Editing Inerting system (section)

==Oil tankers==
Oil tankers fill the empty space above the oil cargo with inert gas to prevent fire or explosion of hydrocarbon vapors. Oil vapors cannot burn in air with less than 11% oxygen content. The inert gas may be supplied by cooling and scrubbing the flue gas produced by the ship's boilers. Where diesel engines are used, the exhaust gas may contain too much oxygen so fuel-burning inert gas generators may be installed. [[One-way valve]]s are installed in process piping to the tanker spaces to prevent volatile hydrocarbon vapors or mist from entering other equipment.<ref>Bruce, George J. Eyres, David J. (2012). ''Ship Construction (7th Edition)''. Elsevier. 978-0-08-097239-8 page 234</ref> Inert gas systems have been required on oil tankers since the [[SOLAS Convention|SOLAS]] regulations of 1974. The [[International Maritime Organization]] (IMO) publishes technical standard IMO-860 describing the requirements for inert gas systems. Other types of cargo such as bulk chemicals may also be carried in inerted tanks, but the inerting gas must be compatible with the chemicals used.