DMC / total energy metering.pptslide 1 July 01 Daniel Measurement & Control Kyoung Su Kim

DMC / total energy metering.ppt slide 1 July 01

DDaniel Measurement & Controlaniel Measurement & ControlDDaniel Measurement & Controlaniel Measurement & Control

KKyoung Su Kimyoung Su Kim


BUSINESS UNITS

DIVISIONS

Daniel and EmersonDaniel and EmersonDaniel and EmersonDaniel and Emerson


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 ).


The World MarketThe World MarketThe World MarketThe World Market

Whether you are BUYING or SELLING Gas or Liquid Petroleum Products

anywhere in the world ...

the name you can trust is


Ultrasonic Gas Flow Meters Ultrasonic Gas Flow Meters


Fundamentals of

Ultrasonic Flow Meters

Fundamentals of

Ultrasonic Flow Meters


Transit Time MeasurementTransit Time Measurement

Pulser Receiver Detector

Clock

Intrinsically Safe Transducer Signal Loop

100 MHz Oscillator

120 kHz Ultrasonic Signal

( Well Above Control Valve Interference at 60 kHz)


Ultrasonic TransducerUltrasonic Transducer

BackingMaterial

ElectricalLeads Piezoelectric

Disk

MatchingLayer(s)

Case

Voltage Output

120 KHz In

120 KHz Out

Intrinsically Safe24v DC input


Ultrasonic Flow MeterUltrasonic Flow Meter

Transit Time .004

LFlow

X

D

Transit Time .007 .003


Flow Equations

Any pair of transducers

Flow Equations

Any pair of transducers

tup = L

c - v(x/L)

tdn = L

c + v(x/L)

L

Flow

X

D


Flow Equations

Flow is determined from transit times

Flow Equations

Flow is determined from transit times

v =L2x

(t1-t2)

t1t2

c = L2

(t1+t2)t1t2

v = flow velocityc = speed of sound

t1 = upstream transit time (tup)t2 = downstream transit time (tdn)

2


Flow Velocity Measurement

Flowrate derived from velocity and area measurement

Flow Velocity Measurement

Flowrate derived from velocity and area measurement

Flowrate = Velocity times Area


SeniorSonic Calculation

Multipath means multiple velocity measurements!

SeniorSonic Calculation

Multipath means multiple velocity measurements!

Multipath Meter

A

B

C

D

Vn = L2 (t1-t2) 2x(t1t2)

Vavg = Wn Vn

4

n=1


Geometric Weighting Factors

Fixed factors depend on geometry only!

Geometric Weighting Factors

Fixed factors depend on geometry only!

Multipath Meter

A

B

C

D

WA= 0.1382WB= 0.3618WC= 0.3618WD= 0.1382


Chordal Velocity MeasurementChordal Velocity MeasurementChordal Velocity MeasurementChordal Velocity Measurement

AB

CD


Multipath Flowrate Calculation

Steps to determining flowrate

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


Flow Profile EffectsPower law velocity profile

N=5N=7N=9N=11N=15

Gas velocity is a function of position in pipe

V(r) = Vo (1-r/ro)1/n

Why Multiple Paths ?


Three Zone ExampleProfile and Area Representation


Path Average vs Flow Average

Individual Path Velocity is Average for that Path







AB

CD


Failed Chord Test Results – 4 inch MeterFailed Chord Test Results – 4 inch MeterFailed Chord Test Results – 4 inch MeterFailed Chord Test Results – 4 inch Meter

-0.20

-0.15

-0.10

-0.05

0.00

0.05

0.10

0.15

0.20

0 30 60 90

Velocity (ft/sec)

Err

or

(%)

Repeat Data

Failed Chord Data Difference = +0.008%


Summary of Inactive Path Results Summary of Inactive Path Results (19 meters)(19 meters)Summary of Inactive Path Results Summary of Inactive Path Results (19 meters)(19 meters)

SeniorSonic CEESI Inactive Path Results

-0.5

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

0.5

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Meter

Err

or

(%)

Average = 0.079%


Flow Rate CalculationsFlow 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 programWindows 95,98, NT, XP & 2000

Access flow data and diagnostics

Remote access via dialup modem

Built-in waveform viewerno need for oscilloscope


Meter monitoring screen


Product Improvements

Mark III Electronics w/DFI cardAudit trailDual Serial communication portsFrequency 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


Entire Electronics – CPU, DFI & PSEntire Electronics – CPU, DFI & PS


DFI, Power Supply & CPUDFI, Power Supply & CPU


Summary of Summary of Gas Gas Ultrasonic MUltrasonic Meter eter ((SeniorSonicSeniorSonic))

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 availableP / T input( Compensation)Retractable TransducersReplaceable Transducer Wiring

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 availableP / T input( Compensation)Retractable TransducersReplaceable Transducer Wiring




Two 20-Inch Custody SeniorSonic Meters


Three 30-Inch Custody SeniorSonic Meters


SeniorSonic Metering Skid

Documents

DMC / total energy metering.pptslide 1 July 01 Daniel Measurement & Control Kyoung Su Kim