Engineering · Safety — Enclosed Spaces
Before entering an enclosed space such as a fuel or ballast tank, the FIRST safety step is to:
- AEnter quickly with a flashlight
- BTest the atmosphere for oxygen, flammable, and toxic gases and ventilate✓ Correct
- CPost a sign only
- DWear a dust mask
Explanation
Enclosed-space entry requires atmosphere testing (oxygen 19.5-23.5%, flammable, toxic), ventilation, a permit, a standby attendant, and rescue arrangements before anyone enters.
Authority: Engine-Room Safety (USCG engineering topic); enclosed-space entry
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