CSLB C-36 Plumbing ContractorSafetyHard
A plumbing contractor is using a portable propane torch for soldering copper pipes in a confined area with limited ventilation. What is the MOST significant atmospheric hazard that could develop if proper precautions are not taken?
- ADepletion of oxygen.
- BAccumulation of methane gas.
- CIncrease in carbon dioxide from combustion.
- DRelease of hydrogen sulfide.
Show answer & explanationAnswer & explanation
Correct answer: A. Depletion of oxygen.
Combustion processes, such as those from a propane torch, consume oxygen. In a confined area with limited ventilation, this oxygen consumption can rapidly lead to oxygen depletion, posing an immediate and severe risk of asphyxiation to workers.
Why the other options are wrong
- B. Methane gas is typically associated with natural gas leaks, not directly from propane torch combustion.
- C. While carbon dioxide is produced by combustion, oxygen depletion is the more immediate and life-threatening hazard in a confined space with limited ventilation.
- D. Hydrogen sulfide is a toxic gas associated with sewage or decomposition, not directly generated by a propane torch.
Oxygen Depletion (Confined Space)
A hazardous condition in a confined space where the oxygen concentration falls below a safe level (typically 19.5%), often due to combustion, displacement by other gases, or biological processes.
- Can cause rapid asphyxiation.
- Common in confined spaces with combustion sources.
- Requires atmospheric testing and ventilation.
Memory trick: In a box, with a flame, oxygen goes down, that's the dangerous game.