compressible flow through coriolis meters thomas kegel, …...– iso 5167 compliant venturi ... •...
TRANSCRIPT
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