1) The document evaluates different designs for a fiscal metering system with respect to lifecycle cost and benefits. 2) It analyzes design categories like liquid metering station types and configuration styles as well as flow measurement technologies for liquid and gas. 3) Key criteria for evaluation include price, accuracy, functionality, and reliability/maintenance, with the preferred solution being a design based on proven technology and including inline calibration.

1. FISCAL METERING SYSTEM DESIGN
- some design evaluations with respect to lifecycle
cost/benefit
NFOGM Temadag, Sola, 22 March 2012
Morten Marstein, Senior Systems Engineer, FMC Kongsberg Metering AS

2. 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

3. 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, maintenance
intervals, knowledge for maintenance

4. Evaluation – Design Categories
Price and
delivery time
Accuracy Functionality Reliability /
Maintenance
Sum
Conventional
with volume
prover
- + + - 0
Master
meter and
portable
prover
connections
0 0 + + ++
Inline meters
only
+ - - - --
Multi-phase
metering
+ - 0 - -
+ Advantage
- Disadvantage

5. Liquid Metering Station with Prover

6. Liquid Metering Station with Master Meters

7. Liquid USM Metering Station
- no master meter or proving facility

8. Multiphase Metering

9. Evaluation – Design Configuration
Price and
delivery time
Accuracy Functionality Reliability /
Maintenance
Sum
Serial
configuration
+ + + - ++
Parallel
configuration
0 + 0 0 +
Z-
configuration
- + + + ++

10. 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.
uncertainty
[%]
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

11. Flow Measurement Technologies
• Liquid
– PD (Positive Displacement) Meters
– Turbine Meters
– Ultrasonic Meters
– Coriolis Meters
• Gas
– DP Meters (Orifice, Venturi)
– Cone Meters
– Ultrasonic
– Coriolis

12. Evaluation – Flow Measurement
Technologies - Liquid
Price and
delivery time
Accuracy Functionality Reliability /
Maintenance
Sum
Liquid PD - + 0 0 0
Liquid
Turbine
0 + 0 + ++
Liquid
Ultrasonic
0 0 + 0 +
Liquid
Coriolis
+ 0 + + +++

13. PD Metering Station

14. Coriolis Metering Station

15. Evaluation – Flow Measurement
Technologies - Gas
Price and
delivery time
Accuracy Functionality Reliability /
Maintenance
Sum
Gas DP 0 - - + -
Gas Cone + - - + 0
Gas
Ultrasonic
0 + + - +
Gas Coriolis + 0 + 0 +

16. Gas Metering Stations

17. 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 technology
including inline calibration/verification arrangement