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1 Calibration of Prover Tanks using a Coriolis Mass Flow Meter as the Master Meter. Is this possible for Pipe Prover calibration too? Erik Smits (fsmits@vsl.nl) 2 nd European Flow Measurement Workshop Sintra, Portugal, March 26 th 2014 NEW VSL Conditioning plate! -! It is not based on Reynolds! -! Is based on the Golden Ratio! -! Will be named after the inventors: The van der Beek / Smits plate or VDBSP -! Is beyond all doubt! -! You all have at least one with you today! -! And you are already looking at the design Are you ready to see it!!!!.. 1

2 NEW VSL Conditioning plate! -! It is not based on Reynolds! -! Is based on the Golden Ratio! -! Will be named after the inventors: The van der Beek / Smits plate or VDBSP -! Is beyond all doubt! -! You all have at least one with you today! -! And you are already looking at the design Are you ready to see it!!!!.. Contents -! Why this presentation? -! The use of Proving Tanks and Pipe Provers -! Requirements for measurement uncertainty in legal metrology (OIML and NIST - API publications) -! Methods of calibration -! Master Meter method -! Why use a Coriolis mass flow meter and not a traditional flow meter as the master meter? -! Conclusion and discussion -! Recommendation 2

3 Why this presentation? -! VSL publication about Master Meter method for Proving Tanks in International Journal of Metrology and Quality Engineering volume 3. -! Use of Proving Tanks around the world is still important for testing liquid flow meters -! Show that Coriolis mass flow meters are for this type of work (the best) Master Meters -! Pipe Provers in the field can be calibrated using the Master Meter method -!!!..I hope it starts a discussion! Metering system (1) 3

4 Metering system (2) OIML R119 Usage of Proving Tanks and Provers -! Legal metrology (Notified bodies) - custody transfer fiscal metering [OIML -API] -! Type approval of flow meters (mostly in laboratory) -! Verification of flow meters (in field and laboratory) -! Proving of flow meters (only in field) Uncertainty depending on class and test -! Calibration laboratories (NMI s, ISO/ IEC17025, service companies etc..) -! Calibration of flow meters (U between 0.02 and 0.1%) -! Calibration of other Proving Tanks (U <0.02%) -! Calibration of Pipe Provers (U <0.02%) 4

5 Requirements in OIML publications(1) -! OIML R (1996 edition) PP OIML R (2010 edition) PT Expanded uncertainty on calibration volume be within one-fifth of the maximum permissible error on pattern approval tests and one-third of the maximum permissible error on verification tests -! OIML R Accuracy classes (2007 edition)!"#$$ %&' %&( )&% )&( * %&'+ %&(+ )&%+ )&(+, %&-+ %&'+ %&.+ )&%+ Remark: MPE is for the measurement system not just the flow meter! Requirements in OIML publications(2) -! Calculating the uncertainty according class and type of test leads to:!"#$$ %&' %&( )&% )&( * %&'+ %&(+ )&%+ )&(+ ),( %&%-+ %&)%+ %&.%+ %&'%+ ),' %&)%+ %&)-+ %&'/+ %&(%+!"#$$ %&' %&( )&% )&( * %&+, %&', %&-, )&%, ).(!"!#$ %&%-, %&)+, %&+%, ).' %&%-, %&)%, %&+%, %&'/, -! OIML R For standard test measures and Proving Tanks, the maximum permissible errors shall be ± 1/2000 of the nominal capacity. Resulting in U max = 0.05%? 5

6 Requirements NIST Handbooks - API MPMS -! Chapter 4.7 Field Standard Test Measures and Chapter Introduction to the Determination of the Volume of displacement and Tank Provers both points to NIST Handbook 44 and 105 -! Proving Tanks NIST Handbook Accuracy 0.05% (in harmonization with OIML R120) -! Pipe Provers NIST Handbook Accuracy 1/3 of accuracy in handbook 44 leads to 0.05% or larger Methods of calibration Proving Tank Volume calibration (best achievable uncertainty) -! Gravimetric method U>0.005% VSL 0.01% -! Volumetric transfer method U>0.015% VSL 0.02% -! Master Meter method U>0.030% VSL 0.03% Uncertainties estimated depending on NMI or other laboratories and volume. VSL uncertainties are approved by all other NMI through the CIPM MRA! 6

