本规程描述了收集必要信息并应用适用规范和标准以制定记录区域分类的工程工作流程。本规程涉及易燃液体、气体或蒸汽和可燃粉尘区域的分类，但不涉及可燃纤维和飞灰。本规程适用于石油和化工工艺设施以及其他相关行业，这些行业属于区域分类评估所用标准的范围。本规程适用于新设施和现有设施。这种做法应与石油和化学工业规范和标准一起使用，这些规范和标准定义了区域分类的基础。

This Practice describes an engineering work process for gathering the necessary information and applying the applicable codes and standards to develop a documented area classification. This Practice addresses the classification of areas containing flammable liquids, gases, or vapors and combustible dust, but does not address ignitable fibers and flyings. This Practice applies to petroleum and chemical process facilities and other related industries that fall within the scope of the standards being used for the assessment of the area classification. This Practice is applicable for new and existing facilities. This Practice should be used with petroleum and chemical industry codes and standards that define the basis for area classification.