Each inert gas system must be designed to...

Question 1 / 270705eccef9dbacbc34ba4d45cfa

Question 1 of 270705eccef9dbacbc34ba4d45cfa

Each inert gas system must be designed to supply the cargo tanks with a gas, or mixture of gasses, that has an oxygen content by volume of __________.

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Question 1 of 27070

Each inert gas system must be designed to supply the cargo tanks with a gas, or mixture of gasses, that has an oxygen content by volume of __________.

🔍 Key Concepts

• Inert gas systems on tank vessels and their purpose (preventing explosions in cargo tanks) • The relationship between oxygen percentage and the flammable range of hydrocarbon vapors • Regulatory limits for maximum oxygen content in inert gas supplied to cargo tanks (46 CFR and SOLAS)

💭 Think About

• Think about what oxygen level is generally considered low enough that hydrocarbon vapors in a tank cannot burn, even if there is an ignition source. • Compare each choice with what you know about normal air composition and the approximate oxygen level at which combustion becomes impossible. • Ask yourself: would a higher oxygen percentage still safely keep the tank atmosphere outside the flammable range under all normal conditions?

✅ Before You Answer

• Recall that normal air has about 21% oxygen by volume; use this as a reference point when judging what is truly 'inert.' • Verify in 46 CFR or SOLAS II-2 what maximum oxygen content is allowed in inert gas supplied to cargo tanks. • Check which option represents a level that is safely below the minimum oxygen concentration needed for combustion, with a good safety margin.

Question 1 of 27070

Each inert gas system must be designed to supply the cargo tanks with a gas, or mixture of gasses, that has an oxygen content by volume of __________.

10% or less

15% or less

20% or less

5% or less

Question 1 / 270705eccef9dbacbc34ba4d45cfa

Question 1 of 270705eccef9dbacbc34ba4d45cfa

Each inert gas system must be designed to supply the cargo tanks with a gas, or mixture of gasses, that has an oxygen content by volume of __________.

Back

Question 1 of 27070

Each inert gas system must be designed to supply the cargo tanks with a gas, or mixture of gasses, that has an oxygen content by volume of __________.