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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