pumps calc

Download Pumps Calc

Post on 17-Feb-2016

234 views

Category:

Documents

9 download

Embed Size (px)

DESCRIPTION

Calculos de sistemas de bombeo

TRANSCRIPT

Pumps

HomeChapter 5: PumpsRules of Thumb for Chemical Engineers, 5th Editionby Stephen HallThis Excel workbook includes Visual Basic for Application function subroutines.Macros must be enabled for them to work.

System Curve 1InputsUS UnitsSI UnitsPumped liquidWaterWaterTemperature86.0F30.0CHead pressure0.0psig0.0kPa - gaugeDischarge pressure0.0psig0.0kPa - gaugeLiquid height above datum12.0ft4.0mPump suction height above datum1.5ft(0.5)mPump discharge height above datum23.07.0mFlow rate180,000.0lb/h80,800.0kg/hSuction pipe inside diameter4.0in100.0mmEquivalent length of suction pipe27.0ft8.5mDischarge pipe inside diameter3.0in75.0mmEquivalent length of discharge pipe150.0ft45.0mRoughness0.00015ft0.0000457mOutputSuction Pipe - Line 215Reynolds Number349,636353,818Friction Factor0.01780.0179Pressure Drop due to friction0.79psi6.25kPaDischarge Pipe - Line 216Reynolds Number469,211471,758Friction Factor0.01840.0185Pressure Drop due to friction19.79psi144.09kPaVapor Pressure0.62psia4.26kPaViscosity0.81cP0.81mPa-sDensity62.56lb/ft3992.61kg/m3NPSH availableHead pressure33.9ft fluid10.4m fluidFluid pressure10.54.5m fluidFriction loss(1.8)(0.6)m fluidVapor pressure reduction(1.4)(0.4)m fluid41.1ft fluid13.8m fluidTotal Dynamic HeadSuction PressureHead pressure33.9ft fluid10.4m fluidFluid pressure10.5ft fluid4.5m fluidFriction loss(1.8)ft fluid(0.6)m fluidNet Suction Pressure42.5ft fluid14.3DischargeHead pressure33.9ft fluid10.4m fluidFluid pressure21.5ft fluid7.5m fluidFriction loss45.6ft fluid14.8m fluidNet Discharge Pressure101.0ft fluid32.7m fluid0.2839506173Differential Pressure (TDH)58.42ft fluid18.45m fluidTo construct a system curve, calculate the TDH at a number of flow rates then plot on a Scatter ChartThis can be done by replicating the column of inputs and calculations in Column D (or Column G) several times, each with a different flow rate.Or, a simple macro can perform the task, shown belowGoulds Pumps Model 3196, Size 3x4-7, 3560 rpmEfficiencyOperating PointSensitivityMinimum FlowHorsepowerNPSH requiredFlow RateTDHFlow RateTDHTDHFlow RateImpeller55.566.562%67%70%5.375" impeller55.566.5All at Flow Rate = 180000 lb/h15 hp20 hp25 hp9.5 ft10 ft11 ft12 ft14 ftkg/hm fluidlb/hft fluidreduced LeqgpmgpmTDHgpmTDHgpmTDHgpmTDHgpmTDHgpmTDHPowerCaseTDHNotegpmTDHgpmTDHgpmTDHgpmTDHgpmTDHgpmTDHgpmTDHgpmTDHgpmTDH5,000325,000121250501071301511710123.98.6107.2147106544129.7297998918154.3891833423181.1928610059Base58.110,000350,000151410010010512714917036080115.9120.410.5104.1860465116126.0651162791150.0279069767176.0744186047Remove piping contingency48.5Suction length = 19 ft; discharge length = 120 ft(0.17)871051701722701844001761701022509433084380794306420,000475,1002018150150103124147169231.9112.612.197.4364521363117.8981070849140.3084910763164.6676041103Reduce tank level to 054.5(0.06)1131762501403501574501582001253001353601034151004708030,0005100,2002623200200100120.5144167347.898.313.385.0621957815102.9252568956122.4895619254143.7551108707Tank level 0 with contingency64.10.1030012545012150013725016335019540014244012051010440,0007125,20034302502509611614116427020032320036519036096.313.583.3315305571100.831151974119.9974040022140.83028664143501115707760010027018243818846014054012850,0009150,300443830030089110136159260170313162360180463.87214.362.3039480875.387777176989.7176852353105.29367225534009847616057518060,00012175,4005647350350811041271522751253451153581604508749018070,00015180,500584936040071951181433001003751013851385007680,00018200,50069584004426086109132345784121004001335506790,00022220,50081674394757610012340076450105425130100,00026240,50094774795128911245080500118475135110,00031260,5001088951955010050088550132530154120,00036280,500123101559130,00042300,500140114599140,00048320,500157128639150,00055340,500176143679

