危险区域划分(ABS)

1Ship Fabrication:Electrical and AutomationHazardous Areas and Batteries 1Learning Objective● This module is intended to enhance the awareness of the participant with ABS Rules requirements pertinent to the certification of electrical equipment installed in hazardous areas22Hazardous Areas● Hazardous areas are the spaces within a restricted area in which a flammable atmosphere is continuously present or likely to exist during normal operations or under abnormal/fault conditions3Hazardous Area Classification● Hazardous areas are to be classified based on the likelihood of presence and the concentration and type of flammable atmosphere as well as in terms of extent of the space● Hazardous area classification is a method of analyzing and classifying environment where explosive gas atmospheres may occur to allow the proper selection of electrical apparatus to be installed in that environment● See SVR 4-8-4/27.143Hazardous Area Classification● Hazardous areas are normally classified in zones or in class/division (normally practiced in North America) according to the probability, intensity and duration of assessed potential hazard within the specified area5Fuel source'sFacility Fire and Blast Wall (H-60 / 0.5 barg rated)Potential ignition source’sHazardous Area Classification: Purpose● The purpose of classification of a hazardous area is to verify that ignition sources are not available to ignite potential flammable atmosphere● This is to be achieved by dividing the field into classified hazardous and non-hazardous areas based on probability of presence or possibility of release of flammable gas64Why is Area Classification so Important?7● To provide separation and isolation of the sources of ignition from sources of fla...