sorry for late reply ....this is a catalyst plant - running full year
(with the same conditions in my query) . I will get you the design
conditions & actual process..
On 10/21/10, pgoswami <pgoswami@quickclic.net> wrote:
> Hi Mayank,
>
> The design environment operating conditions are way too much of austenitic
> stainless steel. That's why Alloy 80 selected. If you could forward some
> more information on the operating environment, the extent of cyclic services
> (all round the year or only a temporary phenomenon), design conditions of
> the equipments etc, more relevant answers to your query could be found.
>
> Thanks
>
> Pradip Goswami,P.Eng.
> Welding & Metallurgical Specialist & Consultant
> Email-pgoswami@sympatico.ca,
> pgoswami@quickclic.net
>
> -----Original Message-----
> From: materials-welding@googlegroups.com [
> <mailto:materials-welding@googlegroups.com>
> mailto:materials-welding@googlegroups.com] On Behalf Of Mayank .
> Sent: Friday, October 15, 2010 10:00 AM
> To: materials-welding
> Subject: [MW:7585] Cyclic Thermal Loading material Selection 800H / 316H
> /304H -Regarding
>
> Dear
>
> We have situation where in - - due to process conditions the equipment has
> cyclic loading more or less of the below cycle
>
>
> H2 @ 700 Deg C - two- three days - N2 @710DegC - two-three days -
> Co2+N2@ 200DegC one day .
>
> Proposal was to use 800H material initially (reason for Selection of
> Material not known ) in the last stage , we came to know that existing plant
> has one 304H which is working fine .
>
> I referred NACE for guidance - it indicates 316 as good material for H2S
> materials in high temperatures but couldnt find the N2 & Co2 +N2 part . Some
> say 316 stabilised ...
>
> ASM Metals hand book (quite scared me ...coz few case studies have failures
> within Days if not in Weeks & Months ) referred API 941 . (I dont have a
> copy , does this Standard have any recommendation of material for the
> above??? )
>
> -recommendations go on...........
>
> anybody has experience of the same / somewhat close cycles in their
> Process Plant? -
>
> Any path forward will help a lot ...
>
> ---------------------
> HAPPY DUSSERA !
>
> Regards
>
> --
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