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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

Sample text

2. 1. 5 Gas pressure regulators, shutdown valves, and similar equipment in non-fuel service should be classified according to the appropriateportions of Sections 8 through 14. 6 Gas scrubbers in non-fuel service should be classified the same as hydrocarbon pressure vessels. Gas filter-separators in non-fuel service should be classified the same as launchers or receivers. 1 This section presents guidelines for classifying locations where batteries are installed. Areas classified solely because they contain batteries are classified because of hydrogen evolution from the batteries, and, therefore, require a Group IIC designation.

Adjustable louvers that are closed only during abnormal conditions (such as during a fire or fire suppressant release) and are closed only automatically can be considered the same as open floors, roofs, or wails for ventilation purposes. 1. 1 Adequate ventilation is defined as ventilation (natural or artificial) that is sufficient to prevent the accumulation of significant quantities of vapor-air or gas-air mixtures in concentration above 25 percent of their lower flammable (explosive) limit, LFL (LEL).

2. Distances given are for typical petroleum facilities: they must be used with judgement, with considerationgiven to all factors discussed in the text. 3. Zone 2 area extends 3 meters ( I O feet) horizontal distance from the tank shell (only) if there is no dike and there is no remote Impounding. 4. The interior of the vent piping is Zone O. Cross hatching has been omitted for drawing clarity. 5. 5 meters (18 inches) around vents is classified Zone O. i) -- COPYRIGHT 2002; American Petroleum Institute || ||| ||||| || ||| || |||| | || | | ||| | || | || |--- Document provided by IHS Licensee=Fluor Corporation/2110503105, User=, 08/25/2002 18:26:21 MDT Questions or comments about this message: please call the Document Policy Management Group at 1-800-451-1584.

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