NFPA 36-2013 Standard for Solvent Extraction Plants (Effective Date 12 17 2012).pdf

1、NFPA36 Standard for Solvent Extraction Plants 2013 Edition NFPA, 1 Batterymarch Park, Quincy, MA 02169-7471 An International Codes and Standards Organization IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPADOCUMENTSNOTICE AND DISCLAIMER OF LIABILITY CONCERNING THE USE OF NFPA DOCUMENTSNFPAcodes, st

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29、13 EditionThis edition of NFPA 36, Standard for Solvent Extraction Plants, was prepared by the Techni-cal Committee on Solvent Extraction Plants. It was issued by the Standards Council on No-vember 27, 2012, with an effective date of December 17, 2012, and supersedes all previouseditions.This editio

30、n of NFPA 36 was approved as an American National Standard on December 17,2012.Origin and Development of NFPA 36This standard was developed at the request of the solvent extraction industry in an effort toachieve greater uniformity in fire protection practices for extraction plants. The purpose ofth

31、e standard is to provide reasonable standards for the design and operation of solvent ex-traction processes and extraction plants.In the development of this standard, the Technical Committee on Solvent ExtractionPlants recognized some fundamental differences between the operation of solvent extracti

32、onplants and the processing of solvents in other facilities. Many extraction plants are relativelysmall units in isolated locations, operated without the benefit of overall fire protection mea-sures, such as are customary in large solvent processing facilities.The operator of a solvent extraction pl

33、ant must establish and maintain fire safety esprit decorps among a small number of employees, as opposed to relying on the established customsof large-scale operations.There are certain hazards in the combining and separating of solids and solvents that arepeculiar to the solvent extraction industry

34、. Also serving as a complicating problem is thepotential dust explosion hazard in some areas of the typical plant. Therefore, the technicalcommittee determined that it would be desirable to give consideration to practices applicableto both dust-laden and flammable vapor-laden atmospheres.NFPA 36 was

35、 tentatively adopted at the 1957 Annual Meeting of the Association. A revisionof this tentative edition was adopted at the 1958 Annual Meeting. NFPA 36 was officiallyadopted by the Association at its 1959 Annual Meeting. Amendments were adopted in 1962,1964, 1967, 1972, 1973, 1974, 1978, 1983, 1985,

36、 1988, 1993, 1997, 2001, 2004, and 2008.The 1997 edition of NFPA 36 incorporated the following amendments:(1) New appendix text to 1.1.1 to refer the user to NFPA 30, Flammable and Combustible LiquidsCode, for solvent extraction processes not covered by NFPA 36(2) New 1.1.6, extending the scope of N

37、FPA 36 to any preparation or meal finishing area thatis connected to the solvent extraction process by a conveyor, thus establishing a boundarybetween those operations governed by NFPA 36 and those that might be governed byNFPA 61, Standard for the Prevention of Fires and Dust Explosions in Agricult

38、ural and FoodProducts Facilities(3) Revision of 5.2.5 to require compliance with all stated measures for preventing vaporsfrom migrating beyond the “controlled” or “restricted” areas(4) New appendix text to 5.5.1 to provide guidance to the user in applying requirements forhazardous (classified) loca

39、tions(5) New 5.8.1.7, which established specific requirements for actions to be taken to removevapors from the extractor, especially during emergencies(6) New 5.8.9.6, which established a requirement for means to automatically sense excesspressure in the extractor or in the desolventizer-toaster and

40、 to automatically reduce theexcess pressure to a safe level(7) Numerous editorial and minor technical improvements361NFPA and National Fire Protection Association are registered trademarks of the National Fire Protection Association, Quincy, Massachusetts 02169.The 2001 edition of NFPA 36 incorporat

41、ed the following amendments:(1) A revised definition of fame arrester(2) A revision to 2.1.4 to require written authorization for repairs involving hot work(3) A revision of 4.1.2 to clarify which provisions do not apply when the liberation of dust is adequately controlled(4) A revision of Section 4

42、.5 to better describe when repairs, including those involving hot work, can be performedwithout shutting down the entire process(5) A revision to 5.8.1.1 to clarify the requirements for venting of process equipment(6) A new 5.8.1.5 that stated that a flame arrester is not required in the discharge l

43、ine from an emergency pressurerelief valve(7) A new 5.8.1.7 that prohibited installing a shutoff valve in the overflow line from a tank or vessel(8) A revision to 5.8.1.9 to clarify the means of exhausting vapors from plant equipmentThe 2004 edition of NFPA 36 was a complete editorial rewrite of the

44、 previous edition to comply with NFPAs Manualof Style for Technical Committee Documents and also incorporated the following technical amendments:(1) Revised definitions of the terms extraction process, flame arrester, flammable liquid (to correlate with NFPA 30, Flam-mable and Combustible Liquids Co

45、de), inert gas, lower flammable limit, and upper flammable limit(2) Addition of a definition for noncombustible material, extracted from NFPA 220, Standard on Types of Building Construction(3) Revised procedures in 4.5.3 for transfer of solvent, to correlate with NFPA 30, Flammable and Combustible L

46、iquidsCode(4) Revision of 5.3.2 to require the design and construction of solvent storage tanks to comply with NFPA 30, Flammableand Combustible Liquids Code(5) Revision of Section 7.4, Drainage and Spill Control, to provide more specific design requirements for the separa-tion sump(6) Addition of F

47、igure 7.5.2 to illustrate typical locations for providing vent openings in the conveying system(7) Revision of Section 7.6, Cooling Towers, allowing flexibility in locating the various types of cooling towers relativeto the extraction process(8) Addition of an exception to 8.2.6 that allowed a shuto

48、ff valve in a normal vent line or an emergency vent line, if theshutoff valve meets specified criteria(9) Addition of physical property data for isohexane to Annex B to recognize its use as an extraction solventThe 2009 edition of NFPA 36 incorporated the following technical amendments:(1) Revised d

49、efinitions of the terms flame arrester, inert gas, and lower flammable limit(2) Addition of exceptions to 6.2.4 and to 7.9.2 to allow the use of electric space heaters that are approved for Class I,Division 1, Group D or Class II, Division 1, Group G locations(3) Revision to Figure 7.2.1 to show correct dimension reference lines for the extent of the hazardous location abovea process vent(4) Revision to 7.4.2.3 to provide more detailed requirements for the separation sump(5) Addition of a new figure, Figure 7.4.2.3, to illustrate a typical separation sump design(6) Addition of a