Scope

© 2019 Dynamic Flow Computers. All rights reserved.

www.dynamicflowcomputers.com

TECHNICAL BULLETIN

TURBINE DIAGNOSTIC

Page 1 of 2

DFC-TB-1904

Built-inTurbineDiagnosticIntelligenceforBetterMeasurement

• Missing/ExtraPulses• Non-conformingTurbineMeter• Turbinewobbling• Pulsationorswirltypeflowcondition• Turbinebearingproblem• Fluidcavitation• Automaticperformancezones

configuration

TurbineDiagnosticfeatureappliestoDynamicFlowComputersModelsMicroMS4, SFC 332L & SFC 332P withTurbineLiquidandGasFlowMeteringSystems.

AbstractBack in 1952 API (TheAPI Manual of PetroleumMeasurement Standards) came up with a methodology topredictturbinemetersorpreampfailuresbyinstallingdualpickupcoils90degreesoutofphase.Theintentionwastodeterminewhenaturbinebladeismissingorapulseismissedononepickupbutnottheother,wherelevelBpulsefidelitywouldalarmformissingpulses.

DynamicFlowComputersintelligentflowdiagnosticsgoesbeyondsimplemissingbladesorpulsesbutextendsit toactual turbinemeterperformanceevaluationandsetting itupagainst stored initialperformancehistorywhen the flow computer was first installed. Dynamic Flow Computer uses a 2 Mhz clock for precisedeterminationofrisingtimeandfalltimeforeachbladeandeachtimethatbladereturns.Conditionsaffectingrepeatabilityandmeter factoraredetectedandalarmed forearlyonbeforebecomingamajor issue.HavingThis technology is crucial for peace ofmindwhen it comes to turbinemeters or similar rotating typemetertechnology.

AutomaticPerformanceZonesConfigurationDifferentperformancezonesareautomaticallyconfiguredtobetteraccommodatethe irregularityof rotatingtypemetersatdifferentflowrates

RelatedDocumentation:• Micro MS4 / Micro 100 Gas Operator Manual (4 Gas/Crude Meters)• SFC332L Liquid (2 Meters) Operator Manual• SFC332P Prover Operator Manual

© 2019 Dynamic Flow Computers. All rights reserved.

www.dynamicflowcomputers.com

TECHNICAL BULLETIN

TURBINE DIAGNOSTIC

Page 2 of 2

DFC-TB-1904

ExampleofTurbineDiagnosticModbusAddressTable

Wiring&InstallationIt is assumed that theuserbeginswithandmaintainsaperfectnoise free installation.Theusermustensurethateachpulsetraininputtotheflowcomputerisaclean,lowimpedancesignalwhichwillnotbesubjecttoextraneousnoiseorelectromagnetictransients.

AlarmsandDisplaysAtotalfailureofeitherpulsetrainandotherturbineperformanceeventwillbedetectedwitha100%certainty.TheflowcomputerwillalarmthisconditionandcontinuetotalizingwiththeremainingpulsetrainasrecommendedinAPIMPMS(Chapter5,Section5).

Any regular occurrence of thesetypes of events must cause theequipment and/or wiring to besuspect and investigated. Pulsesecurity check circuitry is notintended to facilitate continuedoperation with a poor wiringinstallation which is prone toelectricalnoiseortransients.

Example of Turbine Meter WiringModel Micro MS4

Where dual pulse security fails DFC flow measurement diagnostics predicts measurement errors in all rotary type meters.