13-1999_FAQs

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 NFPA 13-1999 – FAQs NFPA 13  – 1999 FAQs Responses  to FAQs are prepared by NFPA technical staff  to assist users in reading and understanding  NFPA codes and standards.  The responses,  however,  are not Formal  Interpretations  issued pursuant  to NFPA Regulations.  Any opinions expressed are the personal  opinions of  the author(s),  and do not necessarily  represent  the official  position of  the NFPA or its Technical  Committees.  In addition,  the responses  are neither  intended,  nor should be relied upon, to provide professional  consultation  or services.  1. Do I need sprinklers  in my building? NFPA 13 is the NFPA document  that specifies the minimum requirements  for designing and installing sprinkler systems.  It does not specify which buildings  require a sprinkler system.  The requirement  to install a sprinkler system complying  with NFPA 13 can usually be found in one of  the following sources: building code; federal,  state or local regulations;  insurer's requirements;  accreditation requirements;  or owner's request.  2. If  I have a dry‐pipe sprinkler system under a pitched roof  exceeding a slope of  16.7%, do I apply both area increases from Section 7‐2.3.2.5 and Section 7‐2.3.2.6? Yes, both sections would be applied cumulatively to the design area chosen from Figure 7‐ 2.3.1.2 in accordance with Section 7‐2.3.2.8. This is shown in the following example:  The application area determined from Figure 7‐2.3.1.2 is 1500 square feet.  As required by Section 7‐2.3.2.5,  1500 square feet is increased by 30% to 1950 square feet for the steeply pitched roof. As required by Section 7‐2.3.2.6,  the 1950 square feet is increased by 30% for the dry pipe system. Therefore,  the original  density chosen from Figure 7‐2.3.1.2 must be applied over 2535 square feet. Ensure that there are no other design area modifications  required for the system being installed.  3. Can plastic pipe be used on a sprinkler  system complying with NFPA 13? Section 3‐3.5 allows the use of  plastic pipe that has been specifically listed for fire protection use. This pipe must be installed in accordance with its listing limitations,  including installation instructions.  4. What is the limit for the calculated water velocity in a sprinkler system complying with NFPA 13? NFPA 13 does not specify a maximum limit for the calculated water velocity.  5. Do walk‐in type freezers,  coolers,  vaults and safes require sprinklers?  Yes. As explained by Formal Interpretation 78‐6, these areas require sprinklers  because they are part of  the premises.  NFPA 13 requires that sprinklers be installed throughout  the premises in accordance with Section 5‐1.1. There are no exceptions provided which allow for 

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Transcript of 13-1999_FAQs

  • NFPA 13-1999 FAQs

    NFPA131999FAQs

    ResponsestoFAQsarepreparedbyNFPAtechnicalstafftoassistusersinreadingandunderstandingNFPAcodesandstandards.Theresponses,however,arenotFormalInterpretationsissuedpursuanttoNFPARegulations.Anyopinionsexpressedarethepersonalopinionsoftheauthor(s),anddonotnecessarilyrepresenttheofficialpositionoftheNFPAoritsTechnicalCommittees.Inaddition,theresponsesareneitherintended,norshouldbereliedupon,toprovideprofessionalconsultationorservices.

    1. DoIneedsprinklersinmybuilding?NFPA13istheNFPAdocumentthatspecifiestheminimumrequirementsfordesigningandinstallingsprinklersystems.Itdoesnotspecifywhichbuildingsrequireasprinklersystem.TherequirementtoinstallasprinklersystemcomplyingwithNFPA13canusuallybefoundinoneofthefollowingsources:buildingcode;federal,stateorlocalregulations;insurer'srequirements;accreditationrequirements;orowner'srequest.

    2. IfIhaveadrypipesprinklersystemunderapitchedroofexceedingaslopeof16.7%,doIapplybothareaincreasesfromSection72.3.2.5andSection72.3.2.6?Yes,bothsectionswouldbeappliedcumulativelytothedesignareachosenfromFigure72.3.1.2inaccordancewithSection72.3.2.8.Thisisshowninthefollowingexample:TheapplicationareadeterminedfromFigure72.3.1.2is1500squarefeet.AsrequiredbySection72.3.2.5,1500squarefeetisincreasedby30%to1950squarefeetforthesteeplypitchedroof.AsrequiredbySection72.3.2.6,the1950squarefeetisincreasedby30%forthedrypipesystem.Therefore,theoriginaldensitychosenfromFigure72.3.1.2mustbeappliedover2535squarefeet.Ensurethattherearenootherdesignareamodificationsrequiredforthesystembeinginstalled.

