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 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
1 Areas in and around flammable liquid storage tanks in nonenclosed adequately ventilated areas are classified as shown in Figure 6. 2 Areas surrounding fixed roof flammable liquid storage tanks in adequately ventilated enclosed areas are classified as shown in Figure 6, but with the remainder of the enclosed area designated as Zone 2, provided all vents are 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.
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. 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.
5. of IP 15) use the following rule-of-thumb to relate grade of release to the presence of flammable mixtures as shown in Table 2. Although there is no firm rule relating the time that flammable mixtures occur with Zone O, Zone 1, Zone 2, and unclassified locations, many use the rule-of-thumb shown in Table 3. A room designated to spray items with flammable paint is one example of such a location. This room must be designated Zone 1-whether one paints once a day or once a month. That is, it is normal to have an ignitible mixture in the room when it is used for its designated purpose-without equipment failure.