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[File Name or Event]Emerson Confidential27-Jun-01, Slide 1
Custody Transfer (Energy) Custody Transfer (Energy) Custody Transfer (Energy) z Since the early 80s it has become common for
companies to buy and sell energy (Dekatherm, MMBTU).
z AGA 5 / ISO 6976Energy = Corrected Volume (From FC) X Heating Value (From GC)
z AGA 8 Supercompressibility MethodsUsed to calculate the Corrected Volume
Gross 1: SG, BTU, CO2 (From GC)Gross 2: SG, N2, CO2 (From GC)Detail Method: Uses compositional breakdown of the Gas (From GC)
[File Name or Event]Emerson Confidential27-Jun-01, Slide 2
ApplicationApplicationApplication
z Gas Orifice
z Gas Turbine
z Gas Ultrasonic
Gas Liquid Provingz PD/Turbine
z Coriolis
z Ultrasonic
z Orifice
z Bi-directional
z Uni-directional
z Compact
z Master Meter
[File Name or Event]Emerson Confidential27-Jun-01, Slide 3
Gas Orifice ApplicationGas Orifice ApplicationGas Orifice Application
MPD
PD
PD
P
D T
VALVE POSITION
VALVE COMMAND (X2)
SYSTEM ALARM
PROCESS ALARM
COMPUTER ALARM
MASS TOTAL
SVOL TOTAL
RTD OR4-20mA
PULSES OR4-20mA
4-20mA
4-20mA
4-20mA
4-20mA
4-20mA
4-20mA
MASS FLOWRATE
SVOL FLOWRATE
ENERGY FLOWRATE4-20mA
RS232
MODBUS RS232ALARM/EVENT PRINTER
METERING STATION COMM.
SUPERVISORY (DCS)
[File Name or Event]Emerson Confidential27-Jun-01, Slide 4
Gas Turbine ApplicationGas Turbine ApplicationGas Turbine Application
[File Name or Event]Emerson Confidential27-Jun-01, Slide 5
Liquid Coriolis ApplicationLiquid Coriolis ApplicationLiquid Coriolis Application
[File Name or Event]Emerson Confidential27-Jun-01, Slide 6
Compact Prover ApplicationCompact Prover ApplicationCompact Prover Application
[File Name or Event]Emerson Confidential27-Jun-01, Slide 7
Software LayoutSoftware LayoutSoftware Layout
[File Name or Event]Emerson Confidential27-Jun-01, Slide 8
Calculation Flowchart (MFC)Calculation Flowchart (MFC)Calculation Flowchart (MFC)
Pulse input from USM Gross Volume Fr
Temperature
Pressure
Common Header FC
C6+ & H2O
ISO 6976/AGA 8
Std Density
Compressibility
Line DensityStd Volume Fr
Energy Fr
Mass Volume FrField Inputs
Heating Value
[File Name or Event]Emerson Confidential27-Jun-01, Slide 9
Calculation Flowchart (CHC)Calculation Flowchart (CHC)Calculation Flowchart (CHC)
MFC 11-X-2A
MFC 11-X-2B
C6+ Composition
H2O Component
C6+ & H2O
Station Totals
Station Flowrate
Supervisory Computer
Std Density
Meter Run FC
Inland Gas
Heating Value
[File Name or Event]Emerson Confidential27-Jun-01, Slide 10
Calculation Flowchart (MFC)Calculation Flowchart (MFC)Calculation Flowchart (MFC)
Pulse input from USM Gross Volume Fr
Temperature
Pressure
Common Header FC
C6+ & H2O
ISO 6976/AGA 8
Std Density
Compressibility
Line DensityStd Volume Fr
Energy Fr
Mass Volume FrField Inputs
Heating Value
[File Name or Event]Emerson Confidential27-Jun-01, Slide 11
z Formulae for Turbine Meter application
z Gross Volume Increment/Total (bbls)
z Standard Volume Increment/Total (bbls)
z Mass Increment/Total (lbs)
z Gross Volume Flowrate (bbls/h)
z Standard Volume Flowrate (bbls/h)
z Mass Flow Rate (lbs/h)
MFXKFplsQv =
VCFmQvQvstd =
5.61458= mQvQm
MFXKF
fq v 3600=
VCFmqq vvstd =
61458.5= mvm qq
[File Name or Event]Emerson Confidential27-Jun-01, Slide 12
z Standard Density (60F, 14.696 psia)z
z Meter Volume Correction Factor
z
VCF std
line =
mm CPLCTL VCF =
[File Name or Event]Emerson Confidential27-Jun-01, Slide 13
z Symbols used in Equationsz Qv- Total gross volume increment- bblz Qvstd- Incremental total volume at standard conditions- Sbblz Qm- Mass total increment- Mlbsz pls Number of pulses from the turbine meter in the sample period-z KF- K-Factor-pls/bblz MF- Meter factorz Qm- Mass flow rate- M.lbs/hz Qv- Gross volume flow rate- bbls/hz Qvstd- Standard volume flow rate- Sbbls/hz m- Density at the meter- lbs/ ft3z std- Density corrected to standard conditions- lbs/ ft3z CTLm- Correction Factor for the effect of temperature on the Liquid at the meterz CPLm- Correction factor for the effect of pressure on the liquid at the meterz VCFm- Meter volume correction factor