    3. CanplasticpipebeusedonasprinklersystemcomplyingwithNFPA13?Section33.5allowstheuseofplasticpipethathasbeenspecificallylistedforfireprotectionuse.Thispipemustbeinstalledinaccordancewithitslistinglimitations,includinginstallationinstructions.

    4. WhatisthelimitforthecalculatedwatervelocityinasprinklersystemcomplyingwithNFPA13?NFPA13doesnotspecifyamaximumlimitforthecalculatedwatervelocity.

    5. Dowalkintypefreezers,coolers,vaultsandsafesrequiresprinklers?Yes.AsexplainedbyFormalInterpretation786,theseareasrequiresprinklersbecausetheyarepartofthepremises.NFPA13requiresthatsprinklersbeinstalledthroughoutthepremisesinaccordancewithSection51.1.Therearenoexceptionsprovidedwhichallowfor

  • NFPA 13-1999 FAQs

    sprinkleromissionintheseareas.

    6. InapplyingtheThreeTimesRule'forsprinklerobstructions(i.e.Section56.5.2.2),whatdimensionisthe24inchmaximumreferringto?Thismaximumdimensionisthedimensionmeasuredfromthesprinklertothenearestedgeoftheobstruction.Isolatedobstructionsthataremorethan24inchesawayfromstandarduprightandpendentsprinklersdonotgenerallycreateasignificantobstruction.

    7. Aresprinklersrequiredinclosets?Yes.TherearelimitedexceptionsspecifiedinSection513.9.2forcertainsmallclosetsinthedwellingunitsofhotelsandmotels.

    8. Canasupplycontrolvalvebeinstalleddownstreamofthefiredepartmentconnection?TheconfusionthatbringsaboutthisquestionisusuallycausedbySection515.2.4.2,theExceptiontoSection514.1.1.2,andExceptionNo.1toSection514.1.1.8.Thesesectionsarenecessarytodifferentiatethefiredepartmentconnectionfromothertypesofwatersupplies.Normally,acontrolvalveisrequiredbeforeandaftereachcheckvalveinasourceofsupply.Thevalvesarerequiredsothatthecheckvalvecanbeisolatedandserviced.Aswell,acontrolvalveisnormallyrequiredineachautomaticsourceofsupplyinaccordancewithSection514.1.1.2.However,thesecontrolvalvesarenotnecessary,norallowed,inthefiredepartmentconnectionpiping.Whilethecontrolvalvesarenotallowedinthefiredepartmentconnectionpipingitself,controlvalvescanbeinstalleddownstreamfromthefiredepartmentconnectionpipinginaccordancewith514.1.1.Itwouldbeimpracticaltorequireafiredepartmentconnectionafterallcontrolvalvesinamultizoneormultisystemarrangement.Furthermore,Section514.1.1.3ofNFPA13requiresthatallvalvescontrollingwatersuppliesbesupervisedintheopenposition.Inallcases,thearrangementforthefiredepartmentconnectionmustcomplywithSection515.2.3.

    9. Ifawatercurtainisinstalled,whatistheequivalentfireseparationrating?NFPA13doesnotspecifyanequivalentfireseparationratingforwatercurtainsinstalledinaccordancewithSection513.4anddesignedinaccordancewithSection79.7.

    10. Whatistheallowablereductioninfireseparationratingsinabuildingwhereasprinklersystemisinstalled?NFPA13doesnotaddresssuchreductions.Somebuilding/firecodeswillspecifyanallowablereductioninfireseparationratingsforcertainbuildingswheresprinklersareprovidedinaccordancewithNFPA13.Youwouldneedtoconsultwiththeapplicablebuilding/firecodeforyourparticularprojecttodetermineifthereareanyallowablereductions.