Problem Statement:Create a System Curve and Pump Curves at 3600 rpm

System Curve 1

SystemFlow Rate, kg/hTDH, m fluidSystem Curve

System Curve 2

Flow Rate, gpmTDH, ft fluidSystem Curve

Control Valve

5 in5.5 in6 in6.5 inEquiv Length reduced 20%Control Valve Pressure DropSystem5 inch5.5 Inch6 inch6.5 inchOperating PointLower SystemFlow Rate, gpmTDH, ft fluidSystem and Pump CurvesANSI Size 3x4-7 at 3560 rpm

Power00000000000000000000000000000000000000000000000000000000000000000000000000000000000

62%67%70%System5 inch5.5 Inch6 inch6.5 inch62% Eff67% Eff70% EffOperating PointFlow Rate, gpmTDH, ft fluidSystem and Pump CurvesANSI Size 3x4-7 at 3560 rpm

Temp RiseInputsUS UnitsSI UnitsPumped liquidWaterWaterTemperature86.0F30.0CHead pressure0.0psig0.0kPa - gaugeDischarge pressure0.0psig0.0kPa - gaugeLiquid height above datum12.0ft4.0mPump suction height above datum1.5ft(0.5)mPump discharge height above datum23.07.0mFlow rate180,000.0lb/h80,800.0kg/hSuction pipe inside diameter4.0in100.0mmEquivalent length of suction pipe27.0ft8.5mDischarge pipe inside diameter3.0in75.0mmEquivalent length of discharge pipe150.0ft45.0mRoughness0.00015ft0.0000457mOutputSuction Pipe - Line 215Reynolds Number349,636353,818Friction Factor0.01780.0179Pressure Drop due to friction0.79psi6.25kPaDischarge Pipe - Line 216Reynolds Number469,211471,758Friction Factor0.01840.0185Pressure Drop due to friction19.79psi144.09kPaVapor Pressure0.62psia4.26kPaViscosity0.81cP0.81mPa-sDensity62.56lb/ft3992.61kg/m3NPSH availableHead pressure33.9ft fluid10.4m fluidFluid pressure10.54.5m fluidFriction loss(1.8)(0.6)m fluidVapor pressure reduction(1.4)(0.4)m fluid41.1ft fluid13.8m fluidTotal Dynamic HeadSuction PressureHead pressure33.9ft fluid10.4m fluidFluid pressure10.5ft fluid4.5m fluidFriction loss(1.8)ft fluid(0.6)m fluidNet Suction Pressure42.5ft fluid14.3DischargeHead pressure33.9ft fluid10.4m fluidFluid pressure21.5ft fluid7.5m fluidFriction loss45.6ft fluid14.8m fluidNet Discharge Pressure101.0ft fluid32.7m fluid0.2839506173Differential Pressure (TDH)58.42ft fluid18.45m fluidTo construct a system curve, calculate the TDH at a number of flow rates then plot on a Scatter ChartThis can be done by replicating the column of inputs and calculations in Column D (or Column G) several times, each with a different flow rate.Or, a simple macro can perform the task, shown belowGoulds Pumps Model 3196, Size 3x4-10 at 1770 rpmEfficiencyOperating PointSensitivityMinimum FlowHorsepowerNPSH requiredFlow RateTDHFlow RateTDHTDHFlow RateImpeller67899.71070%68%65%60%55%5.375" impeller55.566.5All at Flow Rate = 180000 lb/h3 hp5 hp7.5 hp10 hp2 ft3 ft4 ft5 ft6 ft7 ftkg/hm fluidlb/hft fluidreduced LeqgpmgpmTDHgpmTDHgpmTDHgpmTDHgpmTDHgpmTDHgpmTDHgpmTDHPowerCaseTDHNotegpmTDHgpmTDHgpmTDHgpmTDHgpmTDHgpmTDHgpmTDHgpmTDHgpmTDHgpmTDHgpmTDH5,000325,000121250253751.570.591106.1875115.32391102151151851160123.98.6107.2147106544129.7297998918154.3891833423181.1928610059Base58.110,000350,00015141005036517090.5105.75114.923810021010018110536080115.9120.410.5104.1860465116126.0651162791150.0279069767176.0744186047Remove