NFPA 17-2013 Standard for Dry Chemical Extinguishing Systems (Effective Date 12 17 2012).pdf

1、NFPA 17 Standard for Dry Chemical Extinguishing Systems 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 DOCUMENTSNFP

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29、nguishing Systems2013 EditionThis edition of NFPA 17, Standard forDry Chemical Extinguishing Systems, was prepared by theTechnical Committee on Dry and Wet Chemical Extinguishing Systems. It was issued by theStandards Council on November 27, 2012, with an effective date of December 17, 2012, andsupe

30、rsedes all previous editions.This edition of NFPA 17 was approved as an American National Standard on December 17,2012.Origin and Development of NFPA 17The Dry Chemical Extinguishing Systems Committee was established in 1952. At that time,there was no dry chemical extinguishing system tested and lis

31、ted by a testing laboratory, but bylate 1954, a system was tested and listed by Underwriters Laboratories Inc. At its meeting inJanuary 1955, the Committee prepared an outline of a standard on dry chemical extinguish-ing systems and, in the following year, prepared the standard that was tentatively

32、adopted bythe National Fire Protection Association on June 7, 1956. Changes to the tentative standardled to approval of the first official NFPA standard on dry chemical extinguishing systems in1957. Further amendments were made in 1958, 1968, 1969, 1972, 1973, 1975, and 1980. The1985 edition was a c

33、omplete revision of the standard. The 1990 edition was a partial revision.The 1998 edition of this standard was revised to clarify the requirements for protection ofunclosable openings and equipment shutdown.Changes to the 2002 edition consisted of an editorial restructuring of the standard inaccord

34、ance with the Manual of Style forNFPATechnical Committee Documents, a specific referencefor the listing of pre-engineered systems, and a simplification of the requirements for com-mon ducts.The 2009 edition included requirements for service technician qualifications. Definitionswere coordinated with

35、 the NFPA Glossary of Terms.The 2013 edition of this standard clarifies the requirements for inspection and mainte-nance and provides new requirements for installation acceptance.171NFPA and National Fire Protection Association are registered trademarks of the National Fire Protection Association, Q

36、uincy, Massachusetts 02169.Technical Committee on Dry and Wet Chemical Extinguishing SystemsDavid A. de Vries, ChairFiretech Engineering Inc., IL SELarry Angle, M. Jacks Fire steel pipe conforming toASTM A 53M, Standard Specifications for Pipe, Steel, Black andHot-Dipped, Zinc-Coated,Welded and Seam

37、less; aluminum pipe; ornonmetallic pipe shall not be used.4.5.3* Flexible piping (hose) shall be used only if specified inthe manufacturers design, installation, and maintenancemanual.4.5.4* Other types of pipe and fittings that have been investi-gated and listed for this service shall be permitted

38、to be used.4.6 Dry Chemical.4.6.1* The type of dry chemical used in the system shall not bechanged unless listed for that system.4.6.2 Systems shall be designed on the basis of the flow andextinguishing characteristics of a specific make and type of drychemical.4.6.3* Types of dry chemical shall not

39、 be mixed.4.7 Expellant Gas.4.7.1 Carbon dioxide used in expellant gas cartridges shallmeet the following specifications:(1) The vapor phase shall not be less than 99.5 percent car-bon dioxide.(2) The water content of the liquid phase shall not be morethan 0.01 percent by weight 30F (34.4C) dew poin

40、t.(3) The oil content shall not be more than 10 ppm by weight.4.7.2 Nitrogen used as an expellant gas shall be standardindustrial grade with a dew point of 60F (52.2C) or lower.4.8 Electrical Wiring and Equipment. Electrical wiring andequipment shall be installed in accordance with NFPA 70, Na-tiona

41、l Electrical Code.4.9 Storage Containers.4.9.1 The dry chemical containers used in dry chemical sys-tems shall be designed to meet the requirements of the U.S.Department of Transportation (DOT) or Transport Canada(TC) if used as shipping containers under pressure.4.9.2* If not shipping containers un

42、der pressure, the dry chemi-cal containers shall be designed, fabricated, inspected, certified,and stamped in accordance with the ASME Boiler and Pressure Ves-sel Code, “Rules for Construction of Pressure Vehicles.”4.9.3 The design pressure shall be suitable for the maximumpressure developed at 130F

43、 (55C) or at the maximum con-trolled temperature limit.4.10 Indicators. Dry chemical systems shall be provided withan indicator to show that the system is in a ready condition oris in need of recharging.4.11 Assembly.4.11.1* During assembly, the piping system shall be examinedinternally to detect an

44、d remove contaminants or other foreignmaterials.4.11.2 All extinguishing agent storage containers shall be ex-amined to ensure that they are fastened securely to theirmounting brackets.177COMPONENTS2013 EditionChapter 5 System Requirements5.1 Use and Limitations.5.1.1* Use. The types of hazards and

45、equipment that shall beprotected using dry chemical extinguishing systems shall in-clude the following:(1) Flammable or combustible liquidsCAUTION: Extinguishment of flammable liquid fires, es-pecially Class I liquids (see NFPA 30, Flammable and Combus-tible Liquids Code), can result in a reflash un

46、less all sourcesof ignition have been removed.(2) Flammable or combustible gasesCAUTION: Flammable gases present a potential explo-sion hazard if the flow of gas is not stopped before orduring extinguishment.(3) Combustible solids, including plastics, that melt when in-volved in fire(4) Electrical h

47、azards such as oil-filled transformers or circuitbreakers(5) Textile operations subject to flash surface fires(6) Ordinary combustibles such as wood, paper, and cloth(7) Restaurant and commercial hoods, ducts, and associatedcooking appliance hazards such as deep-fat fryers5.1.2 Limitations. Dry chem

48、ical extinguishing systems shallnot be considered satisfactory protection for the following:(1) Chemicals containing their own oxygen supply, such ascellulose nitrate(2) Combustible metals such as sodium, potassium, magne-sium, titanium, and zirconium(3) Deep-seated or burrowing fires in ordinary co

49、mbus-tibles where the dry chemical cannot reach the point ofcombustion5.1.2.1* Multipurpose dry chemical shall not be used on ma-chinery such as carding equipment in textile operations anddelicate electrical equipment.5.1.2.2 Before dry chemical extinguishing equipment is consid-ered for use in protecting electronic equipment or delicate elec-trical relays, the effect of residual deposits of dry chemical on theperformance on electronic equipment shall be evaluated.5.1.2.3 Dry chemical extinguishing system equipment shallbe used within its listed temperature limita