I'll stick my neck out also, for what it's worth.
Talk to the people that know how molecules work.
Paul
> 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: <a href="/group/PipingDesign/post?postID=fwGgXggJBUa4trtFn7nnZuN1p6l19sPuH1s80yvORRGLfSRENPPcNVKXod01zbUmEPNKU55KGUTQl8fFcmWsvvl3I3cSvA">PipingDesign@yahoogroups.com</a>
> 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
Received on Thu May 13 23:50:00 2004
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