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FISCAL METERING SYSTEM DESIGN
- some design evaluations with respect to lifecyclecost/benefit
NFOGM Temadag, Sola, 22 March 2012
Morten Marstein, Senior Systems Engineer, FMC Kongsberg Metering AS
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Design Categories
Case: Liquid Metering Station
Design
Conventional liquid metering station with volume prover
Liquid metering station with master meter and portable prover
connections
Liquid metering station with master meter (no inline proving)
Multi-phase metering
Configuration
Serial configuration
Parallel configuration
Z-configuration
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Evaluation Criterias
Price and delivery time (project phase)
Cost of parts, engineering, complexity
Accuracy
Conformance to fiscal accuracy requirements
Functionality
Flow range, online maintenance, online calibration, online diagnostics
Reliability / Maintenance cost
Maintenance and diagnostics facilities, complexity, maintenanceintervals, knowledge for maintenance
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Evaluation Design Categories
Price anddelivery time
Accuracy Functionality Reliability /Maintenance
Sum
Conventional
with volumeprover
- + + - 0
Mastermeter andportableproverconnections
0 0 + + ++
Inline metersonly
+ - - - --
Multi-phasemetering
+ - 0 - -
+ Advantage
- Disadvantage
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Liquid Metering Station with Prover
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Liquid Metering Station with Master Meters
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Liquid USM Metering Station- no master meter or proving facility
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Multiphase Metering
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Evaluation Design Configuration
Price anddelivery time
Accuracy Functionality Reliability /Maintenance
Sum
Serialconfiguration
+ + + - ++
Parallelconfiguration
0 + 0 0 +
Z-configuration
- + + + ++
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Serial vs. Parallel Configuration
0
0,2
0,4
0,6
0,8
1
1,2
-1 -0,5 0 0,5 1
Rel.comb.std.unc
ertainty
[%]
Correlation
Two meters in series
0
0,2
0,4
0,6
0,8
1
1,2
0 20 40 60 80 100
Rel.comb.std.uncertainty
[%]
Percentage of flow in pipe 2
Two meters in parallel
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Flow Measurement Technologies
Liquid
PD (Positive Displacement) Meters
Turbine Meters
Ultrasonic Meters
Coriolis Meters
Gas
DP Meters (Orifice, Venturi)
Cone Meters
Ultrasonic
Coriolis
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Evaluation Flow MeasurementTechnologies - Liquid
Price anddelivery time
Accuracy Functionality Reliability /Maintenance
Sum
Liquid PD - + 0 0 0
Liquid
Turbine
0 + 0 + ++
LiquidUltrasonic
0 0 + 0 +
LiquidCoriolis
+ 0 + + +++
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PD Metering Station
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Coriolis Metering Station
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Evaluation Flow MeasurementTechnologies - Gas
Price anddelivery time
Accuracy Functionality Reliability /Maintenance
Sum
Gas DP 0 - - + -
Gas Cone + - - + 0
GasUltrasonic
0 + + - +
Gas Coriolis + 0 + 0 +
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Gas Metering Stations
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Important Issues in the Project Phase
Metering knowledge at Operator / Contractor
Calibration arrangement (provers, master meters)
Proven technology
Combine measurement techniques Quality (fluid property) measurements
Preferred solution:
Solid technical design based on proven technologyincluding inline calibration/verification arrangement