Api rp 500, rp for classification of locations for electrical installations. For further information on protection against static electricity. Both of these techniques require extensive knowledge of the chemical process. Hazardous area classification for electrical systems petrowiki. Combined with the nec, it has given me an increased level of confidence when selecting classification for an area. Api 500b was originally issued january 1961 as api llj, recommended practice for placement of electrical equipment on production leases. I think one big difference between nfpa 497 and api 500 are how they treat the inside of buildings.
Aug 17, 2017 the api rp500 includes a lot of discussion regarding ventilation and classification choices. American companies refer to api rp 505 zone system, rp 500 division system. Recommended practice for classification of locations for electrical installations at petroleum facilities classified as class i, zone 0, zone 1, and zone 2. The first document published by api on classificationof locations also was designated rp 500, without a suffix, and was issued by the refining. The first edition of rp 500a was publ ished in february 1955 as api 500, recommended practice for classification of areas for electrical installations in petroleum refineries. October 2015 page 2 in the general framework of implementation of eu directives and. The purpose of this recommended practice is to provide guidelines for. An adequately ventilated outdoor location is any space which is open and free from obstruction to the natural passage of air through it, vertically or horizontally.
This document was produced under api standardization procedures that ensure appropriate notification and participation in the developmental process and is designated as an api standard. Nfpa 302015, chapter 4 provides definitions of flammable and combustible liquids. A catalog of api publications and materials is published annually by api, 1220 l street, nw, washington, dc 20005. Api 1169 pipeline construction inspector certification examination april 2020 december 2020 exams. Refer to api rp 500 and the nec for further details regarding hazardousarea classification. Rp 14f rpl4fz rp 14j rp 75 rp 500 rp 505 rp 520 rp 521 rp 2003 publ2030 publ2218 rptl. Note recommendations for determining the degree and extent of classified locations class i, division 1, and division 2 are addressed in api 500, recommended practice for classification of electrical installations at petroleum facilities classified as class i, division 1, and division 2. My question pertains to the following text highlighted below. If 6 times air circulation in an hours is difficult to achieve then api offers two alternatives. Api rp 500 recommended practice for cla ventilation. Api rp 500 recommended practice for classification of locations for electrical installations at petroleum facilities classified as class i, division i and division 2, third edition.
By order of the executive director office of the federal register washington, d. The first edition of rp 500a was published in february 1955 as api. Some of us feel api rp500 is applicable, and is considered a national consensus standard. Improper design of building ventilation systems, especially those buildings with a pipedin source of flammable material. Figure 39flowing well in a nonenclosed adequately ventilated area.
American petroleum institute api recommended practice rp 500, section. Recommended practice for classification of locations for electrical installations at petroleum facilities classified as class i, zone 0. Recommended practice for classification in areas for electrical installations at production facilities. Api rp 500 recommended practice for classification of locations for electrical installations at petroleum facilities classified as class i. Api rp 500 rp 505 rp 520 rp521 rp550 rp551 std 607 std 620 rp752 rp 1102 std 2000 rp 2003 classfication of locations for electrical. The use of commercially available gas vapor dispersion modeling software.
Ventilation indoor locations shall be designated adequately ventilated if the conditions noted in section 6. One example involves the location of the exhaust fan motor when ventilation is. Recommended practice for design and installation of electrical systems for offshore production platforms name of standards organization. Api was formed in 1919 as a standardssetting organization and is the global leader in convening subject matter experts across segments to establish, maintain, and distribute consensus standards for the oil. Api rp500 states that in general, a naturally ventilated location building, room, or space should be substantially open and free from obstruction to the natural.
Api rp 14f, design, installation, and maintenance of electrical systems for fixed and floating offshore petroleum facilities for unclassified and class 1, division 1 and division 2 locations, fifth edition, july 2008. Design and construction of lpg installations see other formats a by authority of the united states of america legally binding document by the authority vested by part 5 of the united states code 552a and part 1 of the code of regulations 51 the attached document has been duly incorporated by reference and shall be considered legally binding upon all. Api rp 505, recommended practice for classification. Api rp 505 recommended practice for classification of. Interpreting the requirements of articles 500516 of the. Api 505 zone 0 where ignitable concentrations of flammable gases, vapors or liquids can exist all of the time or for long periods of time under normal operating conditions. The ventilation by dilution method to reduce the area class from div 1 to div 2 is outlined in api rp 500 and api rp 505.
