The new Closed Loop pigsar
and its projected CMC
Jos van der Grinten, Detlef Vieth, Bodo Mickan
6th EFMWS - Barcelona, 16 - 19 April 2018 2 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Contents
▪ Introduction
▪ pigsar Calibration facilities
▪ Closed Loop pigsar (CLP)
▪ Calibration model
▪ Uncertainty analysis
▪ Traceability chain
▪ Current – Expansion – new developments
▪ Harmonized cubic metre
▪ Conclusions
6th EFMWS - Barcelona, 16 - 19 April 2018 3 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Introduction
Pigsar
▪ 1993
▪ 2003
▪ 2012
▪ 2013
▪ High accuracy calibrations
▪ ISO 17025 from DAkkS
▪ staatlich anerkannte Prüfstelle
▪ MID Module D
PTB
▪ 1887 established as PTR
Werner von Siemens
Hermann von Helmholz
▪ Top 3 of NMIs in the world
▪ Nobel prize winners
▪ SI units
▪ Industrial calibrations
▪ Legal metrology
▪ International cooperation
6th EFMWS - Barcelona, 16 - 19 April 2018 4 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
German National Standard
German National standard HP gas at pigsar
▪ High Pressure Piston Prover (1999)
▪ Critical flow Venturi nozzles
▪ Optical velocity standard (LDA – principle)
HPPP
Sonic nozzles
LDA
6th EFMWS - Barcelona, 16 - 19 April 2018 5 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Challenges
▪ Ultrasonic meters higher flowrates at the same D
▪ Bigger metering stations use DN400 – DN600 meters
▪ Customers require more flexibility
▪ HP transportation network does not become easier for bypass test facilities
▪ There are several new test facilities planned and in operation
▪ Closed loop concepts “work”
Decision taken to build a new closed loop facility at pigsar
New traceability chain?! Measurement uncertainty?! New primary standard?!
6th EFMWS - Barcelona, 16 - 19 April 2018 6 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
pigsar calibration facilities
Please note: The as-built facility may differ slightly from the information shown here.
6th EFMWS - Barcelona, 16 - 19 April 2018 7 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Closed Loop pigsar (CLP)
F
F
F
F
control room
energy supply
blower,
transformer
electrics,
metering,
control system
test sections
reference meter runs
primary + secondary references
hig
h p
ressu
re
Blo
we
r
Coo
ling
ga
s s
up
ply
Please note: The as-built facility may differ slightly from the information shown here.
6th EFMWS - Barcelona, 16 - 19 April 2018 8 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Comparison of test facilities
Closed Loop pigsar Current bypass pigsar
Actual volume flowrate 40 – 22 000 m3/h 3 – 6 500 m3/h
Absolute pressures 8 – 65 bar 17 – 50 bar *
Meter diameters DN200 – DN600 mm (8” – 24“) DN50 – DN 400 mm (2” – 16”)
Flanges and
pressure classes
ANSI 150 – 1500,
PN 16 – 64 **
ANSI 150 – 1500,
PN 16 – 64 **
Length of test section 24 and 33 meter 8 – 22 meter
Fluid Natural gas Natural gas
CMC uncertainty (𝑘=2) 0.13% – 0.18% 0.13% – 0.16%
Reference turbine meters 3 x 6” G400 + 3 x 20” G6500 4 x 4” G250 + 4 x 8” G1000
8 – 17 bar available on request ** Other flanges and pressure classes upon request
Please note: The as-built facility may differ slightly from the information shown here.
