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?

Question

Accepted Answer

Option C: Safe for men - Not Safe for Fire. When oxygen levels are normal and toxic gases are within limits, the space is safe for men. However, if flammable gas concentrations are just below the lower flammable limit, the space is not safe for fire, as any residual vapor could easily reach an explosive state during welding or burning.