API RP 502, Recommended Practice for Classification of by American Petrolium Engineering

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

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.

5 meters (25 feet) above the cargo tanks at their highest position. 3. Additional locations may have to be classified as required by the presence of other sources of flammable liquids on the berth, or by the requirements of the Coast Guard or other authorities having jurisdiction.

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.

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