6th EFMWS - Barcelona, 16 - 19 April 2018 9 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Calibration model
▪ Mass conservation ▪ Line-pack Correction
▪ Integer pulse measurement ▪ 𝑝 = 𝜌 Τ𝑅 𝑀 𝑍 𝑇 𝑍(𝑝, 𝑇, 𝑥)
▪ Corrections for all systematic deviations
Reference MuT
(2) (1)
p pt t
6th EFMWS - Barcelona, 16 - 19 April 2018 10 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Uncertainty analysis
▪ When Line Pack can be neglected, is
▪ 𝑒𝑀𝑢𝑇 =𝑝𝑀𝑢𝑇
𝑝𝑀𝑢𝑇 + ∆𝑝
𝑁𝑀𝑢𝑇
𝑁𝑀𝑀
𝐼𝑀𝑀
𝐼𝑀𝑢𝑇
𝜏𝑀𝑀
𝜏𝑀𝑢𝑇
𝑍𝑀𝑀
𝑍𝑀𝑢𝑇
𝑇0 + 𝑡𝑀𝑀
𝑇0 + 𝑡𝑀𝑢𝑇− 1
▪ 𝑍 = 𝑧0 + 𝑍𝑖, 𝑧0 = 0, 𝑍𝑖 = 𝑍𝑖(𝑝, 𝑇, 𝑥)
▪ 𝑈(𝑧0) = 0.1% Uncertainty Algorithm ▪ 𝑈 𝑍𝑖 =𝜕𝑍𝑖
𝜕𝑝𝑈 𝑝𝑖
2
+𝜕𝑍𝑖
𝜕𝑡𝑈 𝑡𝑖
2
▪ 𝑈 𝑥𝑖 ≈ 10−7 Gas quality can be neglected
6th EFMWS - Barcelona, 16 - 19 April 2018 11 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Uncertainty – Monte CarloQuantity Unit X PDF mu sigma nu a b d x q Detail y Detail u(y)
pMuT bar X(1) Gaussian 50 0.0075 2.75E-06
∆pMM-MuT bar X(2) Gaussian 1 0.0052 1.03E-04
tMuT °C X(3) Gaussian 19 0.0451 1.55E-04
tMM °C X(4) Gaussian 20 0.0451 1.54E-04
T0 K X(5) Constant 273.15 0
NMuT - X(6) Constant 66000 0
NMM - X(7) Constant 65000 0
τMuT s X(8) Gaussian 100 0.0001 1.00E-06
τMM s X(9) Gaussian 100 0.0001 1.00E-06
z0 - X(10) Gaussian 0 0.10% 5.04E-07
ZMuT - X(11) Gaussian 0.89348 7E-05 7.45E-05
ZMM - X(12) Gaussian 0.89290 7E-05 7.47E-05
eMM - X(13) Gaussian 0.10% 0.08% 8.01E-04
eMuT,rep - X(14) Gaussian 0.00% 0.005% 5.00E-05
IMuT imp / m³ X(15) Constant 650 0
IMM imp / m³ X(16) Constant 650 0
Vdead m³ X(17) Gaussian 5 0.1 2.69E-05
τV s X(18) Gaussian 100 0.0001 1.34E-09
pstart bar X(19) Gaussian 50 0.0075 7.35E-06
pend bar X(20) Gaussian 51 0.0075 7.40E-06
tstart °C X(21) Gaussian 20.5 0.0451 7.51E-06
tend °C X(22) Gaussian 19.5 0.0451 7.75E-06
Zstart - X(23) Gaussian 0.89561 7E-05 3.64E-06
Zend - X(24) Gaussian 0.89218 7E-05 3.75E-06
Utot = 8,4·10-4
6th EFMWS - Barcelona, 16 - 19 April 2018 12 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Uncertainty analysis
Order of magnitude uncertainty Source
Actual flowrate 10-3 Traceability
Pressure difference and Temperature 10-4 Process
Repeatability MuT 10-4 Repeatability
Pressure 𝑝𝑀𝑢𝑇 10-6 Process
Time interval measurements 10-6 Process
Compressibility algorithm 𝑼(𝒛𝟎) = 𝟎. 𝟏% 10-6 Process
Gas composition [Literature] 10-7 ~ 10-8 Process
6th EFMWS - Barcelona, 16 - 19 April 2018 13 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Traceability – expansion
▪ HPPP 0.050%
▪ process conditions 0.056%
▪ repeatability 0.01%
Existing traceability chain Expansion
Flow range
3 - 480
m³/h
20 - 400 m³/h
3 - 20 - 1600 m³/h
80 - 1600
m³/h
80 - 6500 m³/h
320 -
6500 m³/h
40 - 22000 m³/h
m → Piston prover
→ 2 x
G250 →
1xG160 4xG250 master
→ 2xG1000 Transfer
→ 4 x
G1000 master
→
2xG250 2xG1000 2xG6500
→ →
3 x G400
G6500
↓ ↓ ↓
MuT MuT MuT
Target CMC 0,13% 0,16% 0,18%
pigsar
Closed Loop pigsar
▪ Long-term stability 0.075%
Target CMCs achievable
6th EFMWS - Barcelona, 16 - 19 April 2018 14 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Traceability
Everywhere the same question:
▪ "How far can you reduce measurement uncertainty?“
▪ "Is 0.10% available?"
