DP-Flow-training

差压流量产品基础培训差压流量产品基础培训1.基础回顾–了解流量术语和道具–理解差压流量方程式的由来–理解差压是如何进行流量测量2.RosemountDPFlowProductOverview–了解Rosemount能提供的一次元件–了解Rosemount能提供的二次仪表–了解Rosemount能提供的连接部件–了解Rosemount能提供的一体化流量计3.HowtocontactwithManilaTeam4.Howtoprovideasatisfiedproposal差压流量产品基础培训术语DPFlow差压流量Fluid流体介质Standardvs.ActualConditions标准和实际工况Density密度VolumetricFlow体积流量MassFlow质量流量StandardVolumetricFlow标准体积流量Idealvs.RealGasLawforGasandSteamCompressibilityFactor压缩系数Viscosity粘性VelocityProfile速度曲线ReynoldsNumber雷诺数差压流量:定义差压流量计是指通过测量流体通过限流元件而形成的差压计算流量一次元件二次仪表连接系统流体定义:一种物质可以连续变形，并在外力作用下流动.流体类型–液体•纯净液体,肮脏液体,粘稠液体,浆液–气体•例如:空气，氮气，天然气–蒸汽•过热蒸汽，饱和蒸汽流量计针对三种不同的流体类型具有不同的适用和性能Actualvs.StandardConditions实际工况–流动条件是管道内实际的压力和温度条件标准工况–预先设定的压力和温度条件。例如参考或基础工况。StandardReferencePressureReferenceTemperatureNormalCubicMeter101.325kpA0°CStandardCubicmeter101.325kpA15.556°CStandardCubicFoot(U.S.gasindustry)14.73psia60°FStandardCubicFoot(U.S.otherindustry)14.696psia*60°F*ISOStandard5024101.325kpA14.696psia15°C59°FStandardsmayvaryfromindustrytoindustry.StandardpressureandtemperatureshouldbestatedonspecificationsheetDensity密度(r)定义:单位体积流体的质量–密度=质量/体积(r)–通用单位:lb/ft3orkg/m3AlsoknownasActualDensityorFlowingDensity(rf)液体的压缩可以忽略不计.Standardorbasedensity(rb)isthedensityatapredefinedreferencepressureandtemperature.NOTnormaloperatingpressureandtemperature.–Standarddensity=mass/standardvolumeLiquidsGasesTemperature=DensityTemperature=DensityPressure=NegligiblePressure=NegligiblePressure=DensityPressure=DensityTemperature=DensityTemperature=Density体积流量(Qv)定义:在规定时间内通过测量点的流体体积体积流量=v*A=速度×管道横截面积–通用单位:ft3/min(cfm),m3/hr质量流量(Qm)定义:在规定时间内通过测量点的流体质量.–质量流量=v*A*rf=速度×管道横截面积×密度–通用单位:Lbm/hr,kgm/hrDPmetersderivemassflowratethough–输入一个设定的流体密度–或进行温度和压力补偿粘度()定义:粘度是衡量一种流体抵抗剪切力和流动的倾向–Commonunits:poise(cm/g/sec)orcentipoise(cp).Viscosityishighlytemperaturedependent.•Wateris1cP,peanutbutteris10,000cPForceFixedPlateMovingPlateLiquidsGasesTemperature=ViscosityTemperature=ViscosityTemperature=ViscosityTemperature=Viscosity速度曲线定义:流体速度从管道的一侧到另一侧的改变状态.Alsoreferredtoasflowprofile.Atagivenpoint,afluidwillhaveoneofthefollowingthreeprofilesAccuracyStatementsforflowmetersarebasedonthesteadyflowofahomogenous,single-phasefluidwithaflowprofileidenticaltotheoneatwhichtheaccuracytestingwaspreformed.Formostflowmeters,thisisturbulentflow.层流.......过渡流..........紊流速度增加ZeroFlowDefinition:流体的惯性力与粘性力的比率–Units:DimensionlessVelocityprofileisdeterminedbyReynoldsNumber.