute maximum oxygen limit allowed in cargo tanks.

💭 Think About

• What oxygen percentage is generally considered the upper safe limit to prevent a flammable atmosphere in cargo oil tanks? • Is the alarm supposed to activate right at the danger limit, or slightly before it to provide a safety margin? • Which of the choices best represents a realistic regulatory threshold for an IGS oxygen alarm on oil tankers?

✅ Before You Answer

• Verify the regulatory oxygen limit for inert gas delivered to cargo tanks under SOLAS/MARPOL or 46 CFR (typically stated as "not more than X% by volume"). • Check whether the alarm setting is required to be at or below that maximum limit, and by how much. • Confirm that the chosen option reflects a conservative safety margin used in tanker practice and regulations.