By American Petrolium Engineering
Read or Download 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 PDF
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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
2 Petroleum handling equipment does not fail frequently. Furthermore, the NEC requirements for electrical installations in Zone 2 locations allow that a source of ignition may occur in the event of an electrical equipment failure. This also does not happen frequently. For example, assume that the electrical and petroleum handling equipment each fail at the rate of once every 8,OOO hours (once per year). The probability that both types of equipment will fail during the same hour is only one in 64 million.
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.
Building ridge vents, taining vents from instruments and control devices utilizing flammable gas for control are classified as shown in Figure 15. building roof vents, and atmospheric tank vents) venting from a Zone O area are classified in a manner similar to that shown in Figure 16, except they should be surrounded by a Zone O classificationfor a distance of 50 cm (18 in). 5 m ( 5 ft). 2 Enclosed areas containing vents from instruments and control devices utilizing flammable gas for control are classified Zone O to the extent of the enclosed area.