RE: Cracking [text][bcc][faked-from][bayes]

From: <Rakesh>
Date: Thu May 13 2004 - 22:59:00 EDT

Dear Bruce,

Thanks for your resonse. I have a background of material science. But when I checked HIC from my superiors, I found some controversy. One told me that it happens when hydrocarbon flows in CS pipes due to formation of CH4 which generally occurs at welded joints and results in a crack. whereas another told, it happens when a fluid (hydrocarbon) passing through pipe enters inside the gaps between bonds (metal composition) which forms a crack after certain period.

so can you please suggest me which one is correct? I have not searched for it on net but will do it simultaneously. About Sulphur Cracking, I am not getting anything. can you please suggest me any paper or literature available on the same.

cheers,
rakesh

Rakesh:

This is rather complex and not conducive to an e-mail, unless you want to limit the discussion to "it's bad" and "use the right material for the service to avoid it". I have corrosion and materials texts and took courses on solid-phase chemistry and materials science of corrosion to get a basic understanding. Have you done thorough on-line searches (like Google) to get some basic information? Do you have a background in solid-phase chemistry and material science?

                            ... Bruce D. Bullough ...
                            Sebesta Blomberg & Associates, Inc.
                            2381 Rosegate
                            Roseville, MN  55113       USA
                            + 651-459-6659
                            www.sebesta.com

-----Original Message-----
From: Rakesh Patil [mailto:rpa@lntenc.com] Sent: Wednesday, May 12, 2004 8:44 PM
To: <a href="/group/PipingDesign/post?postID=xQM7hKXzllic-6Q9Q7S04C7OkZ4yXLhMMO3yCk8axZhDEu00wTwb5k7nwsuWm8--ffGlFgaLC_KLUsJO2D98wtNpl6a22SU">PipingDesign@yahoogroups.com</a> Cc: <a href="/group/PipingDesign/post?postID=xQM7hKXzllic-6Q9Q7S04C7OkZ4yXLhMMO3yCk8axZhDEu00wTwb5k7nwsuWm8--ffGlFgaLC_KLUsJO2D98wtNpl6a22SU">PipingDesign@yahoogroups.com</a> Subject: [PipingDesign] Cracking [text][bcc][faked-from][bayes]

Hi All,

Can anybody guide me about Hydrogen Induced Cracking (HIC) and Sulphur Induced Cracking. What is the basic concept of it and How it can be tested and rectified.

regards,
rakesh

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[Non-text portions of this message have been removed] Received on Thu May 13 22:59:00 2004