As their names suggest, Hydrogen Induced Cracking (HIC) and Hydrogen Blisters are flaws caused by exposing carbon steel equipment to hydrogen. Hydrogen can find its way into material imperfections and form expanding internal pockets which can lead to HIC or Blister damage.
API 579-1, Part 7 assessments of Hydrogen Induced Cracking and Hydrogen Blisters are both included in INSPECT. Level 1 and 2 flaw assessments can be performed. As is the case with all flaw types in INSPECT, multiple HICs or Blisters can be specified on one component. This increases productivity and ensures factors including supplemental loads, nearby flaws and structural discontinuities are taken into account.