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D aniel Measurement & Control. K young Su Kim. Daniel and Emerson. BUSINESS UNITS. DIVISIONS. Daniel is the leading, global supplier of precision flow measurement equipment and instrumentation for gas and liquid petroleum products in: production( 생산 ), distribution( 분배 ),
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Daniel Measurement & Control Kyoung Su Kim
Daniel and Emerson BUSINESS UNITS DIVISIONS
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).
Whether you are BUYING or SELLING Gas or Liquid Petroleum Products anywhere in the world ... the name you can trust is The World Market
Fundamentals of Ultrasonic Flow Meters
Transit Time Measurement Intrinsically Safe Transducer Signal Loop Detector Pulser Receiver 120 kHz Ultrasonic Signal ( Well Above Control Valve Interference at 60 kHz) Clock 100 MHz Oscillator
120 KHz In Voltage Output 120 KHz Out Ultrasonic Transducer Intrinsically Safe 24v DC input
Ultrasonic Flow Meter Transit Time .004 X D Flow L .003 Transit Time .007
L tup = X c - v(x/L) D Flow L L tdn = c + v(x/L) Flow EquationsAny pair of transducers
Flow EquationsFlow is determined from transit times 2 (t1-t2) L v = t t 2x 1 2 v = flow velocity c = speed of sound L (t +t ) 1 2 c = t = upstream transit time (tup) 2 t t 1 1 2 t = downstream transit time (tdn) 2
Flow Velocity MeasurementFlowrate derived from velocity and area measurement
SeniorSonic CalculationMultipath means multiple velocity measurements! Vn = L2 (t1-t2) 2x(t1t2) Vavg = Wn Vn A B C 4 D n=1 Multipath Meter
Geometric Weighting FactorsFixed factors depend on geometry only! WA= 0.1382 WB= 0.3618 WC= 0.3618 WD= 0.1382 A B C D Multipath Meter
Chordal Velocity Measurement A B C D
Multipath Flowrate CalculationSteps 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
Flow Profile Effects Power law velocity profile Why Multiple Paths ? Gas velocity is a function of position in pipe N=5 N=7 N=9 N=11 1/n V(r) = V (1-r/r ) o o N=15
Three Zone Example Profile and Area Representation
Path Average vs Flow Average Individual Path Velocity is Average for that Path
Chordal Velocity Measurement A B C D
Failed Chord Test Results – 4 inch Meter Difference = +0.008%
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
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
Product Improvements • Mark III Electronics w/DFI card • Audit trail • Dual Serial communication ports • Frequency outputs
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
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
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: Dry calibration +/- 0.30% Flow calibration +/- 0.10% Repeatability: <0.05% of reading Velocity range: 0.3m/s to 30+m/s Turndown: Greater than 100 to 1 Features: Bi-Directional Flow available P / T input( Compensation) Retractable Transducers Replaceable Transducer Wiring
