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3/26/14
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 ([email protected]) 2nd European Flow Measurement Workshop Sintra, Portugal, March 26th 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!!!!..
3/26/14
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
3/26/14
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)
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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%)
3/26/14
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Requirements in OIML publications(1)
-! OIML R119 – 2.2 (1996 edition) PP OIML R120 - 2.2.1 (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 R117-1 - Accuracy classes (2007 edition)
!"#$$ %&' %&( )&% )&(* %&'+ %&(+ )&%+ )&(+, %&-+ %&'+ %&.+ )&%+
Remark: MPE is for the measurement system not just the flow meter!
Requirements in OIML publications(2)
-! Calculating the uncertainty according class and type of test leads to:
-! OIML R120 - 2.2.2.2 For standard test measures and Proving Tanks, the maximum permissible errors shall be ± 1/2000 of the nominal capacity. Resulting in Umax = 0.05%?
!"#$$ %&' %&( )&% )&(* %&'+ %&(+ )&%+ )&(+),( %&%-+ %&)%+ %&.%+ %&'%+),' %&)%+ %&)-+ %&'/+ %&(%+
!"#$$ %&' %&( )&% )&(* %&+, %&', %&-, )&%,).( !"!#$ %&%-, %&)+, %&+%,).' %&%-, %&)%, %&+%, %&'/,
3/26/14
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Requirements NIST Handbooks - API MPMS
-! Chapter 4.7 “Field Standard Test Measures” and Chapter 4.9.1 “Introduction to the Determination of the Volume of displacement and Tank Provers” both points to NIST Handbook 44 and 105
-! Proving Tanks NIST Handbook 105-3 Accuracy 0.05% (in harmonization with OIML R120)
-! Pipe Provers NIST Handbook 105-7 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!
3/26/14
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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 (MFstart)
-! 5 or more calibration runs to establishing the volume of Proving Tank.
-! 3 or more runs to establish the Meter Factor. (MFstop)
-! 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 MFstart and MFstop, etc!
2498.95 kgFF
P T
P T
P T
P
T
RH
T
3/26/14
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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
3/26/14
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Proving Tank calibration using Master Meter method (2)
VSL calibration facilities for liquid flow, Dordrecht, The Netherlands
Pipe Prover calibration using Master Meter method
VSL calibration facilities for liquid flow, Dordrecht, The Netherlands
IKS-SKID used for BIPM Key-comparrison CCM.FF-K2.1.2011
3/26/14
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
3/26/14
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
!"# $%&' (($ )($
*++, *-./01#, [--] *++,
! "#$"%& '()*' 0,99959 +*))),(
! "#$"%' '()*+ 0,99953 +*)))-)
! "#$"%. '(-*( 0,99955 +*))),'
! "#$"%( '(,*+ 0,99961 +*))),/
! "#$"%0 '(/*- 0,99964 +*)))/'
23456.47*++, 0,99958 0,99975
8 96#:65:7:43;7(46#7*<, 0,0019 0,0022!!7(6= +(1#7*<, 0,0105 0,0125
!"# $%&' (($ )($
*++, *-./01#, [--] *++,
! "#$%& '()*+ 0,99953 +*,,,)+
! "#$%' '(-*+ 0,99955 +*,,,)&
! "#$%- '((*) 0,99959 +*,,,).
! "#$%. '((*( 0,99964 +*,,,)/
! "#$%( '(.*( 0,99962 +*,,,)0
23456.47*++, 0,99959 0,99974
8 96#:65:7:43;7(46#7*<, 0,0020 0,0016!!7(6= +(1#7*<, 0,0106 0,0085
!!!"#!$%&'!( )*%)!%+,!-./ 0,0001 0,0013
0 )*,1*%1!1234!"2*,!*55!-./ 0,0013 0,0013
!"# $%&' ()*+,-./012 ()*+,-./0(2
3++4 356789#4 [litre] [litre]
!"#$% &'()* 1499,94 %+,,),+
!"#$& &'()* 1499,71 %+,,)-%
!"#$. &'()+ 1499,71 %+,,)-*
!"#$+ &'()* 1499,94 %+,,),.
!"#$' &'()* 1499,87 %+,,)/-
!"#$( &'()& 1499,92 %+,,),&
!"#$- &'()& 1499,79 %+,,)-,
!"#$/ &'-)* 1499,85 %+,,)/(
!"#$, &'')- 1499,83 %+,,)/.
