6.3.1 熱水供應系統(tǒng) 的管材和管件選用 Selection of Pipes and Fittings of the Hot Water Supply System-1733558725611

6.3.1熱水供應系統(tǒng)的管材和管件選用SelectionofPipesandFittingsoftheHotWaterSupplySystem一、熱水供應系統(tǒng)的管材和管件PipesandFittingsoftheHotWaterSupplySystem1熱水系統(tǒng)采用的管材和管件，應符合國家現(xiàn)行標準的有關規(guī)定。管道的工作壓力和工作溫度不得大于國家現(xiàn)行標準規(guī)定的許用工作壓力和工作溫度。PipesandfittingsofthehotwatersupplysystemshouldcomplywiththerelevantprovisionsofprevailingChinesenationalstandards.Theworkingpressureandtemperatureofthepipesshallnotbegreaterthanthepermissiblevaluesspecifiedinprevailingnationalstandards.2熱水管道應選用耐腐蝕和安裝連接方便可靠的管材，可采用薄壁不銹鋼管、薄壁銅管、塑料熱水管、復合熱水管等。當采用塑料熱水管或塑料和金屬復合熱水管材時，應符合下列規(guī)定：Hotwaterpipesshallbecorrosion-resistantandconvenientandreliableforinstallationandconnection.Thin-wallstainlesssteelpipes,thin-wallcopperpipes,plastichotwaterpipes,compositehotwaterpipes,etc.canbeused.Whenplastichotwaterpipesorplastic-metalcompositehotwaterpipesareused,thefollowingrequirementsshallbemet:1）管道的工作壓力應按相應溫度下的許用工作壓力選擇；Theworkingpressureofthepipesshallbeselectedaccordingtotheallowableworkingpressureatthecorrespondingtemperature;2）設備機房內的管道不應采用塑料熱水管。Plastichotwaterpipesshallnotbeusedforpipesintheequipmentroom.二、熱水供應系統(tǒng)的附件FittingsoftheHotWaterSupplySystem1.自動溫度調節(jié)裝置Automatictemperatureregulator熱水供應系統(tǒng)中為實現(xiàn)節(jié)能節(jié)水、安全供水，在水加熱設備的熱媒管道上應裝設自動溫度調節(jié)裝置來控制出水溫度。Tosaveenergyandwaterandsupplywatersafelyinthehotwatersupplysystem,anautomatictemperatureregulatorshallbeinstalledontheheatmediumpipeofthewaterheatingequipmenttocontroltheoutletwatertemperature.二、熱水供應系統(tǒng)的附件FittingsoftheHotWaterSupplySystem2.疏水器Steamtrap熱水供應系統(tǒng)以蒸汽作熱媒時，為保證凝結水及時排放，同時又防止蒸汽漏失，用蒸汽作熱媒間接加熱的水加熱器應在每臺開水器凝結水回水管上單獨設疏水器，蒸汽立管最低處、蒸汽管下凹處的下部應設疏水器。Whenthesteamisusedastheheatmediuminthehotwatersupplysystem,toensuretimelydischargeofcondensateandpreventsteamleakage,asteamtrapshallbeprovidedonthecondensatereturnpipeofeachsteam-consumingequipment(suchaswaterheaterandwaterboiler).Asteamtrapshallalsobeprovidedatthelowestpartoftheverticalsteampipeandthelowerconcavepartofthesteampipe.二、熱水供應系統(tǒng)的附件FittingsoftheHotWaterSupplySystem3.減壓閥Pressure-reducingvalve熱水供應系統(tǒng)中的加熱器常以蒸汽為熱媒，若蒸汽管道供應的壓力大于水加熱器的承壓能力，則應設減壓閥把蒸汽壓力降到需要值，才能保證設備使用安全。Thesteamisoftenusedastheheatmediuminthehotwatersupplysystem.Ifthepressuresuppliedbythesteampipesisgreaterthanthepressure-bearingcapacityofthewaterheater,apressure-reducingvalveshallbesettoreducethesteampressuretotherequiredvaluesoastoensurethesafeuseoftheequipment.二、熱水供應系統(tǒng)的附件FittingsoftheHotWaterSupplySystem4.自動排氣閥Automaticexhaustvalve為排除熱水管道系統(tǒng)中熱水汽化產生的氣體（溶解氧和二氧化碳），以保證管內熱水暢通，防止管道腐蝕，配水干管和立管最高點應設置排氣閥。Toreleasethegas(dissolvedoxygenandcarbondioxide)generatedduringthevaporizationofhotwaterinthehotwaterpipesystem,ensuresmoothflowofhotwaterinthepipe,andpreventthecorrosionofpipes,anautomaticexhaustvalveshallbesetatthehighestpointofthemainwaterdistributionpipesandstandpipes.

