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Compressible Flow Through Coriolis Meters Thomas Kegel, …...– ISO 5167 compliant venturi ... •...
Transcript of Compressible Flow Through Coriolis Meters Thomas Kegel, …...– ISO 5167 compliant venturi ... •...
Compressible Flow Through
Coriolis Meters
Thomas Kegel, CEESI
Wednesday Morning
Surrogate Fluid Calibration
• Water vs gaseous hydrocarbon
• Air vs gaseous hydrocarbon
• Secondary effects
– Velocity
– Pressure
– Mach number
– Compressibility
Objectives
• Gain operational knowledge
• Improve calibration processes
• Share results with industry
• Precedents
– Ultrasonic
– ISO 5167 compliant venturi
– Critical flow venturi
– Turbine
Three “Part” Program
• Literature Survey
• Massed calibration results, 46 meters
• Detailed testing, 2 meters
Round 1:
• May 2011 – Jan. 2014
Round 2:
• Aug. 2012 – Nov. 2104
Size [in] Quantity
0.25 3
0.5 19
1.0 12
2.0 10
3.0 2
Massed Calibration Results (Round 1)
• Grouped based on curve shape
• Deviation vs. mass flowrate (%FS)
• High flow = Groups A, B, C and D
• Low flow = Groups E and F
Typical High Flow Data
Typical Low Flow Data
ROUND 1
• Seven calibrations
• Curve fits in black (average)
• 95% confidence interval in red
Round 1 Group A
• Six calibrations
• Curve fits in black (average)
• 95% confidence interval in red
Round 1 Group B
Round 1 Groups A and B
±0.16%
ROUND 2
Re-organize the groups
Current Group A
±0.16%
Current Group B
±0.16%
±0.30%
Current Group C
Current Group D
Current Group D
±0.16%
AGA 11 Requirements
Low Flowrate
AGA 11 Requirements
Round 1 Random Effects
AGA 11 Limits
Round 2 Random Effects
Part 2 Test Meter
Part 2 Test Meter
Limits From
Part 1
Drive Gain Diagnostic
Drive Gain Diagnostic
Conclusions (Part 1, High Flow)
• Mass flowrate above 3%FS
• Meters meet the requirements of AGA 11 (95% CL)
• Variation with velocity:
– Increase in error with velocity
– 36 meters fit within ±0.16%
– 6 meters fit within ±0.30%
– 4 meters do not follow the trend
Conclusions (Part 1, Low Flow)
• Mass flowrate below 3%FS
• Meters meet the requirements of AGA 11 (95% CL)
• Variation with velocity:
– Increase in random variation with decreasing
flowrate
– Indication of zero shift
Conclusions (Part 2)
• Observed variation with pressure
• Apparent correlation with velocity
• Some similarity to Part 1
• Interesting correlation with gain variation
Future Plans
• Increase Part 1 to 75 meters
• Add third Part 2 meter
• Integrate more diagnostics
• Transient behavior
Thank You For Your Time