Flawed Pipeline Spools for In-Line Inspection (ILI)

Validation and calibration spools for ILI performance verification.

Our bespoke validation and calibration spools are designed to help you gain a comprehensive understanding of your ILI results, increasing the probability of flaw detection and accuracy.

We manufacture spools of up to 30ft in length, with flaws connected to the OD, ID or mid-wall. These can all be positioned within the electric resistance welded (ERW) seam, parent material or circumferential welds.

We offer a large variety of flaw types in any geometry and will work with you closely to determine the type, size, and location of flaws required to be implanted within the spool.  We work hard to ensure we meet your project requirements related to your integrity management objectives to the highest standard.

Recommended for

  • Validation of equipment capability
  • Training operators for field experience


  • Eddy current array (ECA)
  • Phased array (PA)
  • Time of flight diffraction (TOFD)


  • Carbon Steel

Typical flaws

  • Hook cracks
  • Penetrators
  • Electric discharge machining (EDM) notches
  • Crack fields (zero weld material)
  • Pitting and pinholes
  • Corrosion – light, gross and riverbed
  • Erosion – grooving and riverbed
  • High-low area with associated cracking
  • Grinding with associated cracking
  • Dents with associated cracking



Eddy Current Array (ECA) crack fields

Sonaspection recognizes the limitations of some weld-induced flaws for certain NDE methods and is constantly developing market-leading techniques to overcome these. For Eddy Current Array (ECA), Sonaspection has took on the challenge by creating crack fields with known lengths, heights and locations made without interfering with the performance of the NDE tools applied.

ECA crack field illustration

Alternate example of fluorescent crack field


Time of Flight Diffraction (ToFD) hook cracks

The images below demonstrate the accuracy of our validation and calibration when implanting flaws into ERW pipe seams.

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UK Office

UK (Head Office)

10 Woodgate
White Lund Industrial Estate

T +44 1524 34991
E info@sonaspection.com

USA Office

USA Office

6821 Belt Road
North Carolina

T +1 704-262-3384
E usa@sonaspection.com