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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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45/67

.89:24;<

200/7/2=1

>2?=<@364ABCD29

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