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. 3.0 Design <br /> . _ 3.1 Special Nequlremenfs <br /> � Qj Due lo the polentlally hazardoue nalure ol CIDi ereas,Ihe lollow�ng NEC <br /> , , and FM requlremenls must be lollowed el all limes. <br /> WARNINO: fln�nd sAoeM h�nrA.Thl� <br /> elaetrlc�l�y�lem mual D�tleflpn�E�nd 1.Use only heat-Iracing syslems epproved lo�CI01 appllcatlons. HOTV and <br /> InttHhd propuly.follow HI wunlnp� HXTV heeling cables and HAK-G-FM componenls klts ere deslgned and <br /> �nd Intlruellon�In IhN quld��nd tll approved es e syslem. Do nol subslllute eny perls. <br /> Ilier�lur�Ineludrd In produel p�cN�pe� <br /> �o pnveni Itr�or�ienried n�:�rd. p,Use GFPDs or EPDs. See Saction 2.61or recommer.ded producls. <br /> 3.Contacl Chemelex lor T•reting verllicatlon. Prlor to supplylnp healing <br /> system orders,we revlew the T•reting requ�rements ol each�ppllcetlon. <br /> Theee requlremenls�re delerminad based on Ihe subslance(e)Ilsled I� <br /> the CID1 classillcatlon end corresponding Ip�ltlon lemperaturo aecording <br /> lo publicalion NFPA-925M. <br /> 4.Complate the CID1 Installellon Reaord and Ille on s�te. Inatdlen are <br /> requlred lo complele and submlt a CID1 Ins�a�latlon Record lo Ihe ueer. <br /> Users musl melnlain thls torm on Ille;see Secllon 4.15 0l ihls gulde. <br /> 3.2 ProductFamllySelectlnn <br /> Selection ol Ihe HOTV or HXN heal•Iracing systems Is based on Ihe lollowing: <br /> • The T•raling or maximum allowa6le surlace lemperalure In Ihe CI01 area. <br /> • The mazimum conlinuous opera�ion lemperalure. • <br /> ' -' � • The maximum inlermlilenl exposure lemperalure up l0 1,000 hwrs <br /> �- cumulalively. <br /> A � <br /> 3.3 Sample Appllcaflan <br /> In Ihis ezemple,heat•Iracing Is needed lor a process weter Ilne in an enclosed <br /> pumping slalion Ihat is classilied CID t because{I conteins toluene end benzene. <br /> The waler Is pumped al 100•F, and Ihe waler line fs occasionally deenad wflh 150 . <br /> psig sleam a1366'F. _ _ _ <br /> ' . The pipe is 6'diemeler sleol wilh 2'calcium silicale insulation. The coldesl <br /> , recorded tempeiature Is-20•F. ' <br /> Sfep 7. Delermine fhe T-rafing requfremenf. <br /> � II the T�raling ol Ihe area has nol been delermined,lol�ow the procedure below. <br /> A.Oeteimine Ihe Ignilion lemperalure,given in cenligrade,ol all Ihe gases In Ihe <br /> area Irom NFPA publicalion NfPA-325M. <br /> Example: • <br /> Toluene:4B0'C <br /> Benzene:49B•C <br /> B.Selecl ihe bwest Ignilion gas as ihe delermining gas. <br /> Toluene:480•C <br /> '�r'� C.Mulliply ihe Igni�ion lemperelure in•C by 0.8,as a salely margin per <br /> IEEE and FM requiiemems. <br /> 480•C �0.8=384•C = 729•F <br /> Design 5 <br />