6.3.1 热水供应系统 的管材和管件选用 Selection of Pipes and Fittings of the Hot Water Supply System-1733558725611

6.3.1热水供应系统的管材和管件选用SelectionofPipesandFittingsoftheHotWaterSupplySystem一、热水供应系统的管材和管件PipesandFittingsoftheHotWaterSupplySystem1热水系统采用的管材和管件，应符合国家现行标准的有关规定。管道的工作压力和工作温度不得大于国家现行标准规定的许用工作压力和工作温度。PipesandfittingsofthehotwatersupplysystemshouldcomplywiththerelevantprovisionsofprevailingChinesenationalstandards.Theworkingpressureandtemperatureofthepipesshallnotbegreaterthanthepermissiblevaluesspecifiedinprevailingnationalstandards.2热水管道应选用耐腐蚀和安装连接方便可靠的管材，可采用薄壁不锈钢管、薄壁铜管、塑料热水管、复合热水管等。当采用塑料热水管或塑料和金属复合热水管材时，应符合下列规定：Hotwaterpipesshallbecorrosion-resistantandconvenientandreliableforinstallationandconnection.Thin-wallstainlesssteelpipes,thin-wallcopperpipes,plastichotwaterpipes,compositehotwaterpipes,etc.canbeused.Whenplastichotwaterpipesorplastic-metalcompositehotwaterpipesareused,thefollowingrequirementsshallbemet:1）管道的工作压力应按相应温度下的许用工作压力选择；Theworkingpressureofthepipesshallbeselectedaccordingtotheallowableworkingpressureatthecorrespondingtemperature;2）设备机房内的管道不应采用塑料热水管。Plastichotwaterpipesshallnotbeusedforpipesintheequipmentroom.二、热水供应系统的附件FittingsoftheHotWaterSupplySystem1.自动温度调节装置Automatictemperatureregulator热水供应系统中为实现节能节水、安全供水，在水加热设备的热媒管道上应装设自动温度调节装置来控制出水温度。Tosaveenergyandwaterandsupplywatersafelyinthehotwatersupplysystem,anautomatictemperatureregulatorshallbeinstalledontheheatmediumpipeofthewaterheatingequipmenttocontroltheoutletwatertemperature.二、热水供应系统的附件FittingsoftheHotWaterSupplySystem2.疏水器Steamtrap热水供应系统以蒸汽作热媒时，为保证凝结水及时排放，同时又防止蒸汽漏失，用蒸汽作热媒间接加热的水加热器应在每台开水器凝结水回水管上单独设疏水器，蒸汽立管最低处、蒸汽管下凹处的下部应设疏水器。Whenthesteamisusedastheheatmediuminthehotwatersupplysystem,toensuretimelydischargeofcondensateandpreventsteamleakage,asteamtrapshallbeprovidedonthecondensatereturnpipeofeachsteam-consumingequipment(suchaswaterheaterandwaterboiler).Asteamtrapshallalsobeprovidedatthelowestpartoftheverticalsteampipeandthelowerconcavepartofthesteampipe.二、热水供应系统的附件FittingsoftheHotWaterSupplySystem3.减压阀Pressure-reducingvalve热水供应系统中的加热器常以蒸汽为热媒，若蒸汽管道供应的压力大于水加热器的承压能力，则应设减压阀把蒸汽压力降到需要值，才能保证设备使用安全。Thesteamisoftenusedastheheatmediuminthehotwatersupplysystem.Ifthepressuresuppliedbythesteampipesisgreaterthanthepressure-bearingcapacityofthewaterheater,apressure-reducingvalveshallbesettoreducethesteampressuretotherequiredvaluesoastoensurethesafeuseoftheequipment.二、热水供应系统的附件FittingsoftheHotWaterSupplySystem4.自动排气阀Automaticexhaustvalve为排除热水管道系统中热水汽化产生的气体（溶解氧和二氧化碳），以保证管内热水畅通，防止管道腐蚀，配水干管和立管最高点应设置排气阀。Toreleasethegas(dissolvedoxygenandcarbondioxide)generatedduringthevaporizationofhotwaterinthehotwaterpipesystem,ensuresmoothflowofhotwaterinthepipe,andpreventthecorrosionofpipes,anautomaticexhaustvalveshallbesetatthehighestpointofthemainwaterdistributionpipesandstandpipes.

二、热水供应系统的附件FittingsoftheHotWaterSupplySystem5.膨胀管、膨胀水罐和安全阀Expansionpipe,expansiontankandsafetyvalve在集中热水供应系统中，冷水被加热后，水的体积要膨胀，如果热水系统是密闭的，在卫生器具不用水时，必然会增加系统的压力，有胀裂管道的危险，因此需要设置膨胀管、安全阀或膨胀水罐。Inthecentralizedhotwatersupplysystem,aftercoldwaterisheated,thevolumeofwaterwillexpand.Ifthehotwatersystemisclosed,thepressureofthesystemwillinevitablyincreasewhenthesanitarywaredoesnotneedwater,andthereisariskofthepipesbursting.Therefore,itisnecessarytosetexpansionpipes,safetyvalvesorexpansiontanks.安全阀Safetyvalve安全阀Safetyvalve二、热水供应系统的附件FittingsoftheHotWaterSupplySystem6.自然补偿管道和伸缩器Naturalcompensationpipeandexpansionpiece热水供应系统中管道因受热膨胀而伸长，为保证管网使用安全，在热水管网上应采取补偿管道温度伸缩的措施，以避免管道因为承受了超过自身所许可的内应力而导致弯曲甚至破裂。Thepipesinthehotwatersupplysystemelongateduetothermalexpansion.Inordertoensurethesafetyofthenetwork,measuresshallbetakentocompensateforthetemperatureexpansionofthepipesinthehotwaternetworktoavoidbendingorevenruptureofthepipesbecausetheybearaninternalstressexceedingtheirallowablevalue.伸缩器Expansionpiece伸缩器Expansionpiece二、热水供应系统的附件FittingsoftheHotWaterSupplySystem6.自然补偿管道和伸缩器Naturalcompensationpipeandexpansionpiece补偿管道热伸长技术措施有两种，即自然补偿和设置伸缩器补偿。Therearetwotechnicalmeasurestocompensateforthethermalelongationofpipes,namelynaturalcompensationandsettingoftheexpansionpiece.自然补偿即利用管道敷设自然形成的L型或Z型弯曲管段，来补偿管道的温度变形。NaturalcompensationistocompensateforthetemperaturedeformationofpipesbyusingL-shapedorZ-shapedbendingpipesectionsnaturallyformedduringthelayingofpipes.管道自然补偿Pipethermalcompensation二、热水供应系统的附件FittingsoftheHotWaterSupplySystem当直线管段较长，不能依靠管路弯曲的自然补偿作用时，每隔一定的距离应设置不锈钢波纹管、波型伸缩器、多球橡胶软管等伸缩器、可曲挠橡胶接头来补偿管道伸缩量。Whenthestraightpipesectionislongandcannotrelyonthenaturalcompensationofpipesbending,corrugated

stainlesssteelpipes,corrugatedexpansionpieces,multi-ballrubberhoses