Tankerman · Operations — Gas Freeing
Before personnel enter a cargo tank that has carried petroleum, the tank must be:
- APressurized with inert gas
- BGas-freed and tested for oxygen, hydrocarbons, and toxic gases with an entry permit issued✓ Correct
- CFilled with seawater
- DHeated to evaporate residue
Explanation
An inerted or vapor-laden tank is deadly. It must be ventilated/gas-freed and the atmosphere tested for sufficient oxygen and safe levels of flammable and toxic gas, with an enclosed-space entry permit and standby attendant, before entry.
Authority: Enclosed Space Entry (USCG topic)
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