If, in a compartment or space, the gas or oxygen content is not within permissible concentration, and dangerous gases are either present, or may be produced by residues, what would be the safety designation listed on a marine chemist's certificate?
• Marine chemist certificates and how they label spaces for entry and hot work • Difference between conditions that are safe for men (entry) vs safe for fire (hot work/welding/cutting) • Effect of insufficient oxygen or presence of dangerous gases on both human occupancy and ignition/hot work safety
• Ask yourself: If oxygen is not in the permissible range and dangerous gases are present or may be produced, is it safe for people to enter that space at all? • Consider whether a space that is unsafe to breathe in could still be safe for performing hot work, or whether flammable/toxic gases change that. • Think about which combination best matches a space where conditions are clearly not okay yet for normal entry or fire-producing work.
• Verify what "Safe for Men" specifically requires in terms of oxygen and gas levels. • Verify what "Safe for Fire" requires regarding flammable vapor concentration and potential gas production from residues. • Check that your chosen option reflects that both actual and potential dangerous gases are a concern, not just current readings.
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