New developments:
▪ Use correlations, example compressibility
▪ Traceability with fewer steps Transfer package
▪ Combining parallel, independent feedback chains?
Internal harmonized m³:
▪ Existing HPPP ▪ Critical flow Venturi nozzles
▪ New test standard: high-pressure comparator
6th EFMWS - Barcelona, 16 - 19 April 2018 15 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Transfer standards
DN 100
TM
T
TM
TM
T
T
DN 200
DN 200
DN 250DN 250
(a)
TM 2
TDN 400
TM 1
TDN 400
(b)
Please note: The as-built facility may differ slightly from the information shown here.
6th EFMWS - Barcelona, 16 - 19 April 2018 16 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Critical flow Venturi nozzles
▪ Measuring dimensions
▪ Boundary layer theory
(turbulent and laminar)
▪ Calibration with air
Application with Natural Gas
6th EFMWS - Barcelona, 16 - 19 April 2018 17 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Critical flow Venturi nozzle
50 bar natural gas
6th EFMWS - Barcelona, 16 - 19 April 2018 18 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
New High-Pressure Comparator
Thermal flow sensor
Comparator cannula
Distance sensor
Reflector
plug
Cable drum
Piston sensorsPower
10”prototype
6th EFMWS - Barcelona, 16 - 19 April 2018 19 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
New High-Pressure Comparator
New HP Comparator HP Piston Prover
Actual volume flowrate 40 - 1600 m3/h 3 – 480 m3/h
Absolute pressure 8 – 65 bar 17 – 50 bar *
Tube diameter DN 600 mm DN 250 mm
Piston stroke / effective stroke 6 m / 4 m 6 m / 3 m
Maximum piston velocity 1,8 m/s 3 m/s
Fluid Natural gas / air Natural gas
CMC Uncertainty (𝑘=2) 0,10% ** 0,065%
* 8 – 17 bar available on request ** Initial value, to be improved
Please note: The as-built facility may differ slightly from the information shown here.
6th EFMWS - Barcelona, 16 - 19 April 2018 20 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Traceability
6th EFMWS - Barcelona, 16 - 19 April 2018 21 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Harmonized cubic meter
▪ Intercomparison 8 – 20 – 50 bar, 20 – 6500 m³/h
▪ 2x DN100 + 2x DN150 + 2x DN250 + 2x DN400
▪ Parallel working standards higher harmonized flowrates reachable
▪ Harmonized m³ for flowrates > 6500 m3/h
▪ < 2014 NL only
▪ 2014 NL + DK
▪ 2020 NL + DK + DE
▪ Expanded measurement capabilities pigsar
▪ Also at 8 und 65 bar
▪ More labs smaller measurement uncertainty
better long-time stability
m³
6th EFMWS - Barcelona, 16 - 19 April 2018 22 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Conclusions
▪ The new Closed Loop pigsar (CLP) is under construction
▪ Parallel operation of both facilities possible
▪ Measurement capabilities are expanded with respect to pressure and flow
▪ Improved traceability for the industry
▪ By extending today’s traceability chain,
the target CMC measurement uncertainties can be achieved
▪ new developments
▪ Transfer standards, HP comparator, parallel traceability
▪ Reduction of measurement uncertainties
▪ Better fundament for the harmonized cubic meter
6th EFMWS - Barcelona, 16 - 19 April 2018 23 Jos van der Grinten, Detlef Vieth, Bodo Mickan | CLP Uncertainty
Questions
?
Physikalisch-Technische Bundesanstalt
Braunschweig und Berlin
Bundesallee 100
38116 Braunschweig, Germany
Dr. Jos van der Grinten & Dr. Bodo Mickan
Telephone: +49 531 592 1425 / … 1331
E-Mail: [email protected] / [email protected]
pigsarTM
Vier Gas Services GmbH & Co. KG
Halterner Straße 125
46284 Dorsten, Germany
Dr. Detlef Vieth
Telephone: +49 2362 93 8678
E-Mail: [email protected]
www.pigsar.de