NFPA 497 化学工艺区易燃液体、气体、蒸气分类及电气安装危险性分类_防火测试中心_防火资源网

NFPA 497 化学工艺区易燃液体、气体、蒸气分类及电气安装危险性分类
日期:2012-02-09 16:42
plosives, pyrotechnics, and blasting agents have unique hazards that are not addressed by the recommendations of the document
Recognition of areas as being unclassified where the gas or vapor concentration is insufficient to reach 25% of the lower flammable limit (LFL)
Additions and revisions to Table 4.4.2 on physical properties of selected chemicals in order to provide information on commonly used materials not previously covered and to resolve differences that existed between this table a

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