By American Petrolium Engineering
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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
A P I / P E T R O RP 5 0 5 - E N G L I 9 9 7 m 0 7 3 2 2 9 0 ObCiüb22 5 7 9 m CLASSIFICATION OF LOCATIONS FOR ELECTRICAL INSTALLATIONS AT PETROLEUM FACILITIESCLASSIFIED AS CLASS 1, ZONES o, 1, AND 2 the berth can accommodate. When water levei changes may result in gases or vapors from cargo tank vents or ullage openings collecting underneath the berth deck, consideration should be given to classifying this space as Zone 1. 1 Adequately ventilated enclosed areas containing gas-fueled or diesel-fueled enginedturbines need not be classified solely by reason of the enginekurbine fuel as per NFPA 37.
1 follow: a. the gas detectors are of a stationary type, permanently mounted; portable gas detectors will not satisfy this requirement; b. the gas detection equipment is of a type approved or listed by a nationally recognized testing laboratory (NRTL). 13, Part 1, Performance Requirements, Combustible Gas Detectors; c. an adequate number of sensors is installed to ensure the sensing of flammable gas or vapor in the building (or similar area) in all areas where such gas might accumulate; g. user-provided systems bypassing the disconnecting or other “corrective action” devices (but not audible or visual alarm devices) to allow calibration and maintenance are permitted, provided the bypass system is utilized only during calibration or maintenance operations, and only while the area is manned by personnel who are qualified to take corrective action should there be a malfunction in process, storage, transfer, or similar equipment that potentially might release flammable gas or vapor into the area.
4 It may be possible to reduce the classification of an enclosed area adjacent to a classified area if the enclosed area is purged in accordance with " P A 496. Source Recirculation of inside air is permitted if: Area classified due to sourœ outside nonendosed area a. 2a through h, and, b. 2)to the outside if gasor vapor-air mixtures in concentration over 20 percent of their lower flammable limit (LFL)are detected. -- Adequately ventilated nonenclosed area || ||| ||||| || ||| || Note: Sufficient dilution air must be added to the space in question to ensure that the concentration of flammable gas or vapor is maintained below 25 percent of the lower flammable limit (LFL) for all but abnormal conditions.
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