Tank blanketing, or padding, is the process and practice of covering the surface of a stored commodity, usually a liquid, with a gas. If that commodity is volatile or toxic, tank blanketing can prevent it from harming workers, equipment, and the environment. When the commodity is a food or other substance, tank blanketing protects it from oxidation or contamination through exposure to air or moisture. In most cases, tank blanketing gas is pure, dry nitrogen.

Tank blanketing can prevent liquids from vaporizing into the atmosphere and can maintain the tank's vapor space above a flammable or combustible liquid to reduce potential ignition while pumping. Tank Blanketing can make up the volume of liquid displaced in or out of a tank, or it can make up volume caused by thermal changes of the tank's contents, preventing the creation of a vacuum or excess operating pressure.

Vapor recovery systems are mainly used to prevent vapors from escaping into the atmosphere. When adding liquid to the tank or when the outside temperature rises, causing the vapor inside the tank to expand, the vapor recovery system senses the increase in tank pressure and vents the excessive tank pressure to a safe place.

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