Traceability overview

Transcription

1 Traceability overview Weighing scale and traceable calibration weights from ISO17025 accredited supplier Pipe prover calibration by VSL (NMI Netherlands) Turbine master meter Ultrasonic master meters Small volume prover calibration by VSL (NMI Netherlands) Meter Under Test calibration by Cameron ISO17025 internal procedure

2 Uncertainty analysis example

3 Major contributors to uncertainty Prover base volume Coefficient of thermal expansion for the liquid Delta temperature between prover and meter under test Delta temperature for connecting volume

4 NVLAP Certified Uncertainties 10 to 750 m 3 /hr Small volume prover 0.03% Turbine master meter 0.04% 150 to 2200 m 3 /hr Ball prover 10 m % Ball prover 3.3 m % One master meter 0.09% 600 to 3900 m 3 /hr Two master meters 0.08%

5 Comparison of ISO17025 capabilities Cameron CUTC TUV NEL TRAPIL SPSE Uncertainty(%) ,000 1,500 2,000 2,500 3,000 3,500 4,000 Flow rate (m 3 /hr)

6 Key standards and documentation International Standards Organisation ISO17025:2005 General requirements for the competence of testing and calibration laboratories Joint Committee for Guides in Metrology JCGM 100:2008 (GUM 1995 with minor corrections) Evaluation of measurement data Guide to the expression of uncertainty in measurement API Manual of Petroleum Measurement Standards Especially the subchapters of Chapter 4 - Proving Selected ISO and ASTM standards

7 Calibration laboratory management system Independent quality system accredited for conformance with ISO17025 Calibration laboratory quality manual comprising 28 documents Plus 26 documented operational procedures

8 Master meter long term stability Master meters are calibrated before use Long term stability gives a good indication that everything is working as expected

9 Master meter long term stability Time Vs MF bar For 10 inch 280C MM1 for the following Re 10,000 56, , ,341 1,000, MF bar /1/2007 3/19/ /5/2008 4/23/ /9/2009 5/28/ /14/2010 7/2/2011 1/18/2012 Date

10 Temperature control Temperature ( C) SPSE Trapil Cameron - 35 deg C set point Cameron - 20 deg C set point TUV NEL - 20 deg C set point Time (minutes)

11 Intercomparison with NEL (UK) ISO states that Participation in a suitable programme of interlaboratory comparisons is required where possible Flow intercomparisions involving multiple laboratories are rare and tend to involve national measurement institutes However, NEL in the UK had been designated at pilot lab in the recently completed Liquid Hydrocarbon Flow Key Comparison CCM-FF-K2, carried out under the auspices of the International Committee of Weights and Measures (CIPM)

12 Intercomparison with NEL (UK) Other participants in CCM-FF-K2 were: CMS (Chinese Taipei), NMIJ (Japan), NMi VSL (Netherlands), FORCE (Denmark), and SP (Sweden) Therefore by carrying out a bi-lateral intercomparision with NEL, a successful result would demonstrate metrological equivalence with a broad group of national metrology institutes

13 Key Comparison CCM-FF-K2 results

14 Intercomparision package An intercomparision package was assembled using two 6-inch Caldon 8-path meters A flow conditioning upstream section was used to ensure absolutely minimal installation effects Flow A B C D E F G A and G B C D & F E 5D straight length (matched schedule with internal welds ground flush) Perforated plate flow conditioner (CPA) 15D straight length (matched schedule with internal welds ground flush) 280Ci ultrasonic flow meters 3D 150# to 300# flange adaptor spool

15 Intercomparision package Cameron NEL, UK

16 Intercomparision package Primary comparison was carried out using kerosene substitute (Exxsol D80) over a flow range of 100 to 600 m 3 /hr in both facilities Cameron lab tests vs ball prover NEL tests versus turbine secondary standards A secondary comparison was also carried out using the NEL water flow facility gravimetric standard Comparisons were made at overlapping Reynolds numbers

17 Intercomparision results on kerosene 0.15% 0.10% Meter 1 Meter 2 Combined uncertainty acceptance limits 0.05% Difference (%) 0.00% -0.05% -0.10% -0.15% Log Reynolds number

18 Intercomparision results vs water 0.15% 0.10% 0.05% NEL oil data compared to Cameron oil calibration NEL Water data compared to Cameron oil calibration Combined uncertainty acceptance limits Difference (%) 0.00% -0.05% -0.10% -0.15% Log Reynolds number

19 Intercomparision results The results from both meters and both NEL facilities (oil and water) demonstrated metrological equivalence with the Cameron laboratory The closest and most linear agreement was actually found in the case of the water comparison, suggesting that the difference in the oil calibration were in part due to the curve fitting to the NEL secondary standard turbines

20 SUMMARY The Cameron laboratory as constructed exceeds the design expectations It offers a capability that surpasses that of the third-party facilities previously used The uncertainty has been validated by VSL, NVLAP and the NEL intercomparision Use of well understood and reliable system components and methods have resulted in a high availability the laboratory is in almost constant use

21 Thank you