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3/26/14
1
Comprehensive Survey of Coriolis Gas Calibration Results -
Phase 1
Introduction
Natural Gas Applications •! Surrogate fluid calibration
–! Water –! Air
•! Effect of compressibility? •! Second order meter effects
–! Differential producers –! Turbine meters –! Coriolis?
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Organization
•! Three part program •! Some published results •! Organized CEESI test activities •! Summary of calibration results •! Future plans
Three Part Program
1.! Literature search –! Theoretical models –! Test results –! Standards
2.! Structured CEESI test data –! Some data currently available –! More to come (Phase 2)
3.! Summarized calibration results –! Some data currently available –! More to come (Phase 2)
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Some Published Data
AGA 11
CEESI data
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AGA 11
Pass/Fail Criteria
Harmonic Oscillators
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Structured CEESI Testing - First Test Plan
•! Coriolis Flow Meter (CFM) installed upstream •! Critical Flow Venturi (CFV) installed downstream
Critical Flow Venturi (CFV)
•! Common laboratory gas flow standard •! Converging-diverging shape •! Maintain Mach = 1.0 within throat •! Nominally constant velocity through CFV and CFM •! Mass flowrate varies with:
–! Throat pressure –! Throat temperature –! Throat area
•! Throat conditions (P, T) calculated from measured inlet conditions and calibration data
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Critical Flow Venturi (CFV)
•! Directional sonic noise and turbulence source •! Can affect flowmeter calibration
–! Vortex meter –! Thermal dispersion meter –! Ultrasonic meter
•! Noise mostly propagates downstream •! Effect on coriolis meter?
Test Plan
•! Coriolis Flow Meter installed upstream •! Critical Flow Venturi installed downstream •! No intermediate valve •! “Constant velocity test”
–! Variable CFV inlet pressure –! Variable CFM flowing pressure –! Variable mass flowrate –! Constant volume flowrate, velocity
•! Repeat for several CFVs with different throat diameters
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Detailed Test Data
Detailed Test Data
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Potential Pressure Effect
Correlation of Dominant Trend
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Detailed Test Data
Venturi Calibration Results – Sometimes noted
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Venturi Calibration Results
Turbulent Throat Boundary Layer
Laminar Throat Boundary Layer
This is not a Reynolds number effect
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Summary of Calibration Results
Compressed Air Calibrations (363 total)
ISO 5167 Compliant Venturi
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Previously published results
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Summary of Calibration Results
Eleven Recent Calibrations •! Technical maturity •! Mostly half and one inch sizes, one two inch •! Note rangeability
Eleven Recent Calibrations
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Eleven Recent Calibrations
AGA 11
Pass/Fail Criteria
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Eleven Recent Calibrations
Eleven Recent Calibrations
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Eleven Recent Calibrations
AGA 11
Pass/Fail Criteria
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Repeatability
Non-Linearity
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Future Plans
Additional: 1.! Calibration data analysis 2.! Structured testing 3.! Literature review
•! Diagnostics •! Zero settings •! Pressure effect •! Line size effect •! Velocity limits
Thank you for your time