When testing the atmosphere of a compartment...

Question 1 / 205eccef9ebacbc34ba4d465b2

Question 1 of 205eccef9ebacbc34ba4d465b2

When testing the atmosphere of a compartment with a combustible gas indicator, the operator must remember that __________.

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5eccef9ebacbc34ba4d465b2

When testing the atmosphere of a compartment with a combustible gas indicator, the operator must remember that __________.

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🔍 Key Concepts

• Combustible gas indicators (CGIs) measure gas concentration as a percentage of the lower explosive limit (LEL), not general air "safety" • How vapors stratify (heavier-than-air vs lighter-than-air) and where they tend to collect in a compartment • Limitations of sampling with a suction tube (where exactly you are measuring)

💭 Think About

• Think about what a combustible gas indicator actually tells you: is it measuring the whole compartment or just the air you draw into it? • Consider whether petroleum vapors are typically heavier or lighter than air and where they would tend to accumulate in a closed space. • Ask yourself: does any gas detector truly "guarantee" a safe atmosphere for a fixed time period, or is it only valid for the specific sample taken?

✅ Before You Answer

• Verify how LEL/UEL (lower and upper explosive limits) are normally displayed on portable meters. • Confirm whether petroleum vapors generally rise or sink relative to air in confined spaces. • Check what part of the space is actually measured when you take a sample with a suction-tube type combustible gas indicator.

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Question 1 of 20

When testing the atmosphere of a compartment with a combustible gas indicator, the operator must remember that __________.

most petroleum vapors are lighter than air and accumulate around deck longitudinals

the indicator guarantees a safe atmosphere for a maximum of two hours

the meter scale indicates only the upper explosive range

the indicator tests only the atmosphere at the end of the suction tube

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Question 1 / 205eccef9ebacbc34ba4d465b2

Question 1 of 205eccef9ebacbc34ba4d465b2

When testing the atmosphere of a compartment with a combustible gas indicator, the operator must remember that __________.

Back

Question 1 of 20

5eccef9ebacbc34ba4d465b2

When testing the atmosphere of a compartment with a combustible gas indicator, the operator must remember that __________.

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