Hi Rakesh
try googling "sulphide stress corrosion cracking" and you will get some useful leads
Cheers
Steve
-----Original Message-----
From: Michael Waugh [mailto:mike@waudesign.com]
Sent: Friday, May 14, 2004 3:31 PM
To: PipingDesign@yahoogroups.com
Subject: RE: [PipingDesign] Cracking [text][bcc][faked-from][bayes]
Rakeesh:
It has been some time since I visited this subject, but I'll stick my neck out anyhow. Hydrogen Induced Cracking (HIC) and Sulphur Induced Cracking are a result the formation of hydrogen ions formed through various means in the material. Hydrogen ions will react with the material, I believe causing the formation of various acids, metal oxides and sulphates etc. The chemistry here is quite vast but are largely dependent on the many conditions, heat, water, steam, pH etc that you encounter in processes. Relatively speaking, you cannot prevent it from occurring, it will occur. You can only go to higher cost materials, lined piping, anticorrosion devices to reduce the likelyhood of it causing failures in your processes.
Mike
-----Original Message-----
From: Rakesh Patil [mailto:rpa@lntenc.com]
Sent: Thursday, May 13, 2004 10:59 PM
To: PipingDesign@yahoogroups.com
Subject: RE: [PipingDesign] Cracking [text][bcc][faked-from][bayes]
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: PipingDesign@yahoogroups.com
Cc: PipingDesign@yahoogroups.com
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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