API RP 502, Recommended Practice for Classification of by American Petrolium Engineering

By American Petrolium Engineering

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Additional 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

Example text

Discharge rate, do not require area classification solely due to the presence of the batteries. Note: For the purpose of a m classification, battery vents include relief devices, such as valves that open to the atmosphere, as found in valve-regulated lead acid (VRLA) batteries. 4 Enclosed areas containing rechargeable batteries that (1) have no vents, and (2) either (a) have a total volume less than one-hundredth of the free volume of the enclosed area, or (b) have a charging system that has a rated output of 200 watts or less and that is designed to prevent inadvertent overcharging, do not require area classification solely due to the presence of the batteries.

The examples have been developed by experience in industry and are applicable to most petroleum facilities. Sections 9 through 14 provide guidance for classifying locations within specific refining, production, and transportation facilities. 2 Specific examples listed consider only the item discussed and do not take into account the possible influence of adjacent areas classified due to other equipment. Application of these examples to similar, though not identical, situations should be made with sound engineeringjudgment, employing information presented in this recommended practice and other publications.

For lighter-than-air gases the opposite is true; there is little potential of an ignitible mixture below grade, and greater potential above grade. 1 In the absence of walls or other barriers, and in the absence of air currents or similar disturbing forces, it must be assumed that a gas or vapor will disperse uniformly in all directions, as governed by the gas or vapor density and velocity (that is, heavier-than-air vapors principally downward and outward; lighter-than-air gases principally upward and outward).

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