Centrifugal Pump Calculation SpreadsheetIntroductionThis spreadsheet can be used to specify centrifugal pumps - including assessing 'Net PositiveSuction Head' (NPSH) and power reuirements!The spreadsheet is split into the following sections- " #How to $se This %alculation# &or'sheet- The Pump %alculation &or'sheet itself!(t is recommended that the user first reads the 'How to $se This %alculation' wor'sheet beforestarting a calculation!Revision)ev! * (nitial issue *+-,ct--.)ev! *" %osmetic changes only (spell chec'ing / revised disclaimer) *0-1ec--.with all areas of process engineering2 calculations should bechec'ed by a competent engineer!Disclaimer:This calculation provides an estimate for specifying pumps!&e cannot be held responsible for its use!"s 1isclaimer3This calculation provides an estimate for specifying pumps!&e cannot be held responsible for its use!"s with all areas of process engineering2 calculations should bechec'ed by a competent engineer!Centrifugal Pump Calculation Spreadsheet)evision *"HOW TO US THIS C!"CU"!TIO#$%& IntroductionThis spreadsheet can be used to specify centrifugal pumps - in particular the 'Net Positive Suction Head' (NPSH) and the pump power reuirements!The calculation is split into three wor'sheet!The 'ey wor'sheet is the one entitled #Pump %alculation#3 in addition2there are two other wor'sheets which can be used to calculate the suction side and discharge side pressure drops - although these wor'sheets do not have to be used!The following colour coding is used in this calculation34o5es shaded light green reuire a user input!4o5es shaded light blue give a calculated output!'%& Pump Calculation Wor(sheet2.1 Pump Tag No. / Calculation DescriptionThe spreadsheet leaves space to add an euipment tag number for the pump and a description of thecalculation (or a description of the pump)!"lthough these items are not strictly necessary2 they help describe the calculation - this can be invaluable it is to be chec'ed by another engineer!2.2 Pump DetailsThe user enters the number of pumps operating and the pump speed!The number of pumps operating is The spreadsheet allows one of two pump speeds to be selected3 *60- rpm and +.-- rpm!This information is not strictly necessary (it's used to estimate the reuired NPSH which can be over written anyway)!2.3 Liquid PropertiesThe user inputs physical property data of the liuid and the operating temperature of the pump!2.3.1 ViscosityThe user enters the liuid viscosity in %entipoise (%p)!(t should be noted that viscosity changes with temperature - thus the user must ensure that the viscosity value enteredmust be at the correct temperature! 2.3.2 Densitydensity at the pump operating temperature!2.3.3 Vapour PressureThe user enters the liuid vapour pressure in bar absolute of the liuid!"gain2 this datashould be at the pump operating temperature!"s the vapour pressure is a strong functionof temperature2 it is important that the data is accurate!(f in doubt2 it is safer to over-estimate the liuid vapour pressure!2.4 FlowratesThe user enters the total liuid flowrate in 'g per hour!The spreadsheet then calculates the totalwww!my%hem7!comreuired to calculate the flow per pump!Thus if the flowrate is *--m89h and there are two pumps operating2the flowrate per pump is 0-m89h!The user enters the liuid density in 'g9m8!"s with viscosity2 the user should enter the1isclaimer3This calculation provides an estimate for specifying pumps!&e cannot be held responsible for its use!"s with all areas of process engineering2 calculations should bechec'ed by a competent engineer!Centrifugal Pump Calculation Spreadsheet)evision *"www!my%hem7!com2. !uction !ide "#draulicsThis section of the wor'sheet allows the user to enter data on the suction side of the pump!The calculation assumes that the pump is fed from a vessel upstream!This arrangement is shown in :igure * below!2.5.1 Suction Vessel Operating PressureThe user enters the operating pressure of the Suction ;essel in bar absolute!:or vessels open to the atmosphere2 this will be atmospheric pressure (i!e! *!-*8 bar(a))!However2 the Suction ;essel may also be pressurised or undervacuum!(t is important that the correct pressure is used - especially if the vessel is under vacuum!2.5.2 Elevation of Suction Vessel from GradeThe user enters the elevation of the Suction ;essel above grade (or ground level) in metres - this is designated H* in :igure *!(f the vessel is below grade2the value is negative!2.5.3 Vessel lo li!uid levelThe user enters the Suction ;essel low liuid level in metres - this is designatedH+ in :igure *!The