By American Petrolium Engineering
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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
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. These assumed failure rates are deliberately high and the failures usually would occur during a time interval shorter than one hour. On a realistic basis, the probability of simultaneous failure is very remote; therefore, this consideration often justifies a Zone 2 (versus Zone 1) classification.
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. API/PETRO R P 505-ENGL 1997 W 0 7 3 2 2 9 0 ObUUbL2 b2T -|| ||| ||||| || ||| CL4SSIFICATION OF LOCATIONSFOR ELECTRICAL INSTALLATIONS AT PETROLEUM FACILITIES CLASSIFIED AS CLASS 1, ZONES o, 1, AND 2 23 || |||| | || | | ||| | || | || |--- Tank within dike Tank with remote impounding Tank nm 3m(1o') F 7 Drainage path to remote impoundingai Storage tank Continued below left - - grade location such as a sump or trench 2 Drainage path to remote impoundingarea from storage tank e Dike impounding r Grade Drainage path SECTION A-A 0 0 0 0 0 Zone0 Zone1 zone2 Notes: 1.
F. the gas detectors should be calibrated at a frequency in accordance with the manufacturer’s recommendations, but at least once every three months. Calibration should be performed by actual exposure of the sensor to a known mixture (nominal 50 percent LFL recommended) of diluent and methane or other gas anticipated, in accordance with the manufacturer’srecommendations; Note: Electrically heated parts and components could remain at or above the ignition temperature for some time after deenergization.