7 F F 3/26/14 Methods of calibration Pipe Prover Volume calibration (best achievable uncertainty) -! Gravimetric method U>0.010% VSL 0.01% -! Volumetric transfer method U>0.020% VSL 0.02% -! Master Meter method U>0.030% VSL 0.03% -! Diameter and length U? VSL 0.005% Uncertainties estimated depending on NMI or other laboratories and volume. VSL uncertainties are approved by all other NMI through the CIPM MRA! VSL is the only NMI in the world with a CIPM MRA logo on certificates for Pipe Provers. Master Meter method for Proving Tank -! 3 or more runs to establish the Meter Factor (MF start ) -! 5 or more calibration runs to establishing the volume of Proving Tank. P T RH -! 3 or more runs to establish the Meter Factor. (MF stop ) -! Calculate the volume of the Proving Tank by using the average Meter Factor -! Check if everything stayed within the set limited (according to API or your own procedures). 0.02% between average MF start and MF stop, etc! T P P P T T T kg 7

8 Master Meter method for Pipe Prover In this example a master Pipe Prover. You can replace this with a Proving Tank. Proving Tank calibration using Master Meter method (1) Outside VSL calibration facilities for liquid flow, Dordrecht, The Netherlands 8

9 Proving Tank calibration using Master Meter method (2) VSL calibration facilities for liquid flow, Dordrecht, The Netherlands Pipe Prover calibration using Master Meter method IKS-SKID used for BIPM Key-comparrison CCM.FF-K VSL calibration facilities for liquid flow, Dordrecht, The Netherlands 9

10 Pipe Prover calibration using Master Meter method Caldon, Pittsburgh, USA Why would we use a Coriolis mass flow meter and not traditional flow meter?(1) Process: What did we expect! -! Liquid temperature would not dominate the measurements any longer -! Small changes in flow rate do not affect the measurements -! Flow meter curve during ramp up and down have smaller influence on the measurement (PT only) -! Launch of piston not affecting the measurement -! Less measurement parameter in the equations 10

11 Why would we use a Coriolis mass flow meter and not traditional flow meter?(2) Flow Meter What did we expect! -! No large improvement in repeatability of the measurements -! Improved stability in Meter Factor between start and stop measurements -! Zero cut off should not be of any influence on the measurements -! No difference expected between mass and volume reading of the Coriolis mass flow meter Data from a calibration of a 1500 L Proving Tank at VSL Start measurements!"# $%&' (($ )($ *++, *-. /0 1#, [--] *++,! "# $"%& '()*' 0, *))),(! "# $"%' '()*+ 0, *)))-)! "# $"%. '(-*( 0, *))),'! "# $"%( '(,*+ 0, *))),/! "# $"%0 '(/*- 0, *)))/' *++, 0, , #:65:7:43;7(46#7*<, 0,0019 0,0022!7(6= +(1#7*<, 0,0105 0,0125 Stop measurements!"# $%&' (($ )($ *++, *-. /0 1#, [--] *++,! "#$%& '()*+ 0, *,,,)+! "#$%' '(-*+ 0, *,,,)&! "#$%- '((*) 0, *,,,).! "#$%. '((*( 0, *,,,)/! "#$%( '(.*( 0, *,,,) *++, 0, , #:65:7:43;7(46#7*<, 0,0020 0,0016!7(6= +(1#7*<, 0,0106 0,0085! between Start and Stop!!"#!$%&'!( )*%)!%+,!-./ 0,0001 0, )*,1*%1!1234!"2*,!*55!-./ 0,0013 0,0013 Volume measurements!"# $%&' ( )*+,-. /012 ( )*+,-. /0( #4 [litre] [litre]!"#$% &'()* 1499,94 %+,,),+!"#$& &'()* 1499,71 %+,,)-%!"#$. &'()+ 1499,71 %+,,)-*!"#$+ &'()* 1499,94 %+,,),.!"#$' &'()* 1499,87 %+,,)/-!"#$( &'()& 1499,92 %+,,),&!"#$- &'()& 1499,79 %+,,)-,!"#$/ &'-)* 1499,85 %+,,)/(!"#$, &'')- 1499,83 %+,,)/.!"#$%* &'()+ 1499,83 %+,,)/. :;-,<6-/ , ,84 = *<#><,>/>-;?/1-<#/3@4 0,0018 0,0018!/1<A +19#/3@4 0,0159 0,0161 Repeatability of the measurements: Looks a bit better but not significant! No difference expected between mass and volume reading of the Coriolis mass flow meter: True! Difference in volume to previous calibrations <0,01% and random 11

