Transcript Identifying dominant measurements errors in fully

Identifying dominant measurements errors in
fully automated water networks
PWN Waterleidingbedrijf Noord-Holland
Water technology
Lucyna Magda
July 16, 2015
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July 16, 2015
Content
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Problem definition
Errors in mass balances
Flowmeter In-Situ calibration and its constraints
Vendors who sell this kind of equipment
PWN-state of the art
List of companies who use this kind of equipment
Recommendations- advice on application.
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Scope of the presentation
Calibration
Water
balances
Flowmeters
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Water balance
Water
balances
∑(OUT-IN)-dS/dt=0
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PWN-Validatie ruwwaterstrom 2002
• Up to 70% of water
balances are doubtful
• All balances show
systematic error-bias
• The errors are in the
reach 3000 m3/day
Water
balances
Possible causes:
Leakage
Additional inflow
Flowmeters
malfunctioning
• RESULT OF THE
ANALYSIS
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MSc: Water Resources Management , Lucyna Magda
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Problem definition
Water
balances
Malfunctioning field devices, including flowmeters cause
process disturbances and errors in mass balances
When such devices monitor themselves, faults can be
detected and reported at an early stage, greatly
reducing their impact on the process.
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Problem definition
Water
balances
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Problem definition
Water
balances
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Errors in mass balances
Water
balances
Faults are frequently not the result of an instrument
defect but application-related malfunctioning:
• device selection and sizing,
• unsuitable installation,
• application problems.
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Type of the errors
Water
balances
1. Systematic Errors
2. Accidental and Random Errors
Vendors: gross errors = systematic if proper installed.
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Errors from the flowmeters
Water
balances
Gross error
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e - the manufactory error,
b - a systematic error
x - systematic component of the random error
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Flowmeters types-choice dilemma
Flowmeters
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Flowmeters best application
Flowmeters
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Flowmeters surrounding errors
Flowmeters
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Electromagnetic Flowmeter
Flowmeters
(1) U = K × B × v × D
K instrument constant
B magnetic field strength
v mean flow velocity
D electrode spacing
The volumetric flow rate qv can be calculated according to
(2) qv = v × D² × π/4
It follows from equation (1) that
(3) v = U / K×B×D
Therefore:
(4) qv = (U / K×B) × D × π/4
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Flowmeter: Primary and Secondary
Flowmeters
Secondary
Primary
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Examples of Primary and Secondary
Flowmeters
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Wet Calibration
Calibration
1.
3.
2.
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Calibration
Dry Calibration- Flowmeter Secundary
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Calibration
Verification techniques- Flowmeter Primary
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Calibration
Verification techniques- Flowmeter Secundary
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Flowmeter calibration-a typical calibration curve
Calibration
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Vendors
Name
Emflux
Heinrichs
Tokimec
Juergen
July 16, 2015
Calibration
Number of flowmeters
at PWN
Expanded
diagnostic
Verification techniques
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CallMaster
MagMaster
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COMBINED EMFLUX
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Field Check
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UMF
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Optiflux
MAGCHECK
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TOKYO KEIKI
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SIMENS VERIFICATOR
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COMBINED EMFLUX
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PWN-state of the art
Calibration
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MSc: Water Resources Management , Lucyna Magda
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Recommendations
Calibration
• How to choose which flowmeters should be replaced:
• Water Balances that do not pass validation
and the following set in the importance order:
• Plenty control strategic points
• Plenty Performance
• Plenty Cardio
• PT-Monthly Reports
• Setpoint related flowmeters
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PWN- Schematic representation of WRK
Calibration
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PWN- Schematic representation of WRK
Calibration
Bed water mass
balances
Plenty control
biggest
importance
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MSc: Water Resources Management , Lucyna Magda
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PWN- Schematic representation of WRK
Calibration
Bed water mass
balances
Plenty control
biggest
importance
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MSc: Water Resources Management , Lucyna Magda
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PWN- Schematic representation of WRK
Calibration
Bed water mass
balances
Plenty control
biggest
importance
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Recommendations
Calibration
• Electromagnetic flowmeters at Bergen should be
replaced with the footprinted flowmeter
• Electromagnetic flowmeter at Secundairs 9-10 should
be replaced with the ultrasonic 3-beams flowmeter
• I recommend periodic pipe inspecions near the
extraction point
• I recommend structural changes where it is possible to
increas the flushing of the sediments
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Similar projects in The Netherlands
• Grolsh brewery in Enschede- Optiflux 4000 and mass
flowmeters
• Detroit water and Sewage Department- Mag master
and Call Master
• Both cases have been published with positive reviews
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QUESTIONS?
5 min
July 16, 2015
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Thank you for you attention.
July 16, 2015
Special thanks to:
Ignaz Worm,
Eric de Vos,
Henk van Duist,
Harry Rolf,
and everyone else from the Water Technology team
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