!"#$%* &'()+ 1499,83 %+,,)/.
:;-,<6-/3++4 1499,84 1499,84
= *<#><,>/>-;?/1-<#/3@4 0,0018 0,0018!!/1<A +19#/3@4 0,0159 0,0161
Start measurements Volume measurements
Stop measurements
! between Start and Stop
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
3/26/14
12
Data from a calibration of 60 L volume of a 18” Daniel Compact Prover (VSL)
Start measurements Volume measurements
Stop measurements
! between Start and Stop
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
!"# $%&' (($
)**+ ),-./0#1 )**1
!"#$"%& '()* *)+++,-
!"#$"%. '()& *)++++/
!"#$"%0 '()* *)+++,+
!"#$"%' '')+ *)+++,-
!"#$"%( '()* *)++++-
23456-47)**1 *)++++&
896#:65:7:430690(46#7);1 *)**(.!! (6<*(0#7);1 *)*&*,
!"# $%&' ()**+
,--. ,/0123#4 ,54
!"# $% &&'( ()')*+,
!"# $- &&'. ()')*),
!"# $. &&'& ()')*(,
!"# $& &&'( ()')*)(
!"# $( &&'( ()')*/,
!"# $, &&'- ()')*/+
!"# $+ &&'( ()')*)(
!"# $/ &&'& ()')*(+
!"# $) &&'( ()')*/(
!"# $%* &&'. ()')*)-
678*908:,--4 ()')*/.
;+9#<9*<:<8739+3&#:=89#:,>4 *'**-(!! =9?-=3#:,>4 *'**,+
!"# $%&' (($
)**+ ),-./0#1 )**1
!"#$%& ''() *(++++*
!"#$%, ''(- *(++++.
!"#$%/ ''() *(++++&
!"#$%' ''() &(****0
!"#$%. ''(+ *(+++++
23456-47)**1 *(++++0
896#:65:7:430690(46#7);1 *(**0/!! (6<*(0#7);1 *(*&.,
!! !!"#$%&'#()*%)#%+, !"!!#!
-)*,.*%.#./01*)1&,#!/*,#*22#345 !"!!$%
Simplified Equation
Only second step shown for a small volume Prover (compact prover) here when Master Meter has been calibrated When Coriolis meter needs to be corrected for pressure it needs to be added!
3/26/14
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34,446
34,448
34,450
34,452
34,454
34,456
34,458
34,460
34,462
34,464
34,466
34,468
19,2 19,3 19,4 19,5 19,6 19,7 19,8 19,9 20,0 20,1 20,2 20,3 20,4 20,5 20,6 20,7 20,8 20,9 21,0 21,1
k-fa
ctor
[p/L
]
Temperature [°C]
Oval gear flow meter change between start and stop
0,02%
!! !!"#$%&'#()*%)#%+, !"!!#!
-)*,.*%.#./01*)1&,#!/*,#*22#345 !"!!$%
!!!"#!$%&'!( )*%)!%+,!-./ 0,0001 0,0013
0 )*,1*%1!1234!"2*,!*55!-./ 0,0013 0,0013
Liquid temperature would not dominate the measurements any longer: True Improved stability in Meter Factor between start and stop measurements: True
Liquid Temperature
Flow changes during calibration (1)
0
50
100
150
200
250
300
0 20 40 60 80 100 120
Flow
rate
[kg/
min
]
Time [s]
0.99800
0.99840
0.99880
0.99920
0.99960
1.00000
1.00040
1.00080
1.00120
1.00160
1.00200
0 100 200 300 400 500 600 700 800
Met
er F
acto
r [--]
Flow rate [kg/min] / [L/min]
Calibration Coriolis meter 60 days before
500 L calibration
1500 L calibration
2500 L calibration
4000 L calibration
Calibration PD meter
0.04%
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!
3/26/14
14
Flow changes during calibration (2)
0
50
100
150
200
250
300
350
400
450
1 2 3 4 5 6 7 8 9 10
Time [s]
Flow
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
3/26/14
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
3/26/14
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!
3/26/14
17
VSL PO Box 654 2600 AR Delft The Netherlands T F E I Erik Smits E
+31 15 269 15 00 +31 15 261 29 71 [email protected] www.vsl.nl [email protected] !
Erik Smits: http://lnkd.in/K3Hbya
VSL group: http://lnkd.in/Bif3Sy
VSL Fluid Flow Metrology group: http://lnkd.in/DF2zJx @Erik_VSL Questions ?