12 Data from a calibration of 60 L volume of a 18 Daniel Compact Prover (VSL) Start measurements!"# $%&' (($ )**+ ),-./0#1 )**1!"#$"%& '()* *)+++,-!"#$"%. '()& *)++++/!"#$"%0 '()* *)+++,+!"#$"%' '')+ *)+++,-!"#$"%( '()* *) )**1 *)++++& 896#:65:7:430690&#7(46#7);1 *)**(.! (6<*(0#7);1 *)*&*, Stop measurements!"# $%&' (($ )**+ ),-./0#1 )**1!"#$%& ''() *(++++*!"#$%, ''(- *(++++.!"#$%/ ''() *(++++&!"#$%' ''() &(****0!"#$%. ''(+ *( )**1 *( #:65:7:430690&#7(46#7);1 *(**0/! (6<*(0#7);1 *(*&.,! between Start and Stop!!!"#$%&'#()*%)#%+,!"!!#! -)*,.*%.#./01*)1&,#!/*,#*22#345!"!!$% Volume measurements!"# $%&' ()**+,--.,/0123#4,54!"#$% &&'( ()')*+,!"#$- &&'. ()')*),!"#$. &&'& ()')*(,!"#$& &&'( ()')*)(!"#$( &&'( ()')*/,!"#$, &&'- ()')*/+!"#$+ &&'( ()')*)(!"#$/ &&'& ()')*(+!"#$) &&'( ()')*/(!"#$%* &&'. ()')*)- 678*908:,--4 ()')*/. ;+9#<9*<:<8739+3&#:=89#:,>4 *'**-(! =9?-=3#:,>4 *'**,+ Repeatability of the measurements: Looks a bit better but not significant! Volume difference with gravimetric method <0,005% tested at different flow rates. Prover also has a 120 and 30 L volume was not tested Simplified Equation Only second step shown for a small volume Prover (compact prover) here when Master Meter has been calibrated When Coriolis meter needs to be corrected for pressure it needs to be added! 12

13 Liquid Temperature 34,468 Oval gear flow meter change between start and stop 34,466 34,464 34,462 34,460 k-factor [p/l] 34,458 34,456 34,454 0,02% 34,452 34,450 34,448 34,446 19,2 19,3 19,4 19,5 19,6 19,7 19,8 19,9 20,0 20,1 20,2 20,3 20,4 20,5 20,6 20,7 20,8 20,9 21,0 21,1 Temperature [ C] Liquid temperature would not dominate the measurements any longer: True Improved stability in Meter Factor between start and stop measurements: True!!"#!$%&'!( )*%)!%+,!-./ 0,0001 0, )*,1*%1!1234!"2*,!*55!-./ 0,0013 0,0013!!!"#$%&'#()*%)#%+,!"!!#! -)*,.*%.#./01*)1&,#!/*,#*22#345!"!!$% Flow changes during calibration (1) Calibration Coriolis meter 60 days before L calibration L calibration 2500 L calibration Flow rate [kg/min] Meter Factor [--] % 4000 L calibration Calibration PD meter Time [s] Flow rate [kg/min] / [L/min] Small changes in flow rate do not affect the measurements : True Flow meter curve during ramp up and down have smaller influence on the measurement : True Zero cut off should not be of any influence on the measurements: True if setup correctly! 13

14 Flow changes during calibration (2) Flow Time [s] Why would we use a Coriolis mass flow meter and not traditional flow meter?(1) Process: What do we expect! -! Liquid temperature would not dominate the measurements any longer -! Small changes in flow rate do not affect the measurements -! Flow meter curve during ramp up and down have smaller influence on the measurement (PT only) -! Launch of piston not affecting the measurement -! Less measurement parameter in the equations 14

15 Why would we use a Coriolis mass flow meter and not traditional flow meter?(2) Flow meter What do we expect! -! No large improvement in repeatability of the measurements -! Improved stability in Meter Factor between start and stop measurements -! Zero cut off should not be of any influence on the measurements -! No difference expected between mass and volume reading of the Coriolis mass flow meter Conclusion and discussion (1) -! Using a Coriolis mass flow meter as the Master Meter works -! A better uncertainty can be achieved. 0.03% is possible -! Uncertainty for Master Meter method well within legal metrology specifications -! Long term stability data showed that all four Proving Tanks did not show a shift for the new Master Meter. Everything is random in time 15

16 Conclusion and discussion (2) -! For a Coriolis mass flow meter in a fixed facility it might not be needed to establish the meter factor before and after the determination of the volume. Limitation need to be set. -! Other liquids than water can be used for this method and what are the limits! Recommendation Only use Coriolis mass flow meters if you know how they work and how to set them up! If this knowledge is not available (big) mistakes can be made! If the knowledge is available we recommend Coriolis mass flow meters for this method for calibration of Proving Tanks and Pipe Provers! 16

17 VSL PO Box AR Delft The Netherlands T F E info@vsl.nl I Erik Smits E fsmits@vsl.nl! Questions? Erik Smits: VSL group: VSL Fluid Flow Metrology group: 17

Calibration, traceability, uncertainty and comparing measurement results. Workshop 16 March 2015 VSL, Delft The Netherlands

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