USCG Exam PracticeEngine-room safety and hazardous materials
According to 46 CFR §28.380, where insulation is used in a machinery space, what additional protective measure is required because flammable vapors may be present?
- A. The insulation must be noncombustible in all cases
- ✓ A vapor barrier covering the insulation must be providedCorrect
- C. The insulation must be removed and replaced with steel lagging
- D. Combustible insulation is permitted without restriction for pipe and machinery lagging
Why B is correct
46 CFR §28.380(f) requires a vapor barrier covering any insulation used in spaces where flammable and combustible liquids or vapors are present, including machinery spaces. While §28.380(e)(1) permits combustible insulation for pipe and machinery lagging in machinery spaces, the vapor barrier requirement of (f) still applies.
Cited:46 CFR §28.380