OIL & GAS CH


Flange  | Corrosion  |  Hydrogen damages: HTHA / HIC  |  Welds  |  Nozzle  |  Cladding material

FLANGE CORROSION

TFM and PAUT combined on flange face corrosion: A dedicated application developed by Buffalo Inspection.

The Gekko and its TFM function allows high POD and clear result interpretation.

 

CORROSION INSPECTION

GEKKO FOR CORROSION INSPECTION

Corrosion< can induce wall thickness and pitting. Challenge is to map fast with high accuracy and high probability of detection. Thanks to the TFM, the dead zone is reduced: corrosion detection till 1mm under the surface, and the full description of the corroded profile for more accurate measurements. ©Institut de Soudure

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CORROSION MAPPING USING TFM

GEKKO FOR CORROSION INSPECTION

This video shows a comparison of TFM and Electronic scanning for differents defects in corrosion, using the same probe position.

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FIELD INSPECTION OF A NOZZLE

GEKKO FOR FIELD INSPECTION OF A NOZZLE

 

The Gekko offers the possibility to define on-board a nozzle component by simply entering the characteristics of the vessel and the nozzle (thickness, radius, angles).

Scan plans can be defined on the equipment to describe the motion of the transducer around the nozzle for either an encoded inspection with a scanner (using up to three axis: rotation, translation and skew) or a manual one.

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NOZZLE INSPECTION

GEKKO for NOZZLE INSPECTION

 

Uniquely compatible with up to 3-axis commercial scanners and with the possibility to define nozzle on-board, GEKKO is to be used for encoded nozzle inspections. The true-distance mapping of indications helps locating and sizing indications.

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WELDS

With TOFD and two Phased Array probes and scanner, the Gekko provides complete solutions. At 20 kHz PRF, the scan can be faster than competition.

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THICK WELDS

Thanks to it 64 elements the Gekko can focus the ultrasonic beam much farther and thus inspect thicker welds.

Small cracks can still be characterized at large depths.

In the example a 3-mm crack was found in the weld of a nozzle with a thickness of 121mm.

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AUSTENITIC WELDS

Ultrasonic inspection of austenitic welds is qualified for in-service inspection since beginning of 2000’s. Implementation of the solution based on the GEKKO associated to DMA probe makes work easier and faster.

Gekko for a special inspection utilizing DMA PAUT and TFM. The material is carbon steel with a single v inconel 625 butter.

 

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SCREW THREAD INSPECTION

27-mm long screw thread inspection with TFM technique. Optimal resolution is obtained along the thread.
Probe: PA, 5 MHz, 64 elements and a Pitch of 1.8mm.

©Karl Deutsch

 

 

HYDROGEN INDUCED CRACKING (HIC)

The molecular hydrogen formed in situ produces blisters, and adjacent blisters subsequently are connected on different planes in the metal.

HIC can be confused with laminations or volumetric inclusions.

Typical detection with phased-array is done with L0 electronic scanning which cannot see the connections between the cracks.

Hydrogen Induced Cracking (HIC)

 

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HYDROGEN INDUCED CRACKING (HIC)

GEKKO for HYDROGEN INDUCED CRACKING (HIC)

 

Hydrogen blistering characterization; HIC Small defect detection for carbon steel specimen inspection.
©Comex

HIGH TEMPERATURE HYDROGEN ATTACK (HTHA)

 

HIGH TEMPERATURE HYDROGEN ATTACK (HTHA)

HTHA damage is detected using AUBT method (Advanced Ultrasonic Backscattering Technique) that evaluates the frequency and velocity dependence to a non-damaged area

This technique requires skillful operators to recognize backscatter patterns, both a longitudinal and shear transducer and a clean OD surface to perform measurements.

HIGH TEMPERATURE HYDROGEN ATTACK (HTHA) M2M ndt

 

APPLICATIONS CASES USING PORTABLE FLAW DETECTOR GEKKO

 

GEKKO_v1.4_TRL

 

APPLICATION CASES USING INDUSTRIAL INSTRUMENTATION MULTIX++

 

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