二、熱水供應系統(tǒng)的附件FittingsoftheHotWaterSupplySystem5.膨脹管、膨脹水罐和安全閥Expansionpipe,expansiontankandsafetyvalve在集中熱水供應系統(tǒng)中，冷水被加熱后，水的體積要膨脹，如果熱水系統(tǒng)是密閉的，在衛(wèi)生器具不用水時，必然會增加系統(tǒng)的壓力，有脹裂管道的危險，因此需要設置膨脹管、安全閥或膨脹水罐。Inthecentralizedhotwatersupplysystem,aftercoldwaterisheated,thevolumeofwaterwillexpand.Ifthehotwatersystemisclosed,thepressureofthesystemwillinevitablyincreasewhenthesanitarywaredoesnotneedwater,andthereisariskofthepipesbursting.Therefore,itisnecessarytosetexpansionpipes,safetyvalvesorexpansiontanks.安全閥Safetyvalve安全閥Safetyvalve二、熱水供應系統(tǒng)的附件FittingsoftheHotWaterSupplySystem6.自然補償管道和伸縮器Naturalcompensationpipeandexpansionpiece熱水供應系統(tǒng)中管道因受熱膨脹而伸長，為保證管網使用安全，在熱水管網上應采取補償管道溫度伸縮的措施，以避免管道因為承受了超過自身所許可的內應力而導致彎曲甚至破裂。Thepipesinthehotwatersupplysystemelongateduetothermalexpansion.Inordertoensurethesafetyofthenetwork,measuresshallbetakentocompensateforthetemperatureexpansionofthepipesinthehotwaternetworktoavoidbendingorevenruptureofthepipesbecausetheybearaninternalstressexceedingtheirallowablevalue.伸縮器Expansionpiece伸縮器Expansionpiece二、熱水供應系統(tǒng)的附件FittingsoftheHotWaterSupplySystem6.自然補償管道和伸縮器Naturalcompensationpipeandexpansionpiece補償管道熱伸長技術措施有兩種，即自然補償和設置伸縮器補償。Therearetwotechnicalmeasurestocompensateforthethermalelongationofpipes,namelynaturalcompensationandsettingoftheexpansionpiece.自然補償即利用管道敷設自然形成的L型或Z型彎曲管段，來補償管道的溫度變形。NaturalcompensationistocompensateforthetemperaturedeformationofpipesbyusingL-shapedorZ-shapedbendingpipesectionsnaturallyformedduringthelayingofpipes.管道自然補償Pipethermalcompensation二、熱水供應系統(tǒng)的附件FittingsoftheHotWaterSupplySystem當直線管段較長，不能依靠管路彎曲的自然補償作用時，每隔一定的距離應設置不銹鋼波紋管、波型伸縮器、多球橡膠軟管等伸縮器、可曲撓橡膠接頭來補償管道伸縮量。Whenthestraightpipesectionislongandcannotrelyonthenaturalcompensationofpipesbending,corrugated

stainlesssteelpipes,corrugatedexpansionpieces,multi-ballrubberhoses