Api rp 500 rp 505 rp 520 rp521 rp550 rp551 std 607 std 620 rp752 rp 1102 std 2000 rp 2003 classfication of locations for electrical installations at petroleum facilities recommended practice for classification of locations for electrical illstallations at petroleum facilities classified as class i, zone 0, zone j and zone 2. Find the most uptodate version of api rp 505 at engineering360. It has combined the previously separate recommended practices rp 500a, rp 500b, rp 500c. Dilution ventilation shall be sufficient to immediately bring the flammable gas. Engineering professionals rely on api 505 as the basis for area classifications. Adequate ventilation is defined in api as at least 6 changes of air per an hour. As part of that discussion, where the ventilation rate in enclosed areas is less than 3 air changes per hour acph, it is recommended that permanent continuous combustible gas detection be applied. Division 1, and division 2 are addressed in api 500, recommended practice for classification of electrical installations.
Demystify hazardous area classification and compliance. Recommended practice for classification of locations for. One major criterion in classifying for both api rp 500 and 505 is ventilation. Api rp 500 shows typical examples of classifications of equipment in oil. 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 installation of electrical equipment. Api std 547 generalpurpose formwound squirrel cage induction motors185 kw 250 hp through 2240 kw 3000 hp, second edition. But according to the api 500, the area classification for gas can be eased up from class i division i to class i, division ii, if the area is adequately ventilated. In the back of nfpa 497 are sample diagrams for area classification looking at them youll notice that providing ventilation in a building would allow reduction of, for example, the entire building being classified as division 2 with some division 1. Thank you for attending the api 2018 fall soee standards meeting. The use of api rp 500 annex d, which requires first determining the volatility category of the process material.
This paper compares the major concepts in ventilation requirements contained in api rp 500505 and iec 6007910, specific to indoor, lighter than air, natural gas hazardous atmospheres. Api rp 500 recommended practice for classification of. Previously, iec and north american standards have been successfully adopted in the body of api 500505 7910 mod. Project standards and specifications page 5 of 12 rev. Ventilation natural or artificial that is sufficient to prevent the accumulation of significant quantities of vaporair mixtures in concentrations above 25 % of their lower flammable explosive limit, lfl lel. Engineering guide for determining electrical area classification.
Ansiapi rp 5002012, recommended practice for classification of. Analysis, design, installation and testing of basic suiface safety systems on offshore production platforms. The building had exhaust fans so the calculation was only to check for natural ventilation when the fans were off. The greatest value of the new numbering system is that all conforming screens are measured using the same process which will allow cross. In conclusion, each company has its own rules company specifications but they are based on common documents codes which have been amendedsupplemented in a different manner. Although api rp 500 does not totally embrace all the information in nfpa 30, particularly the sampling provision of 53. Api rp 500 recommended practice for classification of locations for electrical installations at petroleum facilities classified as class i, division i and division 2 paperback 2012 by api author. The next api refining meeting is the 2019 spring refining and equipment standards meeting planned for may 06, 2019 to may 09, 2019, at the grand hyatt san antonio, san antonio, texas. Api rp 500 for division classified facilities allows for the. The first edition of api 500b was issued in january 1966 under the title. Recommended practice for occupational safety for oil and. Building ventilation an overview sciencedirect topics. Api recommended practice 500 rp 500, recommended practice for classification of locations for electrical installations at petroleum facilities, provides guidelines for classifying locations at petroleum refineries, production and drilling areas, and pipeline transportation facilities for the selection and installation of electrical equipment.
