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Innovative inspection method for HIC/SOHIC

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Performing most effective inspection by using data acquisition system developed by Mistras

Page last modified
Tuesday, September 6, 2022 - 12:00

Hydrogen induced cracking (HIC) and Stress-Oriented Hydrogen-induced Cracking (SOHIC) are failure mechanisms which are commonly found in oil and gas production, refining industry. This condition occurs e.g. where steel equipment is exposed to Wet Hydrogen Sulfide (H2S) environments. The defects are caused when hydrogen blisters form, in turn causing cracks that link these blisters together into larger defects. Since the blisters form at various depths, the cracking will appear as a stair-step appearance, called “stepwise cracking” , eventually leading to surface breaking cracks.


Reliable and cost effective working method
The dimensions and shape of laminations and/or cracks can be determined and visualized in millimetres
The detailed inspection report can be used to assess the condition and calculate the remaining service life (Fitness For Service Analysis (FFS))
High reproducibility of inspection
Experienced and trained staff
Non Intrusive Inspection (NII)
For most situations no shutdown required
Maximum inspection temperature 95° C - 180° C


Areas of Application Equipment exposed to Wet Hydrogen Sulfide (H₂S) environments.
Asset Life Extension Fitness For Service Analysis (FFS).
Safe Operating Detection in early stage to avoid leakage or explosions
Conditon-based Maintenance By FFS analyses.
ATEX Certification No.

Relative Business Impact

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Technology Readiness Level


Development Technology demonstration Mature / Proven
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MISTRAS Group is one of the world's largest suppliers of integrity and inspection services. We specialise in providing innovative asset integrity solutions for all projects using enhanced services that include asset monitoring, advanced and conventional NDT

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