SAE AS1637 Hose Assembly, Convoluted, Polytetrafluoroethylene, Metallic Reinforced Conductive, Flareless, 45掳 to 90掳

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【英文标准名称】:Industrial-processcontrolvalves-Noiseconsiderations-Controlvalveaerodynamicnoisepredictionmethod-Controlvalveaerodynamicnoisepredictionmethod
【原文标准名称】:工业流程控制阀.噪声.控制阀气动噪声预测法
【标准号】:BSEN60534-8-3-2000
【标准状态】:现行
【国别】:英国
【发布日期】:2000-12-15
【实施或试行日期】:2000-12-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:空气动力学的;校正装置;管道;流体工程;控制阀;噪声测量;空气噪声;液体流动;空气噪声测量;定义;声压级;噪声辐射;实验室试验;数学计算;阀门;过程控制;过程测量和控制技术;试验;方向控制阀;电气工程;声学测量;计算方法;噪声;测量
【英文主题词】:Acousticmeasurement;Aerodynamicflow;Aerodynamical;Airbornenoise;Controlvalves;Correctingunits;Definition;Definitions;Direction-controlvalves;Electricalengineering;Fluidengineering;Laboratorytesting;Laboratorytests;Liquidflow;Mathematicalcalculations;Measurement;Measurementofairbornenoise;Methodsofcalculation;Noise;Noiseemissions;Noisemeasurements;Pipelines;Processcontrol;Processmeasuringandcontroltechnology;Soundpressurelevel;Testing;Valves
【摘要】:ThispartofIEC60534establishesatheoreticalmethodtopredicttheexternalsound-pressurelevelgeneratedinacontrolvalveandwithinadjacentpipeexpandersbytheflowofcompressiblefluids.Thismethodconsidersonlysingle-phasedrygasesandvapoursandisbasedontheperfectgaslaws.Thisstandardaddressesonlythenoisegeneratedbyaerodynamicprocessesinvalvesandintheconnectedpiping.Itdoesnotconsideranynoisegeneratedbyreflections,mechanicalvibrations,unstableflowpatternsandotherunpredictablebehaviour.Itisassumedthatthedownstreampipingisstraightforalengthofatleast2mfromthepointwherethenoisemeasurementismade.Thismethodisvalidonlyforsteelandsteelalloypipes(seeequations(38)and(40)in5.6).Themethodisapplicabletothefollowingsingle-stagevalves:globe(straightpatternandanglepattern),butterfly,rotaryplug(eccentric,spherical),ball,andvalveswithcagetrims.SpecificallyexcludedarethefullboreballvalveswheretheproductFPCexceeds50%oftheratedflowcoefficient.Forlimitationsonspeciallownoisetrimsnotcoveredbythisstandard,see6.5.WhentheMachnumberinthevalveoutletexceeds0,3forstandardtrimor0,2forlownoisetrim,theprocedureinclause7isused.TheMachnumberlimitsinthisstandardareasfollows:
【中国标准分类号】:N16
【国际标准分类号】:17_140_20;23_060_40
【页数】:60P.;A4
【正文语种】:英语


【英文标准名称】:Cheeseandprocessedcheeseproducts-Determinationoffatcontent-Gravimetricmethod(Referencemethod)(ISO1735:2004);GermanversionENISO1735:2004
【原文标准名称】:乳酪及融化干酪制品.脂肪含量测定.重量分析法(参照法)
【标准号】:DINENISO1735-2005
【标准状态】:现行
【国别】:德国
【发布日期】:2005-05
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:含量测定;试验设备;油萃取法;含量;重量分析;定义;斯密得-邦得其斯基-拉之拉夫;经过处理的乳酪;抽样方法;乳制品;化合物;基准方法;方法;试验;食品检验;食品;化学分析和试验;脂肪含量测定;斯密得-邦得其斯基-拉之拉夫法
【英文主题词】:
【摘要】:
【中国标准分类号】:X16
【国际标准分类号】:67_100_30
【页数】:21P;A4
【正文语种】:德语