piping contingency48.5Suction length = 19 ft; discharge length = 120 ft(0.17)2730875885878711526010714113023712529012133712037611042510020,000475,10020181501003449.66989.6104.725113.8240902089017593231.9112.612.197.4364521363117.8981070849140.3084910763164.6676041103Reduce tank level to 054.5(0.06)50115150461757017599.532585143110230100284100330100375854208030,0005100,200262320015030.546.56687.7102.2625111274110241802058016880347.898.313.385.0621957815102.9252568956122.4895619254143.7551108707Tank level 0 with contingency64.10.1020037.522559.52508337570.514680224802818032880350523906040,0007125,200343025020026436383.598.9375108.227510025068203701637023017.536096.313.583.3315305571100.831151974119.9974040022140.830286641425028.527548300694385514765223602795432460300333755050,0009150,300443830025020385879941032809626060202631606327521.5463.87214.362.3039480875.387777176989.7176852353105.293672255330020.53253635054.5130502204625038300432502032534.560,00012175,400564735030012.53051.572.587.8125972859427057218501665030024330153702540038.595301852521222229202551870,00015180,5005849360325264869.584.8125942959027956237441753732526.580,00018200,50069584003504465.58190.33038930059.526242192283402990,00022220,50081674393756277.187586.331089325653004321226100,00026240,50094774794005873.2582.432590.33507332545.527529110,00031260,500108895194256878.533090.637580.53755436038120,00036280,50012310155945074.4360984008950075130,00042300,500140114599140,00048320,5001571286390.625150,00055340,500176143679Speed ControlFor the selected impeller size, 8.6 inch, construct curves at different speedsSpeed, rpm1770150012501000750gpmTDHgpmTDHgpmTDHgpmTDHgpmTDH2583215918411426111550824259354128262115100818558714156264215150791275710639852564142007516954141381132485142507121251177351412310613300642544621232169201271232561275442303018419138113505729741247281981814810375533183826526212171599400483393428224226151699425413602930020240131807Best Efficiency Point292742796523647197321582111812

Primary Input Variable5 in5.5 in6 in6.5 inEquiv Length reduced 20%62%67%70%15 hp20 hp25 hp9.5 ft10 ft11 ft12 ft14 ftMin. FlowSystem5 inch5.5 Inch6 inch6.5 inchOperating PointLower System62% Eff67% Eff70% EffMin Flow15 hp20 hp25 hp9.5 ft10 ft11 ft12 ft14 ftFlow Rate, gpmTDH, ft fluidSystem and Pump CurvesANSI Size 3x4-7 at 3560 rpm00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000Refresh Table of ResultsRefresh Table of ResultsThis is the same calculation, but with the equivalent length of the piping reduced by 20% to take out the contingencyProblem Statement:Create a System Curve and Pump Curves at 1800 rpm

Temp Rise0000000000000000

SystemFlow Rate, kg/hTDH, m fluidSystem Curve

NPSH - Lift00000000000

Flow Rate, gpmTDH, ft fluidSystem Curve

NPSH -