US lawOregonRegulationsChapter 632 — Department of Geology and Mineral IndustriesDivision 10 — OIL AND GAS RULES632-010-0138OAR 632-010-0138OAR 632-010-0138. Fire WallsLast amended: 2013Length: 34 wordsOfficial source Every permanent oil or condensate tank, or battery of tanks, must be surrounded by a dike or firewall with a capacity of one and one-half times that of the tank or battery of tanks.PreviousOAR 632-010-0136NextOAR 632-010-0140