Fiscal metering system design evaluation
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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.
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Fiscal metering system design evaluation
- 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
- 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 + + +++
- 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 +
- 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