This standard gives recommendations in respect of the selection of equipment, installation practice and the maintenance of small to medium-sized chlorine gas installations. It gives recommendations for vacuum type systems with up to six cylinders or a single "ton" container of nominal capacity 1 000 kg. It lays down procedures to be followed to minimize risks to the safety of persons and the environment in terms of exposure to chlorine. General guidelines regarding medical treatment of persons exposed to chlorine are included.