MSC.Circ.585-蒸汽排放控制系统标准.doc

STANDARDS FOR VAPOUR EMISSION CONTROL SYSTEMS 1 The Maritime Safety Committee, at its sixtieth session, recognized the necessity of the international standards for vapour emission control systems and approved the standards developed by the BCH Sub-Committee at its twenty-first session for use by Administrations, as contained in the annex. 2 Member Governments are invited to note this development. 1 GENERAL 1.1 These standards have been developed for the design, construction, and operation of vapour collection systems on tankers and vapour emission control systems at terminals. The standards are intended to apply to vapour emission control systems which collect vapours of flammable cargoes from tanker cargo tanks during cargo loading or ballasting operations. Vapour emission control systems which collect vapour of cargoes having characteristics which may pose hazards in addition to or other than flammability should be subject to special consideration by the Administration. These standards are not intended to require the use of vapour emission control systems but rather to recommend safety standards when such systems are utilized. The requirement to collect vapours will stem from a port Administration or terminal regulation. These standards are intended to promote the safety of terminals, tankers, and their personnel, recognizing the unique design features and characteristics of these systems. 1.2 Definitions 1.2.1 Diluted: the condition in which the concentration of a flammable gas in a flammable gas/air mixture is less than 50% of the lower explosive limit of the gas. 低浓度燃气 1.2.2 Enriched: the condition in which the concentration of a flammable gas in a flammable gas/air mixture is not less than 150% of the upper explosive limit of the gas. When flammable gases are mixed to achieve an enriched condition, the upper explosive limit of the flammable gas mixture shall be used. 高浓度燃气 1.2.3 Flammable cargoes means cargoes of crude oil, petroleum products, and chemicals