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Extra resources for API RP 502, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Zone O, Zone 1, and Zone 2
Ftcerpt: The lik&hood ofthe presence of an explosivegasat,,,suhete. and hence the t m of zone, depends mainly on the grade of release and the ventilation. N O L A continuous grade of &lease noAdly leads to a Class I, Zone O, a primary grade to Class I, Zone 1 and a secondary grade to class I. 1 If the grade of release is NOT continuous, good engineering judgment nomially would dictate a lesser hazardous locatiönfor example, Zone 1 instead of Zone O. 01 and Appendix D of this document for further guidance.
The open flame of an unprotected fired vessel or flare tip) exist has been utilized in previous issues of RP 500. It is recommended that the application of this practice be limited to unprotected fired vessels or flare tips and that the resulting unclassified locations be resmcted to their immediate vicinity. Electrical equipment located in these unclassified locations typically is de-energized for the majority of the time that the flame source is not present. ized that floors, roofs, and walls will contain structural members, columns, and the like that are not equivalent to open grating and louvers; when such obstructions constitute less than 15 percent of the total area, they may be disregarded for ventilation degree determination.
Note: Gases, vapors, and combinationsof gases and vapors must be carefully analyzed to determine whether they are heavier- or lighter-than-air under ail operating conditions. Mixtures often contain both lighter-than-air and heavier-than-aircomponents. , buildings) used for petroleum operations have mechanical ventilation provided. Also, construction design may permit a substantial degree of natural ventilation that, when coupled with such factors as volumetric content of the enclosed location, floor area, lineal dimensions of walls, and ceiling height could justify considering that enclosed location as adequately ventilated.