At what maximum gas concentration must the...

Question 1 / 205eccef9dbacbc34ba4d45d26

Question 1 of 205eccef9dbacbc34ba4d45d26

At what maximum gas concentration must the fixed gas detection system on a LNG ship activate an audible and visual alarm?

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Question 1 of 20

5eccef9dbacbc34ba4d45d26

At what maximum gas concentration must the fixed gas detection system on a LNG ship activate an audible and visual alarm?

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🔍 Key Concepts

• Lower Flammable Limit (LFL) – what it represents for a flammable gas like LNG vapor • Difference between % by volume and % of LFL in gas detection alarm settings • Purpose of a fixed gas detection system alarm – early warning vs. imminent danger threshold

💭 Think About

• Ask yourself: do international gas ship standards usually set alarms in terms of an absolute gas percentage in air, or as a percentage of the LFL? • Think about safety margins: should the alarm go off when gas is already near the flammable range, or well before it? How does that influence whether the number is higher or lower? • Consider why using % of LFL is safer and more universal than using plain % by volume for different gases with different flammable limits.

✅ Before You Answer

• Verify whether cargo area gas detectors on gas carriers are normally calibrated and specified in % of LFL, not % by volume • Check which of the options mention lower flammable limit (LFL) explicitly and focus on those first • Confirm that the chosen percentage represents an early warning level (not an emergency shutdown level) relative to the LFL

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Question 1 of 20

At what maximum gas concentration must the fixed gas detection system on a LNG ship activate an audible and visual alarm?

30% by volume.

20% by volume.

30% by lower flammable limit

20% of the lower flammable limit.

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Question 1 / 205eccef9dbacbc34ba4d45d26

Question 1 of 205eccef9dbacbc34ba4d45d26

At what maximum gas concentration must the fixed gas detection system on a LNG ship activate an audible and visual alarm?

Back

Question 1 of 20

5eccef9dbacbc34ba4d45d26

At what maximum gas concentration must the fixed gas detection system on a LNG ship activate an audible and visual alarm?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed