Global flow measurement consistency
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Making measurements during calibration around the world equal.
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Global flow measurement consistency
- 1. Global Flow Measurement Calibration Consistency Erik Smits – VSL, Manager Metrology Services / Senior Metrologist Liquid Flow & Volume Dean Standiford – Emerson, Global Calibration Quality First presented at: Emerson Global Users Exchange 2018, Den Haag (NL)
- 2. Driving to the airport on Friday 2
- 3. What happened Friday? 3 What happened? What did I forget? • I doubted the amount of fuel I received and with that I expected that I paid to much this time, • I tried to compare fuel dispenser number 2 with number 4 with as reference the indicators in my car, • There is a tolerance for the fuel dispenser of +/- 0.5%. Was this difference within the tolerance? • My car is not a calibrated reference volume and the indicators in my car might have large tolerances! The question is: How can we compare measurements?
- 4. VSL – National Metrology Institute (NMI) of the Netherlands 4 Time and frequency ElectricityTemperature and humidity Length Gas flow Viscosity OpticsChemistry Mass Ionising radiation PressureLiquid flow and volume
- 5. Do we need accurate measurement in flow applications? • Just inventory measurement within a company (based on volume or flow), • Between two companies and maybe a large distance (flow based), • Between two countries and maybe even two or more companies, • Legal metrology organization in one country and maybe a commercial company in the other. You can be sure that there are differences in measurements. How much would you allow? 5 A B 500 km Country A to B
- 6. What do we need for good measurements? 6 Measurements need to be Comparable and Reliable and this can be done through: • A solid measurement system (good definitions) SI units (USC units) – 7 base units in SI: m, kg, s, A, K, mol, cd All flow measurements units traceable to one or more base units (m3/s, kg/s, m/s, kg/m3 mm2/s, kg, m3, mol, etc), • Unbroken chain of calibration and comparisons to (inter)national measurement standards, • Specified measurement uncertainties, • Instruments that show repeatable and reproduceable measurements results. Instruments that can cope with changing conditions.
- 7. Instrument calibration 7 Who performs calibration At what moment • National Metrology Institute, • Notified body or other legal authority, • Accredited calibration laboratory, • Non accredited calibration laboratory, • Manufacturer, • Owner, • Service provider, • Others… • Initial calibration after the instrument is manufactured to characterize the instrument for the intended use, • Legalization so it can be used in trade, • During use. For example during loading crude the flow meter is proved and adjusted if needed, • Annual due to contracts etc, • When drifts are identified, • Many, many other occasions.
- 8. How is measurement organized in the world? 8 • BIPM > National Metrology Institutes like VSL • OIML > for example NoBo’s like NMi-Certin • ILAC > accreditation organizations like UKAS • ISO > publishing authority for standards like ISO/IEC17043:2010 Proficiency Testing
- 9. How can we compare calibration results? 9 By means of comparisons Who organizes comparisons • Between National Metrology Institutes and Designated Institutes – Primary level (realization of the SI units) for example time standard – Secondary levels like in flow measurement • Between National Metrology Institutes and commercial accredited and non-accredited laboratories, service providers etc.., • Between commercial organizations. • BIPM for NMI’s and DI’s (One NMi or DI takes the lead), • Regional Metrology Organizations for it’s member and from time to time other NMI’s and DI’s (One NMi or DI takes the lead), • Proficiency Testing organization for customers. This can be accredited or non- accredited. • VSL has an accredited services and organizes comparisons commercially but also for BIPM and Euramet (RMO of Europe)
- 10. Comparisons between National Metrology Institutes 10 BIPM Level for flow CCM-WGFF Regional Metrology Organizations like Euramet Key-Comparisons for: • K1 – Water Flow • K2 – Hydrocarbon Flow • K3 – Air Speed • K4 – Liquid Volume • K5 – High Pressure Gas Flow • K6 – Low Pressure Volume Flow • Regional round of the Key-Comparisons • Bilateral comparisons • All kind of other comparisons Including test runs for Key-Comparisons (R&D)
- 11. Key-Comparison CCM.FF-K2.2011 (1) 11 • Hydrocarbon (K2) and Water (K1) flows between 10 and 60 kg/min, • Free of disturbances from the different pipe configuration at the participants, • No need for the participant to change the position of meter 1 and 2 upstream or downstream of each other, • Zero influence in results as small as possible, • Etc… @ NMI-J
- 12. Key-Comparison CCM.FF-K2.2011 (2) 12 Participants Some facts • VSL, Netherlands (Pilot Erik Smits), • TUV NEL, UK, • PTB, Germany, • BEV, Austria, • NIST, USA, • NMI-J, Japan • Kriss, South Korea, • CMS, Chinese Taipei, • MC, Canada > Euramet project • All participants tested with one or more hydrocarbons, • 5 participants tested also with water, • VSL tested 3 times at start, after European tour and at the end to check the stability of the system, • Shocks caused by transport were monitored and stored, • Transport cost for small flow meters in relative large skid +/- 40 kE, • Total cost of such a project …….
- 13. On the road 13 Temperature of skid G-forces
- 14. Results Key-Comparison CCM.FF-K2.2011 for water 14 Clarifications • The graph is not final yet until WGFF has approved. No changes to be expected, • Only one meter presented. Upstream and downstream results are combined for readability of Key-Comparison report, • In the graphs only 30, 40 and 50 kg/min are presented other results are of the same magnitude, • Hydrocarbon results are still under review. These results are not final yet. This as the final report has not been published officially on the BIPM key-comparison database website!
- 15. Emerson Calibration Facilities 15 • Flow measurement devices need calibrated to ensure the measurements are accurate and traceable to the International System of Units (SI) • Flow meters are produced and calibrated all over the world • Accuracy of a flow meter should not depend on where it is calibrated Boulder, USA Abu Dhabi, UAE Nanjing, China Sorocaba, Brazil Singapore Ede, Netherlands Melbourne, Australia Cluj, Romania Chihuahua, Mexico
- 16. Emerson Traceability 16 • Standard calibration programs provide vertical traceability • PT programs provide horizontal traceability National Mass Standard NIST-USA Reference Mass Standard (Emerson or contract service maintained) Emerson MMI Boulder, USA Gravimetric Stand Scales Micro Motion Inc. Boulder, USA Traceability & Uncertainty ISO 17025-NVLAP LAB Code: 200918-0 International Mass Standard National Mass Standard VSL-The Netherlands Reference Mass Standard (Emerson or contract service maintained) EPM Flow BV Ede, NL Gravimetric Stand Scales EPM Flow BV Ede, NL Traceability & Uncertainty ISO 17025-RvA RvA K 153 Certified-VSL LF.2007.06.0005 National Mass Standard NIM-China Reference Mass Standard (Emerson or contract service maintained) EPM Flow Technologies Co. Ltd. Nanjing, China Gravimetric Stand Scales EPM Flow Technologies Co. Ltd. Nanjing, China Traceability & Uncertainty ISO 17025-SAC Cert No: LA-2010-0469-C CMC Certified-NIM Traveling Measurement Standard Micro Motion Global Reference Meters Emerson MMI Boulder, USA TSM Stand Reference Meters EPM Flow Technologies Co. Ltd. Nanjing, China TSM Stand Reference Meters Working Measurement Standard Micro Motion Gravimetric Primary Flow Stands National Mass Standard NIM-Romania Reference Mass Standard (Emerson or contract service maintained) EPM Flow Technology Center S.R.L. Cluj-Napoca, Romania Gravimetric Stand Scales EPM Flow Technology Center S.R.L. Cluj-Napoca, Romania Traceability & Uncertainty ISO 17025-RENAR Cert No: IN PROCESS EPM Flow Technology Center S.R.L. Cluj-Napoca, Romania TSM Stand Reference Meters EPM Tecnologias de Flujo Chihuahua, Mexico TSM Stand Reference Meters EPM Tecnologias de Flujo Chihuahua, Mexico Traceability & Uncertainty ISO 17025-ema LAB Code: FL-28, DEN-23 EPM Tecnologias de Flujo Chihuahua, Mexico Gravimetric Stand Scales National Mass Standard CENAM-Mexico Reference Mass Standard (Emerson or contract service maintained)
- 17. Comparisons Between Emerson Calibration Labs 17 USA Netherlands Romania MexicoChina Singapore Australia Previous Current •Netherlands •VSL •0.020% •China •NIM •0.050% •Mexico •CENAM •0.035% •USA •NIST •0.035%
- 18. Micro Motion Coriolis Transfer Standards • Use Coriolis flow meters to run four tests on two same size meters – Take-out / Put-back reproducibility – Hysteresis – Repeatability – Compare with local National Metrology Institute • Different size flow meter run each year to cover entire system flow range over the span of 5 years with external labs – Internal comparisons covering the entire flow range performed routinely as part of a measurement assurance program 18 3 repeats 3 repeats A 1 5% 100% 67% 25% 5% B 2 5% 25% 67% 100% 5% C 1 5% 25% 67% 100% 5% D 2 5% 100% 67% 25% 5% Test Meter Flow Rate Sequence Cardinal Rates (5 repeats)
- 19. VSL Independent Report of Results 19 VSL is ISO/IEC 17043 Accredited for Proficiency Testing
- 20. VSL Evaluation of Claimed Uncertainty (CMC) 20
- 21. Conclusions 21 • The results for water mass flow rate of Key- Comparison CCM.FF-K2.2011 meet all criteria’s set, • VSL results for water mass flow compare with four other NMI’s, DI’s and CMC is consistent with the Key Comparison Reference Values, • Results of VSL can be used in commercial comparisons under ISO/IEC17043 accreditation as reference values for others. Other water flow facilities can be linked to the KCRV. Note: CCM.FF-K2.2011 results are not final yet! • Emerson performs flow meter calibrations that are traceable to the International System of Units (SI). • Emerson utilizes VSL as an ISO/IEC 17043 accredited proficiency test provider to ensure the accuracy of the calibration does not depend on where it is calibrated. • Comparison results between the Emerson labs support the claimed uncertainty. Emerson customers can be confident in there flow measurement results!!
Editor's Notes
- Friday I drove from home to the airport and I noticed my fuel level was low. I went to the gas station where I always fill up the tank in the city of Dordrecht just south of Rotterdam. It was not busy yet and I drove up next to fuel dispenser number 2. I do not know why but normally I choose number 4 I guess in my mind I was already thinking about my presentation. I got out of my KIA and took the nozzle from the dispenser and I started filling. I noticed that it took some time for the dispenser to start indicating the amount of fuel flowing into the tank of my car. After about two minutes the fuel flow stopped and I looked at the amount of fuel put in my car. Hmm I though I never put this much in before and I am sure my indicator for low fuel in the car was not lower then normal. Wow I thought is this fuel dispenser over reading and as I am a Metrologist maybe the other dispenser I normally use is under reading? Have I always been lucky?
- First show what happened then let What did I forget show in animation and finally the question. Tell at this moment that it does not matter what we measure but it needs to be equal within the possibilities. For example from production of oil till the moment I filled my car the oil was distilled into fuel and measured a dozen times at least. At every measurement point specially if it transfers from owner huge losses can be introduced. In the presentation we focus we focus on flow measurement but it is the case for all instruments. I will show an example where we measure later.
- VSL in the National Metrology Institute of the Netherlands we make measurement results of companies, laboratories and organizations directly traceable to international measurement standards. R&D is performed for measurements that are not yet fully traceable to SI Units.
- Story: When we pump liquid from location A to B or in this case from storage tank A to B we might not be so interested in the absolute amount of liquid just an indication of what is in tank A and in B. When the liquid transfers from company A to B now the amount becomes important and both company A and B will measure in some cases and there could be a difference. At this moment we change to flow as tank gauging is most of the times not the most accurate way we can do this. If company A and B are in different countries there might even be a measurement at the border. It can also be that the legal metrology organizations now are much more involved and flow can be measured maybe even 4 times. It can even be that four different companies or organizations are involved at each different measurement point. This can results in differences that could be due to method, system, instruments etc… Are these within the set tolerances.
- Just to show how this is done.
- Just to give an idea. Maybe need to change this.