daniel gas ultrasonic - flowmeasurementworkshop.eu · custody transfer gas measurement • multi...

[File Name or Event] • Emerson Confidential • 4/10/2016 • Slide 1

Daniel Gas Ultrasonic The benefits of combination

of reflective and direct path

Thomas Sautier

Metering Product Manager

Flow Europe

March 2016


Introduction / Agenda

• Customers worldwide have adopted Ultrasonic flow measurement for Custody Transfer Gas Measurement

• Multi Path technology with generally either 100% Chordal or 100% Reflective paths configuration provides the best achievable calibrated accuracy… Both have Pros and Cons.

• Even if fiscal metering & dirty gas doesn’t go together well, the reality in the field is different.

• During operation, uncertainties due to process change, possible contamination, liquid & wet gas can be an issue.

• Emerson Daniel has 25 years of experience with both Chordal & Reflective technology and believe combination of best of both worlds can help

– To increase the confidence level of the US meter

– To get early warnings in case of process related issues of these operational uncertainties.

Agenda :

1. Chordal /Reflective comparison : Theorical & Applicative approach

2. Field cases in North America of combination of both technologies


Is chordal design better than reflective in fiscal Ultrasonic Gas

measurement?


General Comparison : Reflective Vs Chordal

Chordal Reflective

Robustness + -

Multi path configuration + +

Non axial flow cancellation - +

Resolution - +

Attenuation + -

Reynold’s dependency + -


Emerson Daniel Chordal Vs Reflective / Theorical appoach

• Multi Paths meters

• Horizontal paths

• Weighting

• Shorter length

• Average of weight chord velocities calculation

• 1 or 2 path meters

• Any orientation

• Travel center line

• Longer length (Approx Twice)

• Pipe Roughness / Reynold’s Correction in flow calculation

Daniel USM 3411/12

Reflective Paths Daniel USM 3414

Chordal Paths

VMean

835.0

.2703.0

0.2421

8.0

eRd

WRLOG

CF

CFQQCor . .

1221

1221

2

t. t

t- t . X 2

L V

n

iiaverage vwV1

AVQ average


• Less path configuration, lower accuracy

– Center line, No Weighting

• More sensitive to flow disturbance

– Effect on velocity for non developped flow profile / Error on CF

• In case of contamination / corrosion

– Path lengths change

– Pipe Roughness change Flow profiles become more pointed = Influence in CF

– Depending on build up, signal dispersed

• In case of wet gas / liquid

– Signal Attenuation / Path Lengths change / Deviated bounce (wave)

– Risk for liquid covering target bounce area

• Longer installation requirement

Daniel USM 3411/12

Reflective Paths

Emerson Daniel Chordal Vs Reflective / Applications

• Multi path design, best accuracy

• Less sensitive to flow disturbance

• In case of contamination / corrosion

– No effect on path lengths (except if contamination on transducer itself)

– Doesn’t affect the SOS & velocity measurement

– Overeading in Q caused by contamination

• In case of wet gas

– No effect on path lengths

– More Gain

• Reduced installation requirement

Daniel USM 3414

Chordal Paths


Emerson Daniel Chordal Vs Reflective / Diagnostics

• Multiple paths then multiple diagnostics

• Basic Functional diagnostics

SOS / Gain / Performance / SNR

• Advanced Dynamic Flow Based diagnostics

Profile factor /

Symmetry / Cross flow / Swirl

• 1 or 2 paths, less diagnostics

• Only Functional Diagnostics

Daniel USM 3411/12

Reflective Paths Daniel USM 3414

Chordal Paths


Chordal + Reflective / Contradictive Combination

Chordal Paths Reflective Path

Best Accuracy

Still Measure with harsh conditions

ROBUSTNESS

Responsive with pipe wall change

Early detection in case of liquid

SENSITIVITY +


Field case : Gas Pipeline Company in NA

• Big number of metering stations equiped with several metering lines since more than 15 years

• Size 6’’ to 12’’

• Unidirectional or bidirectional metering installations

• Remote site, takes few hours to get in the metering stations


Typical applications / Combination of Junior & Senior

• All metering stations is a combination of a primary meter Senior & Check meter Junior sonic.

• Alarm if >1% deviation between 2 meters over 24h

• Typical customer issue for gas measurement

– Shale gas / sludge => no consistant

– Operational Issues during production

– Grease from valve, components.

