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Phased Array Ultrasonic Testing

Oil & Gas Industries

Basic concepts

The distinguishing feature of the phased array ultrasonic testing is the computer controlled excitation of the individual elements in a multielements probe. The excitation of these multiple piezo composite elements generates a focused ultrasonic beam, allowing the dynamic modification of the beam parameters such as angle, focal distance and focal spot size through software. To generate beam in phase by means of constructive interference, the various active elements are pulsed at slightly different times. Similarly, the echo from the desired focal point hits the various elements with a computable time shift. The echoes received by elements are time shifted before being summed together. The resulting sum in an A-scan that emphasizes the response from the focal point ad attenuates from other points in the test piece .

fig.1 : Beam Focusing

Beam Steering fig.2 : Beam Steering

Linear Scanning fig.3 : Linear Scanning

Dynamic Depth Focusing fig.4 : Dynamic Depth Focusing

Sectorial Scanning fig.5 : Sectorial Scanning

Advantages:
  • Multiple angle scan possible
  • Interpretation Simple
  • More Production rate
  • data storage
  • reproducibility
  • Setup time between inspections decreased
  • 100% volume inspection in single Scan
  • Better sizing of Defects

Acquisition System (OMNIScan - MUX) fig.6 : Acquisition System
(OMNIScan - MUX)

100% Covering  of  weld  with Combinations of Sectorial and  linear fig.7 : 100% Covering of weld with
Combinations of Sectorial and linear

Applications:
  • Inspection of girth welds of Pressure vessels
  • Corrosion Mapping
  • laminations checking
  • Tube and pipe weld inspections
  • Inspection of Tee-joints
  • issimmilar weld inspection
  • Power plant
  • Nozzle Testing
ESBeam Tool Software
  • Pre processing(Scan Plan) done with ESBeam Tool Software
  • Acquiring data done with OMNIScan- MXU
  • Post Proccessing (Data analysis) done with Tomoview Software
Main layout of the Tomoview Software  for defect Evaluation Fig 8: Main layout of the Tomoview Software for defect Evaluation

Root Crack fig.9 : Root Crack

lack of root Fusion fig.7 : lack of root Fusion

lack of Penetration fig.7 : lack of Penetration

Sievert Group of Companies