Inspection Services


In-line inspection (ILI)

For the last decennia, pipeline operators have invested in launchers and receivers and numerous related appendages, to make pipelines piggable and regular inspections possible.

To supply this market with a competitive ultrasonic inspection tool, A.Hak has developed a new addition to the Piglet® family – the In-line Inspection (ILI) tool. This new ILI tool provides a flexible platform to enable inspection of these lines online and while immersed in product, such as liquid.

The tool is propelled through the line by the liquid and, due to it’s enhanced velocity, allows more options for using batches in gas pipelines.

Our tool combines the advantages of ‘free-swimming’ and ‘cable-operated’ inspection systems and, as a result, has eliminated the disadvantages of both. Furthermore, the system is suitable for passing small radius bends, mitred bends and multiple diameters, and can be bi-directional.

The measurement technique used is ultrasonic. The Piglet® tool is equipped with a measuring device that uses ultrasound waves for measuring the wall thickness and inner radius of the pipe.

The ILI-Piglet system has the ability to:
  • Inspect pipeline lengths up to 40 km in one run
  • Negotiate an unlimited number of bends
  • Travel in two directions (bi-directional)
  • Inspect multiple diameters in one run
  • Store data on-board as well as provide all ultrasonic measurements online
  • Save raw ultrasonic data for detailed post-processing analysis.
Using our in-house developed inspection tool, in combination with our highly qualified personnel and the most sophisticated software, the final report is the deliverable component of a pipeline inspection. The purpose of our data analysis and final report is to accurately inform pipeline owners and operators of their asset’s condition.

Our final reporting service is based on an intelligent data analysis system controlled by our highly trained data analysts. When it comes to reporting, quality and accuracy are essential. All work performed by our data analysts is reviewed and verified by an additional level 2 or level 3 data analyst. In addition, all final reports are independently reviewed and verified by a level 3 data analyst.

During data analysis and final reporting we carry out a defect assessment as standard and offer fitness-for-purpose reporting if required. We also offer:
  • Immediate notification policy – any feature with a depth ≥ 80% or a failure pressure ≤ MAOP must be reported immediately to the client
  • Integrity management through PIMS software
  • Defect assessment: ASME B31.G, Modified B31.G, RSTRENG, SHELL92, DNV
  • Corrosion growth rate analysis – back-to-back or historical.


A.Hak Industrial Services B.V.
Steenoven 2-6
4196 HG Tricht
P.O. Box 151
4190 CD Geldermalsen
The Netherlands
T +31 (0)345 579 211

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