NFPA 22-2013 Standard for Water Tanks for Private Fire Protection (Effective Date 12 17 2012).pdf

1、NFPA22 Standard for Water Tanks for Private Fire Protection 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 DOCUMENT

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28、ecretary, Standards Council, NFPA, 1 Batterymarch Park, P.O. Box 9101, Quincy, MA 02269-9101; email: stds_adminnfpa.orgFor more information about NFPA, visit the NFPA website at www.nfpa.org.12/11Copyright 2013 National Fire Protection Association. All Rights Reserved.NFPA22Standard forWater Tanks f

29、or Private Fire Protection2013 EditionThis edition of NFPA 22, Standard for Water Tanks for Private Fire Protection, was prepared by theTechnical Committee on Water Tanks. It was issued by the Standards Council on November 27,2012, with an effective date of December 17, 2012, and supersedes all prev

30、ious editions.This edition of NFPA 22 was approved as an American National Standard on December 17,2012.Origin and Development of NFPA 22In 1909, the NFPA Committee on Gravity Tanks developed the Standard on Gravity Tanks.Amendments were considered in 1912 and 1913, and the standard was adopted in 1

31、914.Revised or amended editions were adopted in 1915, 1917, 1918, 1919, 1922, 1926, 1928, 1930,1931, 1933, 1936, 1941, 1949, and 1950.The name of the committee was changed to the Committee on Water Tanks, and itsrecommendations resulted in changes adopted in 1957, 1958, 1962, 1965, 1967, 1970, 1971,

32、1974, 1976, 1978, 1981, and 1987.Tanks other than gravity tanks (which, at that time, included concrete reservoirs) and valvepits were first covered in 1913, pressure tanks (formerly covered by Standards for SprinklerSystems) were covered in 1915, and tank heating was covered in 1922. The standard t

33、itle hasbeen periodically amended to reflect the expanded scope of the standard.The 1993 edition provided new, environmentally friendly requirements for tank-coatingsystems. Two new chapters were included to cover the design and erection of bolted steeltanks and concrete tanks. Information on fiberg

34、lass tanks also was included. These changes,along with other editorial changes, reflected the current information for water storage tankdesign.The 1996 edition of NFPA 22 consolidated tank care and maintenance information withina single chapter. Further revisions addressed the corrosion resistance o

35、f certain tank compo-nents, access into tanks, the monitoring of internal conditions, and the structural stresses towhich tanks are subjected. The figures in Appendix B were revised to reflect current practices.Editorial changes were also made.The 1998 edition further addressed environmental issues.

36、 All inspection, testing, andmaintenance requirements were removed and added to the appropriate chapter of the 1998edition of NFPA 25, Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Pro-tection Systems.The 2003 edition was changed to conform to the Manual of Style for NFPA

37、Technical Commit-tee Documents, 2000 edition. Referenced publications were updated.The 2008 edition recognized the use of fiberglass-reinforced plastic (FRP) tanks with anew Chapter 11. Acceptance test requirements were consolidated into a new Chapter 17,“Acceptance Test Requirements,” to improve us

38、er-friendliness.The 2013 edition has added sizing requirements for break tanks in Chapter 4 and sizingprocedures for pressure tanks in the Chapter 7 annex material. The term suction tank hasbeen defined, and the requirements for anti-vortex plates revised. Table 5.4 has been updatedto align with cur

39、rent industry standards.221NFPA and National Fire Protection Association are registered trademarks of the National Fire Protection Association, Quincy, Massachusetts 02169.Technical Committee on Water TanksRobert M. Gagnon, ChairGagnon Engineering, MD SEPhillip A. Brown, SecretaryAmerican Fire Sprin

40、kler Association, Inc., TX IMKevin P. Bellew, Sprinkler Fitters the unit weight of concrete shall beconsidered to be 144 lb/ft3(2307 kg/m3).4.12.2 Live Load.4.12.2.1 Under normal conditions, the live load shall be theweight of all the liquid when it overflows the top of the tank.4.12.2.2 The unit we

41、ight of water shall be considered to be62.4 lb/ft3(1000 kg/m3).4.12.2.3 Proper provisions shall be made for temporarystresses during erection.4.12.2.4 Where roofs have slopes of less than 30 degrees, theyshall be designed to support a uniform weight of 25 lb/ft2(122 kg/m2) on the horizontal projecti

42、on.4.12.3 Wind Load.4.12.3.1 Under normal conditions, the wind load or pressureshall be assumed to be 30 lb/ft2(147 kg/m2) on vertical planesurfaces, 18 lb/ft2(88 kg/m2) on projected areas of cylindri-cal surfaces, and 15 lb/ft2(73 kg/m2) on projected areas ofconical and double-curved plate surfaces

43、.4.12.3.2 Where designing for wind velocities over 100 mph(161 km/hr), all of these specified unit pressures shall be ad-justed in proportion to the square of the velocity, assumingthat the pressures are for 100 mph (161 km/hr).4.12.4 Earthquake Load.4.12.4.1 Tank structures shall comply with the lo

44、cal buildingcode for seismic requirements.4.12.4.2 Specific design criteria shall be contained in the ap-propriate chapter for the particular tank, or in local codes,whichever is more stringent.4.12.4.3 Flat-bottom tanks shall be designed by a method thataccounts for the sloshing of the contents (ef

45、fective massmethod).4.12.5 Balcony, Platform, and Ladder Loads.4.12.5.1 A vertical load of 1000 lb (454 kg) shall be assumedto be applied to any 10 ft2(0.93 m2) of area on the balconyfloor and on each platform, 500 lb (227 kg) applied to any10 ft2(0.93 m2) area on the tank roof, and 350 lb (159 kg)

46、oneach vertical section of ladder.4.12.5.2 All of the structural parts and connections shall bedesigned to withstand such loads.4.12.5.3 These specified loads shall not be required to becombined with snow loading.4.12.6 Columns and Struts.4.12.6.1 All steel columns and struts shall be designed in ac

47、-cordance with AWWA D100.4.12.6.2 The minimum thickness for any columns in contactwith water shall be 0.25 in. (6.4 mm).4.12.6.3 Tubular sections shall not be flattened to form endconnections.4.12.7 Stress Increases.4.12.7.1 Where wind or earthquake loads are considered incalculating stresses, the m

48、aximum permissible increase inworking unit stresses shall be one-third, provided the resultingsection is not less than required for dead and live loads alone.4.12.7.2 Wind and earthquake loads shall not be required tobe considered simultaneously.229GENERAL INFORMATION2013 Edition4.12.8 Roof Construc

49、tion.4.12.8.1 The roof shall be designed to withstand the forcesanticipated during the erection, inspection, testing, and main-tenance of the tank.4.12.8.2 The maximum allowable uniform live load (in poundsper square foot) and the maximum allowable concentrated load(in pounds) shall be identified on the design drawings and tanknameplate.4.13 Welding. All welding shall be completed in accordancewith AWWA D100, NFPA 241, and ASME BoilerandPressureVesselCode, Section IX.4.14 Roofs.4.14.1* All tanks shall have roofs.4.14.1.1 OSHA-compliant (29 CFR 1910) standard railingshall be