Inspectioneering
Explore this topic

Overview of Stress-Oriented Hydrogen Induced Cracking (SOHIC)

Stress-Oriented Hydrogen Induced Cracking (SOHIC) is a common, insidious form of wet H2S cracking. SOHIC is a type of cracking that can easily lead to failure and needs to be mitigated. It is made up of a series of HIC (hydrogen induced cracking) cracks that are stacked perpendicularly in the direction of through wall cracks and driven by high residual or applied stresses. It's fairly well known that above 50 ppm of H2S content, below 180F temperature in aqueous sour waters, that our pressure equipment is susceptible to wet H2S cracking. It's also fairly well known that cyanides in overhead systems of cat crackers and cokers can significantly increase susceptibility.

All susceptible systems should be inspected and maintained according to the latest edition of NACE RP0296. Equipment that is susceptible to SOHIC needs to be post weld heat treated (PWHT) or alloyed up. HIC resistant steels and polymeric coatings have been successfully applied, as well as stainless steel clad materials in more aggressive environments.

 

Is this definition incomplete? You can help by contributing to it.

Share this Topic

Related Topics

Amine Stress Corrosion Cracking (SCC) Ammonia Stress Corrosion Cracking Brittle Fracture Carburization Caustic Stress Corrosion Cracking (Caustic Embrittlement) Cavitation Chloride Stress Corrosion Cracking Cooling Water Corrosion Corrosion Fatigue Corrosion Under Insulation (CUI) Cracking Decarburization Embrittlement Erosion Corrosion Fatigue (Material) Graphitization High Temperature Hydrogen Attack (HTHA) Hydrochloric (HCl) Acid Corrosion Hydrofluoric (HF) Acid Corrosion Hydrogen Blistering Hydrogen Embrittlement Hydrogen Induced Cracking (HIC) Hydrogen Stress Cracking Liquid Metal Embrittlement (LME) Metal Dusting Microbiologically Induced Corrosion (MIC) Naphthenic Acid Corrosion (NAC) Phosphoric Acid Corrosion Polythionic Acid Stress Corrosion Cracking (PASCC) Spheroidization (Softening) Stress Assisted Corrosion Sulfidation Corrosion Sulfuric Acid Corrosion Thermal Fatigue Vibration-Induced Fatigue Wet H2S Damage
Articles about Stress-Oriented Hydrogen Induced Cracking (SOHIC)

    Inspectioneering Journal

    Explore over 20 years of articles written by our team of subject matter experts.

    Company Directory

    Find relevant products, services, and technologies.

    Job Postings

    Discover job opportunities that match your skillset.

    Case Studies

    Learn from the experience of others in the industry.

    Event Calendar

    Find upcoming conferences, training sessions, online events, and more.

    Industry News

    Stay up-to-date with the latest inspection and asset integrity management news.

    Blog

    Read short articles and insights authored by industry experts.

    Acronyms

    Commonly used asset integrity management and inspection acronyms.

    Downloads

    Downloadable eBooks, Asset Intelligence Reports, checklists, white papers, and more.

    Videos

    Watch educational and informative videos directly related to your profession.

    Expert Interviews

    Inspectioneering's archive of interviews with industry subject matter experts.