Prevention First 2002 Conference

Inspection of Marine Terminal and Plant Piping Utilizing Long Range Guided

Ultrasonic Inspections

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Marine Terminal Piping Inspection

•Visual Inspections•Fit for Service Hydro•Ultrasonic Thickness Measurements

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Ultrasonic Measurements

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16” Line Underground

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Guided Ultrasonic Ltd.(GUL)

Wavemaker Pipe Screening System

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Waves are sent along the pipe

• Several hundred feet of pipe are examined from one location depending on pipe conditions.

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Typical Applications• Rapid, full coverage screening of pipe• Especially cost effective in difficult to access

locations– Monitoring overhead piping on columns– Corrosion under insulation (CUI)– Roadcrossings– Wall penetrations– Pipe racks– Pipe support point of contact corrosion

• Can detect cracks and general metal loss (greater than 3% of the cross-sectional area)

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How it works

• A ring of transducers is placed around the pipe

• No couplant is required

• Usually no surface preparation required

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Two types of waves can be used

Torsional

(twisting of the pipe)

Longitudinal

(compression of the pipe)

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Position of Ring

Decay CurvesCorrosion is indicated

by large red component

Iconic representationof identified features

ForwardBackward

Series of Welds

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0%0

1

50% 100%

The symmetric nature of a reflection can help classify it

Circumferential Extent (percent)

When the feature does not extend very far

around the circumference,

RED = BLACK

When the feature extends significantly around the circumference,

RED << BLACK

Am

plitude Ratio

More serious Less serious

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Small Diameter Pipes• Tested using solid

rings• For pipes 1 - 8

inches diameter• Can be mounted in

less than a minute• 3 inches clearance

needed around pipe

• Temperature limit of 300°F

8” Ring R2F8

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Large Diameter Pipes• Tested using

inflatable ring• For pipes 10 – 46

inches diameter• Employ conventional

foot pump to inflate• 2 inches clearance

needed around most of pipe

• Temperature Limit of 300°F

12” Ring R2B12

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650’ of Pipe Screened From a Single Location

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Long Range Guided Wave UltrasonicsPerforming CUI Inspection

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-10.0 0.0 10.00.0

1.0

2.0

3.0

Distance (m)

Am

p (m

V)+F1 +F2-F1 +F3+F4

DrainTypical Weld

Example of Insulated Pipe

13.0 14.0 15.0 16.00.0

0.5

1.0

1.5

Distance (m)A

mp

(mV)

+F3 +F4

0.0 1.0 2.0 3.00.0

1.0

2.0

3.0

Distance (m)

Am

p (m

V)

+F1

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General Condition of Pipe

0.0 5.0 10.0 15.0 20.00.0

2.0

4.0

6.0

8.0

10.0

12.0

Distance (m)

Am

p (m

V)

Clean Pipe

Generally Corroded Pipe

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Typical Road Crossing

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Example of Point of Contact

Corrosion Under

Supports

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Point of Contact

Corrosion Under

Supports

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Corrosion Noted in Elbow

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Example of Corrosion

Noted in Elbow

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Example of Weld

Examination

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Weld Examination

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Offshore Piping Inspection

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PlatformRiser

Inspection

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Long Range Guided Wave Limitations:

• Inspector qualifications and experience• Temperature limitations 300°F ?• Wave mode – Torsional or longitudinal ?• Insulation type• Design of supports• Pipe survey vs. Quantitative results• Pipe geometry

1. Flanges & valves2. Two to three elbows3. Branch connections

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Quantifying G.U.L. Inspection Results With B-Scan

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TMI-150Hard Copy Prints

• UNITEK Energy Service technicians take hard copy prints of corrosion pits to verify the pit profiles and provide a detailed report.

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Factory/ Company Certifications

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GUL Applications• Rapid, full coverage screening of pipe• Especially cost effective in difficult to access

locations– Monitoring overhead piping on columns– Corrosion under insulation (CUI)– Roadcrossings– Wall penetrations– Pipe racks– Pipe support point of contact corrosion

• Can detect cracks and general metal loss (greater than 3% of the cross-sectional area)