Day 2 08300915 iecex dubai area classif final leroux p. Api rp500 ventilation requirements gas compressor stations. To be api rp c compliant, a screen must be tested and labeled in accordance with the new recommended practice. Api rp 500recommended practice for classification of. I used the rp 500 method for investigation because. Recommended practice for hazardous area classification of locations for electrical installations at petroleum facilities. Harmonizing ventilation requirements for indoor lighter. Api rp 500recommended practice for classification of locations. Api rp 500, recommended practice for classification of locations for electrical installations at petroleum facilities classified as class i, division 1 and division 2, 3rd edition, 2008. Harmonizing ventilation requirements for indoor lighter than.
Combustible gases and vapors gases and vapors that can form flammable or. The course materials are based entirely on the recommended practice for classification of locations for electrical installations at petroleum facilities as class i, division 1 and division 2 api rp500, third edition, december 2012. Ventilation chapter 6 fire prevention and protection chapter 8 public exhibitions and demonstrations. Api rp c 1 is a new physical testing and labeling procedure for shaker screens.
Hazardous location classification question class i div 2. You must classify drilling fluidhandling areas according to api rp 500, recommended. American companies refer to api rp 505 zone system, rp 500 division. If we are in a class 1 division 2 location with adequate ventilation 6 exchanges per 1 hour and we have combustible gas detection sensors that are rated class 1 division 2, can the electrical equipment sensors, solenoid valves, limit switches, motors, etc. Api recommended practice 500 rp 500, recommended practice for. Api was formed in 1919 as a standardssetting organization and is the global leader in convening subject matter experts across segments to establish, maintain, and distribute consensus standards for the oil and gas industry. The api rp500 includes a lot of discussion regarding ventilation and classification choices. Nec and api 500 ieee electrical code issues engtips. Particular attention is given to the document sections on ventilation and the use of. Api rp 500 classification of locations for electrical installations at petroleum facilities rp 505 recommended practice for classification of locations for electrical installations at petroleum facilities classified as class i, zone 0, zone i and zone 2 rp 520 sizing. Whereas the classification based on the nec and api standards is used in the u.
Hazardous area classification for electrical systems. Analyzer buildings have the most problematic issues. The american petroleum institute api rp 500 series rp 500a, rp 5006, and rp 500c have served for decades as the petroleum industrys recommended practices on the extent of classified areas. Calculate the ventilation requirements for the office computer room in the main example above if the air change rate was specified to be 2 changes per hour. Api rp 500 1 has a method that they recommend for buildings of 1,000 ft 3 or less. Nfpa 497 a and api rp500 show that unpierced walls limit classification. A catalog of api publications and materials is published annually and updated quarterly by api, 1220 l street, n. Api rp500 can equipment where it could be reasonable for an ahj to determine that leaks are frequent enough to meet 500. Jul 19, 2007 a question has come up recently about codes and standards applicability in gas compressor stations for electrical area classification and ventilation requirements.
Api rp 500 recommended practice for classification of locations for electrical installations at petroleum facilities classified as class i, division i and division 2 api on. American petroleum institute api api rp 500 recommended practice for classification of locations for electrical installations at petroleum facilities classified as class i, division 1 and. Oil and gas plants handle flammable materials hazardous area a hazardous area is defined as an area in which the atmosphere contains, flammable of explosive gases. Locations for electrical installations at petroleum facilities classified as. Adequate ventilation is defined in section of nfpa 497 as a ventilation rate that affords either 6 air changes per hour, or 1 cubic feet per minute cfm per square foot of floor area, or other similar criteria that prevent the accumulation of. American petroleum institute, 1220 l street, nw, washington, dc 200054070. Such locations may be roofed over andor closed on one side. Recommended practice for classification of locations for electrical installations at petroleum facilities classified as class i, division 1 and division 2. The use of api rp500 annex d, which requires first determining the volatility category of the process material. Electrical installations at petroleum facilities classified as class i, division 1 and division 2 api recommended practice 500 third edition, december 2012 errata, january 2014. Oct 29, 2019 the ventilation by dilution method to reduce the area class from div 1 to div 2 is outlined in api rp 500 and api rp 505. The same documents issued in the early design stage were kept unchanged for 20 years or even more, and this situation can compromise the plant safety. Nfpa 496 applied to compressor building nfpa xchange. International electrotechnical commission iec standards.
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