How should workers respond to an activated methane detector alarm?

• A. Ignore and continue working while monitoring
• B. Immediately evacuate the area to a safe location; report to supervisor; do not re-enter until declared safe.
• C. Increase ventilation and stay in the area
• D. Call a co-worker to confirm

Answer: (B)

When a methane detector alarms, it means methane gas is present at a level that could ignite or harm people. Methane forms an explosive mixture with air in a wide range, so the safest action is to get everyone away from the gas source and to a designated safe location. After evacuating, you report the situation to a supervisor so the area can be assessed, ventilation can be adjusted as needed, and tests can confirm it’s safe to re-enter. Do not re-enter until a qualified person declares the area safe. Ignoring the alarm or trying to “monitor” while continuing work keeps you at risk of an explosion or asphyxiation. Calling a coworker doesn’t substitute for a proper assessment and controls.