A fire watch must be maintained for how long after completion of hot work operations?
Correct Answer
B) 30 minutes
OSHA requires a fire watch to be maintained for at least 30 minutes after completion of welding or cutting operations to ensure no smoldering materials ignite. This is a critical fire prevention measure.
Why This Is the Correct Answer
OSHA Standard 29 CFR 1926.352(e) specifically requires that fire watchers remain on duty for at least 30 minutes after completion of welding, cutting, or other hot work operations. This 30-minute period is critical because materials can continue to smolder undetected after hot work is completed, potentially igniting into flames well after the work appears finished. The fire watch ensures immediate response capability during this vulnerable period when hidden fires are most likely to develop.
Why the Other Options Are Wrong
Option A: 15 minutes
15 minutes is insufficient time according to OSHA standards, as materials can smolder for longer periods before igniting into visible flames.
Option C: 45 minutes
45 minutes exceeds the minimum OSHA requirement, though additional time may be warranted in specific high-risk situations.
Option D: 60 minutes
60 minutes is twice the required minimum time and exceeds standard OSHA requirements for routine hot work operations.
Memory Technique
Think 'Thirty minutes Till Safe' - the alliteration helps remember that hot work requires 30 minutes of fire watch after completion.
Reference Hint
OSHA Construction Standards 29 CFR 1926.352 - Welding and Cutting, subsection (e) Fire Prevention
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