nel’s epat facility - tuv-sud.co.uk€¦ · –ctsp and cpsp both used –ctlp and cplp (ctpl)...
TRANSCRIPT
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NEL’s EPAT Facility –
Experiences,
Challenges and Future
Developments
Chris Mills, NEL
25 April 2018
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– INTRODUCTION
– EPAT FACILITY
– CHALLENGES
– EXPERIENCES
– FUTURE DEVELOPMENTS
Content
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Brief history
• 2011: NEL completed R&D with Coriolis meters for a number of O&G
operators at elevated temperatures.
• 2012: NEL formulated a Joint Industrial Project (JIP) exploring influence of T,
P, and viscosity.
• 2014: JIP completed and concluded that:
– calibration under conditions similar to the field required
– lack of traceable calibration facilities that can operate at elevated
temperature, pressure, and viscosity
• 2014 – 2016 NEL designed & built a new flow loop operating at Elevated P
and T (EPAT) & Fully accredited to UKAS
• 2016 - present: This presentation focus now on Experiences, Challenges
and Future Developments
Introduction
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Current regulations
• UK Oil & Gas Authority (OGA) Guidelines
Introduction
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The facility:
EPAT Facilities
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EPAT Facilities
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Specification:
Item Spec
Maximum Pressure: 100 bar g
Minimum Pressure: 4 bar g
Pressure Control: +/- 0.5 Bar
Maximum Temperature: 80 °C
Minimum Temperature: 20 °C
Temperature Control: +/- 0.5 °C
Maximum Flow: 100 l/s
Minimum Flow: 0.5 l/s
Fluid Density: 0.810 kg/l
Maximum Fluid Viscosity: 6 cP
Minimum Fluid Viscosity: 2 cP
Test Section Pipe Size: 1 – 10 inch OD
Test Section Pipe Length: 10 metres
Measurement Uncertainty: ± 0.08 (k=2)
EPAT Facilities
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EPAT Facilities
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Operation & calculations
• DUT calibrated against Turbine Master Meters
– Master Meters are proved at every flowrate, pressure and temperature
– Typical sequence – (Prove, 3 DUT Repeats, Prove)
• Calculations
– CTSp and CPSp both used
– CTLp and CPLp (CTPL) are not used
CPSpCTSpBPVCTPL
CTPLV
mmp
provemmp
EPAT Facilities
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Operation & calculations
• DUT calibrated against Turbine Master Meters
– Master Meters are proved at every flowrate, pressure and temperature
– Typical sequence – (Prove, 3 DUT Repeats, Prove)
• Calculations
– CTSp and CPSp both used
– CTLp and CPLp (CTPL) are not used
– API values are not robust for NEL test fluid
CPSpCTSpBPVVmmp
provemmp
CPSpCTSpBPVCTPL
CTPLV
mmp
provemmp
EPAT Facilities
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Prover calculations
– API values are not robust for NEL test fluid
Error may be up to 0.1 % up to 49 bar(a), undefined above, [Glen N., O&G FG,
Dec 16]
Challenges
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Density characterisation
– API values are not robust for NEL test fluid
– Requires fluid to be characterised at T&P
– Stable density is critical for facility uncertainty
– Water contamination was an issue
CPSpCTSpBPVVmmp
provemmp
Challenges
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Demonstrating equivalence
• Intra-comparison
– Compared EPAT system with NEL gravimetric for low pressure and temperature
– Achieved equivalence but only at low P&T conditions.
Challenges
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Demonstrating equivalence
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
0.0 2.5 5.0 7.5 10.0 12.5 15.0
%E
rr (R
ef.
Ma
ss
)
Ref. Total MFlow , kg/s
Temperature 20°C, Pressure 5 bar.g
Gravimetric Compact Prover
Challenges
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Demonstrating equivalence
• Inter-comparison
– Compared EPAT system with West Lab for high pressure
– Achieved equivalence with manufacturer supplied meter
– Additional customer supplied data allowed comparisons at T&P to be made
Challenges
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-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
0 10 20 30 40 50 60 70 80 90 100
%E
rr (R
ef.
Ma
ss
)
Ref. Total MFlow , Tonne/hr
Temperature 68°C, Pressure 14 bar.g
NEL West Lab
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
0 250 500 750 1000
%E
rr (R
ef.
Ma
ss
)
Ref. Total MFlow , kg/s
NEL 10 bar.g NEL 40 bar.g West Lab 10 bar.g West Lab 40 bar.g
Demonstrating equivalence
Challenges
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Demonstrating equivalence
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
0 10 20 30 40 50 60 70 80 90 100
%E
rr (R
ef.
Ma
ss
)
Ref. Total MFlow , Tonne/hr
Temperature 68°C, Pressure 14 bar.g
NEL West Lab
Challenges
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Customer data
• Calibrated large number of Coriolis meters
– All manufacturers
– Variety of sizes and models
Experiences
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-2.00
-1.75
-1.50
-1.25
-1.00
-0.75
-0.50
-0.25
0.00
0 50 100 150 200 250 300 350
%E
rr (R
ef.
Ma
ss
)
Ref. Mass Flow, T/hr
Kerosene 20degC 3cSt Gas Oil 20degC 8cSt Gas Oil 20degC 8cSt (R) EPAT 25degC 10bar.g
EPAT25degC 20bar.g EPAT 25degC 20bar.g R EPAT 25degC 40bar.g
Customer data
Experiences
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Customer data
-2.00
-1.75
-1.50
-1.25
-1.00
-0.75
-0.50
-0.25
0.00
0 5 10 15 20 25 30 35 40 45
%E
rr (R
ef.
Ma
ss
)
Ref. Pressure, bar.g
Kerosene 20degC 3cSt Gas Oil 20degC 8cSt Gas Oil 20degC 8cSt (R)
EPAT 25degC 10bar.g EPAT 25degC 20bar.g EPAT 25degC 40bar.g
Experiences
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Customer data
Linear Pressure Effect
Experiences
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Calibration procedure
1. Zero device at operating temperature and pressure
2. Calibrate device at operating temperature and pressure ‘as found’
3. Additional pressure compensation calibration at ± 10 bar.g to derive pressure
compensation
4. Can then perform an ‘as left’ calibration if required
Experiences
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EPAT Facility
– MeterVue is fully operational
– Excellent feedback with users from Europe, Middle East and South East
Asia in the past year
– Live uncertainties are calculated for the results
– DAQ system uses EPAT UB for all calculations and reporting
– History for revising facility uncertainty
– Pressure stability ± 0.5 bar.g up to 100 bar
– Increase / decrease temperature by 10°C in 15 minutes
– Increase / decrease pressure by 20 bar in 5 minutes.
Experiences
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EPAT Facility
– Meters can be zeroed at T&P but as T drops, P drops significantly.
– RTD on board Coriolis flowmeters measures tube temperature as opposed to
fluid temperature (response lag)
– If zeroing at elevated temperature, it is important to allow time for stabilising
– Zero value can change by end of calibration. Possibly due to expansion /
contraction of facility with T&P over time.
Experiences
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• DDAT
– Collating all calibrations (both master meters & customer)
– Enable master meter calibration curves to be used
– Use customer data to revise Coriolis ISO 10790
• Direct Proving
– Not UKAS at present but work is ongoing
– Reduced uncertainty
– Quicker calibration
• Online Density
– Installing a CDM that has been characterised at NEL
Future Developments