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API RP 500

Recommended Practice for Classification of Areas for Electrical Installations in Petroleum Refineries

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Organization: API
Publication Date: 1 January 1957
Status: inactive
Page Count: 14
scope:

The refinery areas to which this publication applies are those in which flammable petroleum gases and volatile liquids are: a, processed; b, stored; and c, loaded, unloaded, or otherwise handled.

In establishing the limits of classified areas, it is assumed that the vapors are heavier-than-air Group D hazardous materials as defined in Art. 500, NFPA Bulletin No. 70: National Electrical Code (see Appendix).

If there are different conditions than average, or if the flammable vapors are lighter than air (NEC Groups A, B, or C), it may be necessary to make suitable modification of the practices out-lined herein. However, the classification of areas based on heavier-tha-air vapors should normally be conservative for lighter-than-air vapors. Refinery processing facilities consist of specialized equipment within which liquids or vapors are continuously processed at high rates and at elevated temperatures and pressure. Both chemical and physical changes occur in these materials, and during "abnormal" conditions the composition and properties of stocks may change drastically. These conditions, together with considerations of operating continuity, dictate standards of refinery design that are not warranted in other operations of the petroleum industry. For these reasons, it is considered that the recommendations of this publication do not apply outside of refineries.

Factors such as corrosion, weather, maintenance, equipment standardization and inter-changeability, and possible process changes or expansion frequently dictate the use of special enclosures or installations for electrical systems. Such factors are outside the scope of this publication, which is concerned entirely with proper application of electrical equipment to avoid ignition of flammable vapors and gases.

Document History

June 1, 2023
Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1, and Division 2
Purpose The purpose of this recommended practice is to provide guidelines for classifying locations Class I, Division 1 and Class I, Division 2 at petroleum facilities for the selection and...
December 1, 2012
Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2
This document applies to the classification of locations for both temporarily and permanently installed electrical equipment. It is intended to be applied where there may be a risk of ignition due to...
December 1, 2012
Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2
This document applies to the classification of locations for both temporarily and permanently installed electrical equipment. It is intended to be applied where there may be a risk of ignition due to...
December 1, 2012
Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2
This document applies to the classification of locations for both temporarily and permanently installed electrical equipment. It is intended to be applied where there may be a risk of ignition due to...
November 1, 1997
Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2
PURPOSE The purpose of this recommended practice is to provide guidelines for classifying locations Class I, Division 1 and Class I, Division 2 at petroleum facilities for the selection and...
November 1, 1997
Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2
This document applies to the classification of locations for both temporarily and permanently installed electrical equipment. It is intended to be applied where there may be a risk of ignition due to...
November 1, 1997
Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2
1 Scope 1.1 PURPOSE 1.1.1 The purpose of this recommended practice is to provide guidelines for classifying locations Class I, Division 1 and Class I, Division 2 at petroleum facilities for the...
June 1, 1991
Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities
This document applies to the classification of locations for both temporarily and permanently installed electrical equipment, The suitability of locations for the placement of non-electrical...
API RP 500
January 1, 1957
Recommended Practice for Classification of Areas for Electrical Installations in Petroleum Refineries
The refinery areas to which this publication applies are those in which flammable petroleum gases and volatile liquids are: a, processed; b, stored; and c, loaded, unloaded, or otherwise handled. In...
February 1, 1955
RECOMNIENDED PRACTICE FOR CLASSIFICATION OF AREAS FOR ELECTRICAL INSTALLATIONS IN PETROLEUM REFINERIES
A description is not available for this item.

References

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