Transcript No Slide Title

Daniel Measurement & Control
Kyoung Su Kim
DMC / total energy metering.ppt
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July 01
Daniel and Emerson
BUSINESS UNITS
DIVISIONS
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July 01
Daniel is the leading, global supplier of precision flow
measurement equipment and instrumentation for gas
and liquid petroleum products in:
• production(생산),
• distribution(분배),
• storage(저장),
• and transportation applications(운송).
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July 01
The World Market
Whether you are BUYING or SELLING
Gas or Liquid Petroleum Products
anywhere in the world ...
the name you can trust
is
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July 01
Ultrasonic Gas Flow Meters
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July 01
Fundamentals
of
Ultrasonic Flow Meters
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July 01
Transit Time Measurement
Intrinsically Safe Transducer Signal Loop
Pulser
Receiver
Detector
120 kHz
Ultrasonic Signal
( Well Above Control Valve Interference at 60 kHz)
Clock
100 MHz Oscillator
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July 01
Ultrasonic Transducer
Case
Backing
Material
Electrical
Leads
Matching
Layer(s)
Piezoelectric
Disk
120 KHz In
Intrinsically Safe
24v DC input
Voltage Output
120 KHz Out
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July 01
Ultrasonic Flow Meter
Transit Time .004
X
D
Flow
.003
Transit Time .007
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July 01
Flow Equations
Any pair of transducers
tup =
L
X
c - v(x/L)
D
Flow
tdn =
L
c + v(x/L)
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July 01
Flow Equations
Flow is determined from transit times
2
L (t1-t2)
v=
2x t1t2
L (t1+t2)
c=
2 t1t2
v = flow velocity
c = speed of sound
t1 = upstream transit time (tup)
t2 = downstream transit time (tdn)
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July 01
Flow Velocity Measurement
Flowrate derived from velocity and area
measurement
Flowrate = Velocity times Area
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July 01
SeniorSonic Calculation
Multipath means multiple velocity
measurements!
A
B
C
D
2
Vn = L (t1-t2)
2x(t1t2)
4
Vavg =  Wn Vn
n=1
Multipath Meter
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July 01
Geometric Weighting Factors
Fixed factors depend on geometry only!
A
B
C
D
WA= 0.1382
WB= 0.3618
WC= 0.3618
WD= 0.1382
Multipath Meter
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July 01
Chordal Velocity Measurement
A
B
C
D
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July 01
Multipath Flowrate Calculation
Steps to determining flowrate
• Measure transit times for each path
• Calculate velocity for each path (A/B/C/D)
• Calculate "average" velocity
• Multiply velocity by meter body area
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July 01
Why Multiple Paths ?
Flow Profile Effects
Power law velocity profile
Gas velocity is a function
of position in pipe
V(r) = Vo (1-r/ro)1/n
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N=5
N=7
N=9
N=11
N=15
July 01
Three Zone Example
Profile and Area Representation
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July 01
Path Average vs Flow Average
Individual Path Velocity is
Average for that Path
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July 01
Chordal Velocity Measurement
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July 01
Chordal Velocity Measurement
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July 01
Chordal Velocity Measurement
A
B
C
D
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July 01
Failed Chord Test Results – 4 inch Meter
0.20
Repeat Data
Failed Chord Data
0.15
Difference = +0.008%
0.10
Error (%)
0.05
0.00
0
30
60
90
-0.05
-0.10
-0.15
-0.20
Velocity (ft/sec)
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July 01
Summary of Inactive Path Results (19 meters)
SeniorSonic CEESI Inactive Path Results
0.5
0.4
Average = 0.079%
0.3
Error (%)
0.2
0.1
0.0
-0.1
1
2
3
4
5
6
7
8
9
10
11
12
13
-0.2
-0.3
-0.4
-0.5
Meter
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July 01
14
15
16
17
18
19
Flow Rate Calculations
Flow Rate is Determined from Velocity
Measurement
All Flow Information is Dependent on
Correct Transit Time Measurement
Transit Time Measurements are
Performed by Electronic Means
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July 01
CUI Software
PC based interface program
Windows 95,98, NT, XP & 2000
Access flow data and diagnostics
Remote access via dialup modem
Built-in waveform viewer
no need for oscilloscope
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July 01
Meter monitoring screen
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July 01
Product Improvements
Mark III Electronics w/DFI card
Audit trail
Dual Serial communication ports
Frequency outputs
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July 01
Electronics Feature Summary
862 Hourly and Daily records
2849 Audit & 3640 Alarm records
Dual Modbus RS-232/485 multi-drop
Four frequency outputs (configurable)
P&T inputs (Compensated) and analog output
AGA 8 compressibility for corrected volume
Bi-directional meter factors
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July 01
Electronics Feature Summary (Cont.)
Configurable for control valve noise
24 Vdc or 110/220 Vac operation
Remote access capability
Replaceable transducer wiring
One electronics for all models
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July 01
Entire Electronics – CPU, DFI & PS
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July 01
DFI, Power Supply & CPU
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July 01
Summary of Gas Ultrasonic Meter
(SeniorSonic)
Diameter range:
DN 100 - 1050 (4”-42”)
Std Operating Temp:
-20 to +100 ºC
Pressure range:
Up to 2500# ANSI Class
Measurement channels:
4 Path(8 Transducer)
Explosion Proof:
EEx d ia IIB T4(ATEX)
Accuracy limits:
Repeatability:
Dry calibration +/- 0.30%
Flow calibration +/- 0.10%
<0.05% of reading
Velocity range:
0.3m/s to 30+m/s
Turndown:
Greater than 100 to 1
Features:
DMC / total energy metering.ppt
Bi-Directional Flow available
P / T input( Compensation)
Retractable Transducers
Replaceable Transducer Wiring
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July 01
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July 01
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July 01
Two 20-Inch Custody
SeniorSonic Meters
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July 01
Three 30-Inch Custody
SeniorSonic Meters
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July 01
SeniorSonic Metering Skid
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July 01