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API RP 500 Document Information:
Title
Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2
American Petroleum Institute
Publication Date:
Nov 1, 1997
Scope:
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 the presence of flammable gas or vapor, mixed with air, under
normal atmospheric conditions.
Normal atmospheric conditions are defined as conditions that vary
above and below reference levels
of 101.3 kPa (14.7 psia) and 20°C (68°F) provided that the
variations have a negligible
effect on the explosion properties of the flammable materials.
The following items are beyond the scope of this document:
a. Piping systems used for odorized natural gas used as fuel for
cooking, heating, air
conditioning, laundry and similar appliances;
b. catastrophes such as well blowouts or process vessel ruptures. Such
extreme conditions require
emergency measures at the time of occurrence;
c. the suitability of locations for the placement of non-electrical
equipment; and
d. classification of locations containing combustible dust, ignitible
fibers, or flyings.
Recommendations for determining the degree and extent of classified
locations for specific examples
of situations commonly encountered in petroleum facilities are given
in Sections 8 through 14.
While it is important for area classifications at refineries,
production and drilling facilities,
and pipeline facilities to agree to some extent, there are differences
in production, drilling,
transportation and refining facilities. Some differences include the
process conditions, types and
quantities of products handled, the physical size of typical
facilities, and varying housing and
sheltering practices.
Section 8 includes applications that are common to several of the
facility types described in
Sections 9 through 14.
Section 9 is applicable to locations in which flammable petroleum
gases and vapors and volatile
flammable liquids are processed, stored, loaded, unloaded, or
otherwise handled in petroleum
refineries.
Section 10 is applicable to locations surrounding oil and gas drilling
and workover rigs and
production facilities on land and on marine fixed (bottom-founded,
non-floating) platforms where
flammable petroleum gas and volatile liquids are produced, processed
(for example, compressed),
stored, transferred (for example, pumped), or otherwise handled prior
to entering the
transportation facilities.
Section 11 is applicable to locations on Mobile Offshore Drilling
Units (MODUS).
Section 12 is applicable to locations surrounding oil and gas drilling
and workover rigs and
production facilities on floating production units (FPUs) such as, but
not limited to, tension leg
platforms (TLPs), floating production systems (FPSs), floating
production systems with off-loading
(FPSOs), single anchor leg mooring buoys (SALMS), caisson structures,
spars, and other floating
structures where flammable petroleum gas and volatile liquids are
produced, processed (for example,
compressed), stored, transferred (for example, pumped) or otherwise
handled prior to entering the
transportation facilities.
Section 13 is reserved for future use.
Section 14 is applicable to onshore and offshore facilities handling
the delivery of flammable or
combustible petroleum liquids or flammable gases. Pipeline facilities
may include pump and
compressor stations, storage facilities, manifold areas, valve sites
and pipeline right-of-way
areas.
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