A compartment is tested and found to contain...

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Question 1 of 205eccef9ebacbc34ba4d465fc

A compartment is tested and found to contain 20.8% oxygen by volume, permissible concentrations of toxic materials, and concentrations of flammable gas just below the lower flammable limit. If the residues are not capable of producing toxic materials or flammable concentrations, what would be the designation listed on the marine chemist's certificate?

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🔍 Key Concepts

• Marine chemist’s certificate designations for space entry and hot work • Required oxygen range for safe entry and for safe hot work • Meaning of "just below the lower flammable limit (LFL)" in terms of fire risk

💭 Think About

• Compare the given oxygen percentage with the typical safe range for personnel entry and for performing hot work. Is 20.8% within that range? • If flammable gas is present "just below" the LFL, what could happen if conditions change slightly (temperature, ventilation, residues disturbed)? • Ask yourself: Does "permissible concentration" of toxic materials mean it is safe for people, for fire, or for both?

✅ Before You Answer

• Verify the normal oxygen content of air and the usual acceptable range for entry (in percent by volume). • Check how being just below the LFL affects the ability to safely perform hot work (welding, cutting, etc.). • Confirm that both conditions must be met for a space to be listed as "Safe for men" and/or "Safe for Fire" on the chemist’s certificate.

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