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11Contents1GeneraIprov1s1ons······..··········..·························(1)2Termsandsymbols...........................······............(2)2.1Terms..........................................................(2)2.2Symbols······················································(12)3Watersupply...................................................<17)3.1Ratedwaterconsumptionandwa.terpressure..··..·....·"·(17)3.2Waterqualityandcontaminationprevention·....·"·..·..·"·(23)3.3Systemselection..·..·..·..·..··....··....··..·....·..··.."·..·(26)3.4Pipematerials.appurtenancesandwatermeters············(27)3.5Pipinglayoutwww.bzfxw.comandlaying..·..··..·....··....·······"·"·"·..·(32)3.6Designnowandhydrauliccalculationofpipe···············(35)3.7Watertowers,Watertanks.Reservoirs.....................(43)3.8Pressurizingequipmcnts,pumpstations·..·....··"..·..·..·(45)3.9Swimmingpoolsandaquaticrecreationpools···············(49)3.10Coolingwatercirculationandcoolingtowers·..·....··....·(53)3.,11Waterscape···················································(57)4Drainage·························································(58)4.ISelectionofdrainagesystems..·.....·..·..·.....·"·..·····..(58)1\.2Plumbingfixturesandtraps"·"·"·"·..."··""·"....."·(58)4.3Pipinglayoutandlaying"·..··....·"··"..·..·"·..·..·..·..·(60)4.4Hydrauliccalculationofdrainagepipe..··"·"..··""·..·"·(65)4.5Pipematerials,appurtenancesandmanholes•••••••••0•••••(70)4.6Ventpipes......................................................(73)4.7Sewagepumpsandpumppits••••••••••••••••0•••••0••••••••••(77)•3• 124.8Smalldomr.sricwastewatertreatment···...........·..·..··..(79)t1,9Rain,vatcr···········································-··········(84)5Hotwateranddrinkingwatersupply.....·.........·.....(92)5.IRatedconsumption.temperatureandqualityofhc>t,varer......................................................(92)5.2Selectionofhotwatersupply!>ystems"·"··..·..···..·..·..·(97)5.3Calculationofheatconsumptionhotwaterconsumptionandpowercapabilityofheatingc4uipment...........·...···(100)5.4Waterheatingandstotage·..·•··..···..·..··.."··....··....·(103)5.5Calculationofpipenet..·........·..·......·....."·..·...·.....(116)5.6Pipematerials,appurtenancesandpipinglayout..·..····..·(118)5.7Drinkingwatersupply..·"·..·"··....·..·..·..·..··"..··..(120)AppendixADegreeofbackflowhazard&theselectionofbackflowpreventionfacilities·..............024)AppendixBMinimumclearancebetweenundergroundpipelines(structure)forresidential.comnlun1ty...........................................(126)AppendixCProbabilityformulacalculatingwatersupplyfixtureunitandpeakflow,acvalues-table················································(127)AppendixDEquivalentlengthforfrictionlossofvalvesandthreadedfittingsresistance...............028)AppendixECalculationtablefordesignflowofwatersupplypipinginL/S...·.......·..............·..·029)AppendixFCalculationforthenumberofsimultaneouslyusedrinkingwatertaps...·....................(143)Explanationofwordinginthiscode.....·.....·...........·..·(145)Listofquotedstandards..........................................(146)Addition:Explanationofprovisions.....·..·..·.....··....·..·(147)•4• 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