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Custody Transfer 101 Theory and Application
Presentation to the GASNZ Industry Forum
November 2017
Innovative Gas Measurement Solutions
NZS 5259 SPECIFICATIONS
0 20 40 60 80 100
Capacity (% Qmax)
0
1
2
-1
-2 Err
or
Of
Ind
ica
tio
n (
%)
atm. air
Qmin / Qt : 0.05 Qmax / 0.2 Qmax
ACCURACY : +/- 1% ( Qt - Qmax ) / +/- 2% ( Qmin - Qt )
REPEATABILITY : 0.1% Span ( Qt - Qmax )
17,520,000 . Nm 3
G160 (250 m³/h) AT 1 bar OPERATING PRESSURE SHOWS AFTER 16 YEARS:
CONSEQUENCE OF 1% ERROR AT A YEARLY
GAS CONSUMPTION OF 25% Qmax
G-VALUE PRESSURE
0,02 bar
PRESSURE
1 bar
PRESSURE
4 bar
PRESSURE
8 bar
G65 (100 m³/h) 2200 4400 11000 20000
G100 (160 m³/h) 3600 7000 18000 32000
G160 (250 m³/h) 5700 11000 28000 51000
G250 (400 m³/h) 9200 18000 45000 81000
G400 (650 m³/h) 15000 29000 72000 130000
ERROR EXPRESSED IN Nm
AFTER 1 YEAR IN OPERATION
Turn Down Ratio
Monday
morning in the
winter Qmax
Turn Down Ratio
Summer
evening
Qmin
Turn Down Ratio
0 25 50 75 100
0
200
400
600
800
1000 TIME (CUMULATIVE)
INDUSTRIAL CONSUMER
0 25 50 75 100
CAPACITY (%Qmax)
0
2
-2
-4
-6
-8
-10
ERROR OF INDICATION (%)
TURNDOWN RATIO 20:1
TURNDOWN RATIO 10:1
0 25 50 75 100
CAPACITY (% Qmax)
0
200
400
600
800
1000TIME (CUMULATIVE)
FREQUENCY DISTRIBUTION INDUSTRIAL CONSUMER 2000
FREQUENCY DISTRIBUTION INDUSTRIAL CONSUMER 2005
Turn Down Ratio
Ultrasonic Gas Flow Meter
Ultrasonic Meter Principle
Multiple Paths
Qsonic 5
TURBINE GAS METERS
TURBINE WHEEL
BODY
FLOW CONDITIONERS
INDEX
OPERATING PRINCIPLE
GUIDING VANES
0 25 50 75 100 125
Capacity (%Qmax)
0
0.5
1
-0.5
-1
Error of indication (%)
air, atmospheric natural gas, 1bar
natural gas, 2bar natural gas, 4bar
Pressure effect (optimized turbine meter)
G400
G650
G1000
CARTRIDGE
IDENTICAL BEARING BLOCKS
OPTIMIZED BLADES = OPTIMIZING VELOCITY
ROTARY METER
G6 (1 1/2”) – G650 (6”)
How a rotary meter measures:
Domestic Diaphragm Meter
Electronic Volume Corrector
FMG Products
- ROTARY METERS
- TURBINE METERS
- EVCD / FLOW COMPUTERS
- TEST BENCHES / MASTER METERS