  • NFPA 13-1999 FAQs

    11. Aresprinklersrequiredintheupperportionofanarchitecturalceilingfeature,evenwhentherearenoopeningstoaboveandthesprinklersatthelowerportiondonotexceedareaofcoveragelimitations?Thisquestionusuallyariseswitharchitecturalfeaturessuchasskylightsandroomswithmultilevelceilings.Thegeneralconcernwiththesetypesoffeaturesisthepotentialforheattopocket'andthenegativeimpacttotheoperationofthesprinklers.Thiscouldbetrueevenifsprinklersarespacedwithintheirlimitationsforallowableareaofprotection.NFPA13doesnotspecificallyaddressthesprinklerrequirementsforthesearchitecturalfeatures.However,theapplicablesectionsofChapter5doaddressthedistancebelowtheceilingthatsprinklersmustbepositioned.Theneedforsprinklersintheupperportioncanbedeterminedbasedonthedistancefromtheupperleveltothepositionatwhichthesprinklerswouldbeinstalledonthelowerlevel.IfthisdistanceexceedstheallowabledistancesspecifiedinChapter5,thensprinklerswouldberequiredattheupperlevel.ObstructionsspecifiedbyChapter5toanyofthesprinklerswouldalsoneedtobeexaminedandaccountedfor.

    12. Aresprinklersrequiredwithinfurniture?No.Sprinklersarerequiredwithinallpermanentspacesofthestructure,suchasclosets,inaccordancewithSection51.1.Moveablefurnitureitems,suchasdesks,dressersandwardrobes,donotrequiresprinklerswithinthemevenwhentheyareaffixedtothepermanentstructureofthebuilding.

    13. MustIdesignthesprinklersystemtoprotectthesamehazardthroughoutthestructure?No.NFPA13doesnotrequirethattheentirestructurebeprotectedasasinglehazardclassification.Therearethreeimportantthingstokeepinmind,however,whendesigningasystemwithmultiplehazardclassifications.Thefirstisthatyouwilllockthebuildinguseintothehazardconfigurationthatthesprinklersystemisdesignedfor.Iftheentirespacewasprotectedforthehighesthazard,however,thebuildinguserwouldnothavetoworryaboutthegenerallocationsofthedifferenthazards.Additionally,thehydrauliccalculationprocedureandsystemlayoutbecomemorecomplexwithmultiplehazardclassificationsthanwherethehighesthazardisusedthroughout.Lastly,Section71.2specifiesrequirementsforbuildingswithtwoormoreadjacenthazardoccupancies.

    14. IftherearenohoseconnectionsinsideabuildingsprinkleredtocomplywithNFPA13,willthewaterdemandneedtoincludeahosestreamallowance?Yes.AnoutsidehosestreamdemandwouldberequiredinaccordancewithSection72.3.1.1.

    15. DoesNFPA13addressfiresprinklersystemsprotectingstorageabove12feet?Yes.The1999editionofNFPA13incorporatedthefiresprinklersystemdesignandinstallationrequirementsfromNFPA231(StandardforGeneralStorage),NFPA231C(StandardforRackStorageofMaterials),NFPA231D(StandardforStorageofRubberTires),

  • NFPA 13-1999 FAQs

    NFPA231E(RecommendedPracticefortheStorageofBaledCotton)andNFPA231F(StandardfortheStorageofRollPaper).TheotherrequirementsofNFPA231,NFPA231C,NFPA231D,NFPA231EandNFPA231FwereincorporatedintoanewstandardNFPA230(StandardfortheFireProtectionofStorage).

    16. HowaretheNFPA13designandinstallationrequirementsarrangedforsystemsprotectingstorageandspecialdesignapproaches?Atableofcontentsisasfollows:73Palletized,SolidPiled,BinBox&ShelfStorage73.1General

    73.2ClassIIV73.3Plastics74RackStorage74.1General74.2ClassIIV(upto25storage)74.3ClassIIV(over25storage)74.4Plastics75IdlePalletStorage76RubberTireStorage77BaledCottonStorage78RollPaperStorage79SpecialDesignApproaches79.1General79.2ResidentialSprinklers79.3QuickResponseEarlySuppressionSprinklersQRES(reserved)79.4LargeDropSprinklers(ClassIIV&Plastics)

  • NFPA 13-1999 FAQs

    79.5EarlySuppressionFastResponseSprinklersESFR(ClassIIV&Plastics)79.6ExposureProtection79.7WaterCurtains79.8ProtectionofSteelColumns

    17. IsthereaceilingheightatwhichNFPA13permitstheomissionofsprinklers?No.


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