– Construction debris

• Purpose of the combined installation

– Check the integrity of their Fiscal Measurement

– Early warnings of process change

– Part of quality standard

– Meet stringent local regulations

– Intervention program (extend calibration period)

PRIMARY METER

SENIOR SONIC

4 PATHS CHORDAL

CHECK METER

JUNIOR SONIC

1 PATH REFLECTIVE


TC Typical applications / Layout

• Includes Flow conditioner

• 5 + 10 D Upstream

• Specific 10D design for Junior Sonic with tapping


Field Case / Oil Film detection

Pipe Wall Contamination

with Viscous Fluid Coating

DIAGNOSTIC

BASELINE VIEWER

No indication of process change

in the most advanced

Dynamic Flow Diagnostics

1P 1C

2P 2C





Deviation

between 1P & 1C

Clear Continuous Slow shift

away in indicates clearly process

change

1P 1C

2P 2C

-3,00%

-2,00%

-1,00%

0,00%

1,00%

2,00%

3,00%

4-25-2014 5-10-2014 5-25-2014 6-9-2014

1P vs 1C





Deviation

between 1P & 1C / 2P & 2C

Deviation between 1P/1C shows

stronger deviation because of

contamination.

1P 1C

2P 2C

-20

-15

-10

-5

0

5

10

15

20

% diff. 1P/1C % diff. 2P/2C


Field Case / Blockage & Debris

Flow Conditioner Blockage

1P 1C

-2,00%

-1,50%

-1,00%

-0,50%

0,00%

0,50%

1,00%

1,50%

2,00%

2,50%

3,00%

3,50%

1P-1C

“It was fairly consistent at 3%

variance between 1P and 1C. WE

were surprised at how little of an

obstruction it was though...we

were betting on an object much

bigger than that. Shows exactly

how sensitive these meters are.”

Standard deviation

between 1P & 1C

Clear Deviation of about 3%

during more than 15 days.

Suspision of a major operational

issue…


Field Case / Blockage

Flow Conditioner Blockage

DIAGNOSTIC



Dynamic Flow Diagnostics a

1P 1C

Primary meter Flow

Rate

It looks like it still

measures correctly…

Even if the meter raises

an alarms in flow profile

« Possible Blockage

detected ».

Error in 1P-1C standard

deviation help to clearly

proove it is not a false

alarm

Before Blockage

removed

After Blockage

removed

[File Name or Event] • Emerson Confidential • 4/10/2016 • Slide 17 Flow Conditioner Blockage

DIAGNOSTIC




Our customer notes the

magnitude of shift

between the two meters

which they take into

account when doing

maintenance or shutdown

planning. Large error,

means immediate action.

Small shifts first mean

going through logs rather

than a shutdown.

Field Case, same customer. Similar experience

[File Name or Event] • Emerson Confidential • 4/10/2016 • Slide 18 Valve Grease

DIAGNOSTIC




Our customer also notes

the magnitude of shift

between the two meters

which they take into

account when doing

maintenance or shutdown

planning. Large error,

means immediate action.

Small shifts first mean

going through logs rather

than a shutdown.

Field Case, same customer. Similar experience


Test at Calibration Facility / Blockage

Significant error results from

small amounts of blockage

DIAGNOSTIC



Dynamic Flow Diagnostics -6,00

-5,00

-4,00

-3,00

-2,00

-1,00

0,00

1,00

100,00 70,00 50,00 40,00 20,00 10,00 3,00

Blockage Test 1 - Shift from Baseline (Primary vs Check Meter) H1 4 Path 2 Path Blockage Tests

-6,00

-5,00

-4,00

-3,00

-2,00

-1,00

0,00

1,00

100,00 70,00 50,00 40,00 20,00 10,00 3,00

Blockage Test 2 - Shift from Baseline (Primary vs Check Meter) H1 4 Path 2 Path


Test at Calibration Facility / Build Up

Significant error results from a small amount of buildup

DIAGNOSTIC



Dynamic Flow Diagnostics -1,00

-0,50

0,00

0,50

1,00

1,50

2,00

100,00 70,00 50,00 40,00 20,00 10,00 3,00

Buildup Test 5- Shift from Baseline (Primary vs Check Meter) H1 4 Path 2 Path

-1,00

-0,50

0,00

0,50

1,00

1,50

2,00

100,00 70,00 50,00 40,00 20,00 10,00 3,00

Buildup Test 6- Shift from Baseline (Primary vs Check Meter) H1 4 Path 2 Path

T5 T6

Buildup Tests


Conclusion

• We have seen that both Chordal or Reflective paths configuration have Pros and Cons.

• Combining them in a smart way provides added value :

– Detection of liquid / build up / contamination / blockage

– Easy to understand on line comparison versus “complex” diagnostics

• Daniel has combined these 2 contradictive technologies in a single meter body to enable wider usage of this method.

• Without compromising robust fiscal measurement, sensitivity has been added to detect metrological relevant process issues.

• Please come to our booth to discover these added values in a single gas meter.


Thank you & acknowledgment

• Thanks to European Flow Measurement Workshop organisator

• Thanks to David Brown, Business Development Manager, Ultrasonic, Canada / Jacob Freeke, Director Marketing Ultrasonic, for their help preparing this presentation

• Thanks to our customer to use their field data

• Thanks to the audience for listening !

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