a long range ultrasonic technique for survey of pipework ...farajoosh-co.com/files/tests/teletest...

Plant Integrity Limited

Teletest ®

A long range ultrasonic technique for survey of pipework and pipelines


Teletest ®


Teletest ®

Reduction in the access costs

No removal of insulation

Inspect inaccessible areas (clamps)

Inspect buried pipes

The whole pipe wall is tested

Guided waves offer the following:


Teletest ®

Background to the technique


Teletest ® Modular tooling

6" to 48"


Teletest ® UK Tank Farm

6" import line

Weld

Weld

Weld

Weld

Weld


Teletest ®

Internal Corrosion/Erosion

External Corrosion

Teletest® is sensitive to

loss of pipe wall cross-section


Teletest ®

Weld

Minor Feature

Moderate

Feature

UK Chemical Plant

8" Monomer Line


Teletest ® Report Format


Teletest ®

Test Performance


Teletest ®

• Diameters

–2" to 48"

• Coverage

– 100%

• Test Range

–Typical ±30m

–Under ideal conditions ±180m

• Productivity

–Typical 300m per day

• Temperature

–Can be used on pipes in service up to +125°C

Features


Teletest ®

Case Studies


Teletest ®

Validation of a 3.5km Heavy Fuel Oil Line

• Problem areas highlighted for inspection

- Road Crossings - Damaged insulation

- Corroded Casing - Evidence of Flooding

- Damaged Steam Tracing

• Solution

- 30 locations identified for Teletest® survey

- 800m of line tested in 4 days

- Metal loss features found at 12 positions - confirmed

- Teletest® adopted by Refinery’s NDT Service Provider

Case History

UK Refinery


Teletest ® Corrosion detected

~ 150 x 50 x 1.5mm deep


Teletest ®

• Riser Inspection • End customer PDVSA

• Main contractor TechCorr

• Teletest could inspect splash zone

• ‘Splashtron’ coating posed no problem

Case History

Lake Maracaibo


Teletest ® Lake Maracaibo

Riser Inspection

Teletest®

tool


Teletest ® Lake Maracaibo

Riser Inspection


Teletest ®

Annual road crossing inspections - 1999 to 2004

• Problem

- Road and Caribou Crossings up to 45m wide

- Pipe diameters from 6" to 42"

- Pipes contain oil, gas, water or a combination

- Pipes insulated with polyurethane foam

- Corrosion at field applied weld packs

• Solution

- Up to 175 crossings tested per annum at three production fields

- Teletest has identified corrosion at road crossings

- Confirmed by follow-up inspection

Case History

Alaska USA


Teletest ® Alaska

24" Road Crossing


Teletest ®

Weld

Weld

Reportable Feature

Alaska

24" Road Crossing


Teletest ®

Weld

Moderate Feature

Alaska

24" Road Crossing


Teletest ® Alaska

24" Road Crossing


Teletest ®

• Water injection lines in oil processing facility

• Plastic coated lines 27 years old

• Some leaks have occurred

• Lines pass beneath process plant and control

room

Case History

10" buried lines


Teletest ® Case History

10" buried lines


Teletest ®

Welds

Corrosion

Case History

10" buried lines


Teletest ® Case History

10" buried lines


Teletest ®

• APT (UK)

• ARCO (Alaska)

• BNFL (UK)

• BP (UK, USA)

• Caltex (Indonesia)

• Chevron (Venezuela)

• Conoco (UK)

• Dow Chem (Germany)

• Exxon (UK, USA)

• Hindustan Petroleum (India)

• Huntsman Chem. (USA)

• Loop LLC (USA)

• Maersk Oil (Denmark)

• Norsk Hydro (France)

• ONGC (India)

• PDVSA (Venezuela)

• Petrobras (Brazil)

• Phillips (USA)

• Shell (UK, SE Asia, USA)

• ST Services (UK)

• Suncor (Canada)

• TotalFinaElf (UK)

• Ultramar (Canada)

• Vopak (NL)

Clients


Teletest ®

Method Elevated Insulated Buried

Visual 2.0 5.0 10.0

Manual UT 2.5 5.0 10.5

Mechanised UT 9.0 11.5 17.0

Prof ile RT 6.0 5.5 14.5

Pulsed EC 7.0 5.5 15.0

MFL 11.0 10.0 16.0

Teletest® 1.1 1.0 1.3

Comparative costs to inspect 100m of 12-inch pipe

Comparison of

Inspection Costs


Teletest ®

New Developments


Teletest ® Unfocused result

Unfocused result

0

50

100

150

200

250

0.0

1

0.2

2

0.4

4

0.6

6

0.8

7

1.0

9

1.3

1

1.5

2

1.7

4

1.9

6

2.1

7

2.3

9

2.6

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2.8

2

3.0

4

3.2

6

3.4

8

3.6

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3.9

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4.7

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4.9

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6.0

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7.8

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8.0

3

8.2

4

8.4

6

m

sig

na

l a

mp

litu

de

Notch position

Pipe endInitial pulse


Teletest ® Focused result

Focused result

0

50

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200

250

0.0

1

0.2

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0.6

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0.8

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1.0

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1.7

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1.9

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2.1

7

2.3

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2.6

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2.8

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3.0

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6

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3.9

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6.0

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7.1

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7.3

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7.5

9

7.8

1

8.0

3

8.2

4

8.4

6

m

sig

na

l a

mp

litu

de

Initial pulse

Notch signal

Pipe end


Teletest ® Multimode™ Instrumentation


Teletest ® Improved software


Teletest ®

Plant Integrity Ltd

http://www.plantintegrity.co.uk

A Member of the TWI Group

Contact us at:-

a long range ultrasonic technique for survey of pipework ...farajoosh-co.com/files/tests/teletest...

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