application 291 en 2 - krohnekrohne.com/fileadmin/content/files-2/ctry_global/application... ·...

Non-contact Level measurement on asphalt paving mixture storage tanks • Accurate level measurement of sticky, viscous products • High reliability even with high temperatures, dense vapours and agitation • Reduced maintenance due to non-contact measurement 1. Background An American equipment supplier offers a complete range of liquid asphalt concrete (AC) storage tanks and accessories for polymer modiﬁed asphalts. Asphalt, also called bitumen, is a sticky, black and highly viscous liquid or semi-solid that is present in most crude petroleums. Liquid AC is hot and has a low dielectric constant, which decreases as the temperature goes up. In the past, a TDR guided radar system from a competitor had been used to determine the level in the tanks. The TDR cable needed frequent cleaning which was a safety hazard because the tanks were hot and could only be accessed by climbing. Another important disadvantage was that the measured values were unreliable during the ﬁlling and emptying process. Also, measurement accuracy for TDR is dependent on the coating thickness on the sensor. Other technologies such as differential pressure and laser had also been tested without success. 2. Measurement requirements Each tank has the shape of an upright barrel with a diameter of about 3.5 m and a total height of approx.15 m. It has heating coils at the bottom and an agitator in the center. There is a 150 mm thick insulation all over the tank top which includes a nozzle (Ø 150 mm / 250 mm high). The measuring device is to be installed on the nozzle and give accurate and reliable measuring values despite condensation from the hot product, its high viscosity and low dielectric constant. APPLICATION NOTE Chemical Industry 2 1 3 4 Inside of an asphalt storage tank: 1 Nozzle 2 Insulation 3 Agitator 4 Heating coils

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Page 1: Application 291 EN 2 - KROHNEkrohne.com/fileadmin/content/files-2/ctry_global/application... · Another important disadvantage was that the measured values were unreliable during

Non-contact Level measurement on asphalt paving mixture storage tanks

•Accuratelevelmeasurementofsticky,viscousproducts•Highreliabilityevenwithhightemperatures,densevapoursandagitation•Reducedmaintenanceduetonon-contactmeasurement

1. Background AnAmericanequipmentsupplieroffersacompleterangeofliquidasphaltconcrete(AC)storagetanksandaccessoriesforpolymermodifiedasphalts.Asphalt,alsocalledbitumen,isasticky,blackandhighlyviscousliquidorsemi-solidthatispresentinmostcrudepetroleums.LiquidACishotandhasalowdielectricconstant,whichdecreasesasthetemperaturegoesup.Inthepast,aTDRguidedradarsystemfromacompetitorhadbeenusedtodeterminethelevelinthetanks.TheTDRcableneededfrequentcleaningwhichwasasafetyhazardbecausethetankswerehotandcouldonlybeaccessedbyclimbing.Anotherimportantdisadvantagewasthatthemeasuredvalueswereunreliableduringthefillingandemptyingprocess.Also,measurementaccuracyforTDRisdependentonthecoatingthicknessonthesensor.Othertechnologiessuchasdifferentialpressureandlaserhadalsobeentestedwithoutsuccess.

2. Measurement requirements

Eachtankhastheshapeofanuprightbarrelwithadiameterofabout3.5mandatotalheightofapprox.15m.Ithasheatingcoilsatthebottomandanagitatorinthecenter.Thereisa150mmthickinsulationalloverthetanktopwhichincludesanozzle(Ø150mm/250mmhigh).Themeasuringdeviceistobeinstalledonthenozzleandgiveaccurateandreliablemeasuringvaluesdespitecondensationfromthehotproduct,itshighviscosityandlowdielectricconstant.

APPLICATION NOTE Chemical Industry

Inside of an asphalt storage tank: 1 Nozzle2 Insulation3 Agitator4 Heatingcoils

Application 291 EN 2.indd 1 19.11.2010 10:44:10 Uhr

Page 2: Application 291 EN 2 - KROHNEkrohne.com/fileadmin/content/files-2/ctry_global/application... · Another important disadvantage was that the measured values were unreliable during

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3. KROHNE solution

OPTIWAVE7300Cnon-contactRadar(FMCW)LevelMeterswithDN80HornAntenna.Connectiontypeis1½NPT.Thepartofthenozzlethatprotrudesfromthetankinsulationhasalsobeeninsulated.Thisnotonlyminimizescondensationoftheheavyasphaltvaporsonthehornantennabutalsopreventsfromcrustingasbitumentendstosolidifyatlowtemperatures.

4. Customer benefits

UsingFMCWradartechnology,themetersmeasureoverawidedynamicrange.Thatiswhyneitherthelowreflectivemediumnorthemovingsurfaceduringthefillingandemptyingofthetankscanaffectthemeasurement.Therequirementsofthecustomerintermsofreliabilityandaccuracyarefullymet.Climbingontopofthetanksforperiodiccleaningisnolongernecessary.Thenon-contactradardevicedoesnotrequireanymaintenance.Thissignificantlyreducestheexpenseand,addingthecompetitivepriceoftheOPTIWAVE7300C,makesitaverycosteffectivesolutionforthecustomer.Beinga2-wiredevice,theinstallationofthemeterneedslesswiringandisverysimpleduetothewizarddrivensetup.

5. Product used

OPTIWAVE 7300 C• Non-contactRadar(FMCW)LevelMeterforliquidsandpastes• 2-wirelooppoweredforminimalwiringexpense• Maintenance-free• Reliableandaccurate(±3mmupto10m)measurementevenintankswithagitatedsurfacesorinternalobjects

• Operatesuptoaprocessconnectiontemperatureof200°C• Measuringrangeupto80m• Dielectricconstant(εrvalue)A1.5• Antennascanbeextendedtosuitanynozzlelength• PACTwareforroutinechecks&commissioning• FMCWtechnology:optimizedcost/performanceratio• Exapprovedforhazardousareas• Optionalantennaheatingsystems• Wizarddrivensetup

APPLICATION NOTE

Contact

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Application 291 EN 2.indd 2 19.11.2010 10:44:11 Uhr

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