Dear Lakshmi V Narayana
CSLT is the most popular selection. Yes anhydrous
ammonia cause SCC in Carbon steels, but the
precautions like inhibition using distilled water
added upto 0.2 % makes CS SCC resistant to Ammonia
service. Another precaution is to reduce the residual
stress by PWHT of welds and the cold formed components
of the handling system. Slight over design (reduced
component stress) may give you relief from stress
cracking.
Hope it solves the problem faced by you.
Narendra K Roy
Gramya Research
- "Lakshmi V. Narayana" <LNarayana@safco.net> wrote:
> Dear friends,
>
> We are facing SCC problem since long time. The
> service is anhydrous liquid
> ammonia and material of construction is LTCS. We
> observed leaks in weldments
> due to SCC as Liquid NH3 is contaminated with CO2.
> SS material can be
> replaced.however cost will be more. Can SCC be
> mitigated by doing stress
> relieving of all joints. What about small bore
> lines. My suggestion is to
> replace all small bore line SS304L and all bog bore
> lines shall be stress
> relieved. Can any body share his experience in this
> regard.
>
> Regards
> LAKSHMI NARAYANA
> MECHANICAL ENGINEER(FERTILIZERS)
>
>
>
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Received on Sun Dec 07 21:23:00 2003