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Additional info 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

Example text

This ventilation rate can be accomplished by either natural or mechanical means. might be adequately ventilated, while the upper portion of the shed (particularly if without ridge vents or the like) might be inadequately ventilated. 1 A nonenclosed adequately ventilated area that is adjacent to a classified area, and that is not separated from the classified area by a vaportight barrier, should be classified to the extent designated by Section 8 through 14, as applicable. Reference Figure 2. 2 An enclosed area that is adjacent to a classified area, and that is separated from the classified area by a vaportight barrier, is unclassified, considering only the external source.

5 A nonenclosed adequately ventilated location containing batteries is unclassified. 2 It is recommended that the reader also reference NFPA 850, Recommended Practice for Fire Protection for Fossil Fueled Steam Electric Generating Plants. NFPA 850 provides recommendations (not requirements) for fire prevention and fire protection for gas, oil, or coal-fired electric generating plants used for elecmc generation. NFPA 850 does not address the specific issue of area classification due to liquid or gaseous fuel, but it would be prudent to review the safety recommendations of both " P A 37 and NFPA 850 when designing generating stations.

3 Vents, Relief Valves, and Rupture Disks Note: This section assumes that the process equipment and instrument and _ . ,. 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 locatiƶnfor example, Zone 1 instead of Zone O.

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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 by American Petrolium Engineering


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