Vapor recovery is a term used for the recovery of fuel and gasoline vapors from storage tanks, which restrict the escape of vapors into atmosphere. The unit is used to restrict, store, withdraw, and refine vapor from gas storage tanks. Vapors in storage tanks are harmful for the environment and economically beneficial. Vapor recovery is in high demand due to its environmentally conducive and efficient nature, and safety of the users. Use of vapor recovery unit would reduce harmful methane emissions coming out from the crude oil storage tanks.