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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) 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!!!!..

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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

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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%)

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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%?

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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!

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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

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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

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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

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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

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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

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= *<#><,>/>-;?/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

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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

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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!

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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!

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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

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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

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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!

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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 info@vsl.nl www.vsl.nl fsmits@vsl.nl !

Erik Smits: http://lnkd.in/K3Hbya

VSL group: http://lnkd.in/Bif3Sy

VSL Fluid Flow Metrology group: http://lnkd.in/DF2zJx @Erik_VSL Questions ?