–Laminar-RD2,000–Transition-RD2,000-4,000–Turbulent-RD4,000rVDRDr=流体密度V=流速D=管道内径=流体粘度雷诺数(RD)雷诺数是用来效验流量计是否适用THEREVOLUTIONRosemountDPFlow差压一次元件的广阔范围阿牛巴2”to72”50mmto1800mm孔板2”to30”50mmto750mm紧凑型孔板½”to8”10mmto200mm85%的差压流量市场所选用的一次元件一体化孔板½”to1½”10mmto40mm1999ARCUnitStudy罗斯蒙特公司提供的一次元件可以覆盖85%的差压流量市场Nozzle4%Venturi4%V-cone3%Wedge2%Other1%孔板56%平均皮托管18%一体化孔板12%SOURCE:DSG,1998孔板,平均皮托管,一体化孔板=85%的一次性元件Model1195IntegralOrifice1195型一体化孔板1195型一体化孔板的优点可以提供预装罗斯蒙特压力变送器提供众多的过程连结和结构材料选择可用于宽广流量范围使用的孔板无需使用移动部件从而使维护更加轻松符合NACEMR01-75(90)标准可提供316不锈钢，哈氏合金或蒙乃尔合金等材料的接液部件自定心设计特殊设计确保孔板与管线同心由于工厂校准流量系数与孔板的位置有关，因此孔板与管线同心非常重要例如，3%的偏心就能造成0.25~1.5%的β值误差*MillersFlowHandbook1195一体化孔板--精确的小管线测量过程连接选项管线连接方式有螺纹，焊接或法兰最好的性能专门为高精度小孔流量测量设计，只需最少的安装和维护减少管径的变化每支管线内表面都经过抛光处理排除内径的测量误差自定心设计客户的法兰和螺钉构成能确保孔板可靠的定心，从而保证流量的测量精度降低安装费用直接连接取消了一次元件和电子部件之间连接装置SpecificationsLinesize:½”to1½”(10mmto15mm)Directmountpressurelimit:1440psi(100bar)Idealfluids:Liquid,Gas&SteamDirectmounttemp:450ºF(260°C)Remotemounttemp:1250ºF(675°C)Material:316SS&HastelloyModelNumberOutlineBodyMaterialS316LSSTHHastelloy-CLineSize0051/2Inch(Sch40Std./Sch80ifNPT)DN150101Inch(Sch40Std./Sch80ifNPT)DN2501511/2Inch(Sch80Std)DN40ModelNumberOutlineProcessConnectionBody-OnlyAssembliesS1SocketWeldBodyT1NPTFemaleThreadedBodyPipedAssembliesA1ANSIClass150RFFlange(DefaultdependingonStaticPressure)A3ANSIClass300RFFlangeA6ANSIClass600RFFlangeP1NPTThreadedPipeP2PipeendspreparedforweldingD1DINPN16D2DINPN40D3DINPN100P9SpecialProcessConnectionModelNumberOutlinePlateMaterialS316/316LSST(Default)HHastelloyC-276MMonelModelNumberOutline1/2InchStandardPlates00100.010inch00140.014inch00200.020inch00340.034inch00660.066inch01090.109inch01600.160inch01960.196inch02600.260inch03400.340inchModelNumberOutlineBoreSize1InchStandardPlates01500.150inch02500.250inch03450.345inch05000.500inch06300.630inch08000.800inch11/2InchStandardPlates02950.295inch03760.376inch05120.512inch07480.748inch10221.022inch11841.184inchTransmitterMountingBoltLengthA1.0InchCSGr8Bolts(Default)B21/4InchCSGr8Bolts(Fordirectmount3051/3095)C1.0InchASTMA193GrB8(304SST)BoltsD21/4InchASTMA193GrB8(304SST)BoltsE1.0InchASTMA193GrB7M(NACE)BoltsF21/4InchASTMA193GrB7M(NACE)BoltsG1.0InchCSGr8BoltswithHighTempGasket-upto454degC(standardtemplimitis232degC)Note:Forremotemount,thisoptionwillnotaffecttheboltlengthbutithavetobechoseninorderforthemodelno.tobevalid.ModelNumberOutlineOptionsTemperatureSensor,Calibration,AssembletotransmitterTRRemoteThermowellandRTDTXRemoteThermowellandRTD,FMExplosion-ProofApprovalT9SpecialTemperatureSensorCLDischargeCoefficientverificatio