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API RP 500B

87th Edition, October 1, 1987

Complete Document

RECOMMENDED PRACTICE FOR CLASSIFICATION OF LOCATIONS FOR ELECTRICAL INSTALLATIONS AT DRILLING RIGS AND PRODUCTION FACILITIES ON LAND AND ON MARINE FIXED AND MOBILE PLATFORMS THIRD EDITION; ERRATA - MAY 1988

Includes all amendments and changes through Errata , May 1, 1988


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Superseded By: API RP 500

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W/D S/S BY API RP 500
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Product Details:

  • Revision: 87th Edition, October 1, 1987
  • Published Date: May 1, 1988
  • Status: Superseded By:
  • Superseded By: API RP 500
  • Document Language: English
  • Published By: American Petroleum Institute (API)
  • Page Count: 41
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

This document applies to the classification of locations for both temporary and permanently installed electrical equipment. The suitability of locations for the placement of non-electrical equipment is not within the scope of this document. Piping systems used for odorized natural gas used as fuel for cooking, heating, air conditioning, laundry and similar appliances are also beyond the scope of this document. A possible catastrophe such as a well blowout is not covered; such an extreme condition requires emergency measures at the time of occurrence.

Purpose. The purpose of this recommended practice is to provide guidelines for classifying locations surrounding oil and gas drilling and workover rigs and facilities on land and on marine fixed and mobile platforms where flammable petroleum gas and volatile liquids are produced, processed, stored, transferred, or otherwise handled prior to entering the transportation facilities, for the selection and installation of electrical equipment. Basic definitions given in the National Electrical Code have been followed in developing this recommended practice. This publication is only a guide and requires the application of sound engineering judgment.

Electrical installations in areas where flammable liquids or gases are produced, processed, stored or otherwise handled can be suitably designed if the locations of potential sources of release and accumulation are clearly defined. Once a location has been classified, requirements for electrical equipment and associated wiring should be determined from applicable publications. Applicable publications may include the National Electrical Code (NEC) or API RP 14F. Reference Sections 1.3 and 1.4 for other possible applicable publications.