Inspectioneering

Integripedia Topic
Carbonate Stress Corrosion Cracking

Explore this topic

Carbonate Stress Corrosion Cracking (ACSCC) is a common problem in the oil and gas production, petroleum refining, and petrochemical/chemical processing industries. ACSCC is a form of alkaline stress corrosion cracking that often occurs more aggressively at higher pH and high concentrations of carbonate solutions. It’s very tricky to deal with since only very low levels of residual stress are required for carbonate cracking to occur.

ACSCC appears frequently in some refinery cat crackers, especially in fractionator and gas processing overheads. Likewise, some gas scrubbing units are also susceptible to the mechanism.

One of the more unusual characteristics of ACSCC compared to other damage mechanisms is that it often extends out several inches away from the welds and is not just a phenomena in heat affected zones. In fact, carbonate cracking usually consists of multiple, tight, fine, parallel cracks and is often described as looking like a spider web. For this reason, it is often difficult to detect without careful surface preparation and wet fluorescent magnetic particle testing methods. ACSCC can also be tested for via other methods such as shear wave ultrasonic testing, acoustic emission testing, and radiographic testing, although these tend to be less effective than WFMPT. Visual examinations can be used as well, but these tend to be ineffective except in more advanced cases.

When done properly, post weld heat treatment is an effective way to prevent ACSCC. In situations where post weld heat treatments are ineffective, barrier coatings are also an adequate method of prevention.

Topic Tools

Share this Topic

Contribute to Definition

We welcome updates to this Integripedia definition from the Inspectioneering community. Click the link below to submit any recommended changes for Inspectioneering's team of editors to review.

Contribute to Definition
Articles about Carbonate Stress Corrosion Cracking
November/December 2003 Inspectioneering Journal

Carbonate cracking (CC) of carbon steel has seen an increase recently in frequency and severity in some refinery cat crackers, especially in fractionator and gas processing overheads. Some gas scrubbing units are also susceptible. CC is a form of...

Authors: John Reynolds
Partner Content

It’s a scary thought to think that with all the new advancements in technology, some facilities still rely on traditional inspection contractors that perform out of date procedures. You rely on technology to keep your home and identity safe, so...

    Downloads & Resources related to Carbonate Stress Corrosion Cracking
      News related to Carbonate Stress Corrosion Cracking

        Inspectioneering Journal

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

        Company Directory

        Find relevant products, services, and technologies.

        Talent Solutions

        Discover job opportunities that match your skillset.

        Case Studies

        Learn from the experience of others in the industry.

        Integripedia

        Inspectioneering's index of mechanical integrity topics – built by you.

        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.

        Expert Interviews

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

        Event Calendar

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

        Downloads

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

        Videos

        Watch educational and informative videos directly related to your profession.

        Acronyms

        Commonly used asset integrity management and inspection acronyms.