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Gas blankets over vessels containing hot oil can be either fuel gas or nitrogen blanketed. The blankets should always be vented to flare to reduce discharging hydrocarbons to the atmosphere. Fuel gas cannot be vented to the atmosphere; therefore, nitrogen blanketing is used for large atmospheric pressure storage tanks.

For reference: Refinery "fuel gas" is the gaseous product produced when crude oil is refined. It varies in composition from refinery to refinery and may consist of methane, ethane, propane, butane, or any C1-C4 molecule.

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