But if this is no option, compare wall thicknesses (<14mm) with test temp (-50) and mdmt temp -60, see ASME VIII, UCS-66. Besides if mdmt will be <-48 pwht and impact test is applicable --> as mentioned before
Arjan
Date: Wed, 1 Jul 2009 23:30:21 -0400
Subject: [MW:2610] Re: LTCS piping material for MDMT - 60 °C
From: tagore.tbn@gmail.com
To: materials-welding@googlegroups.com
Yes.
Sa 333 Gr3 materials ( 3 1/2 Ni materials ) or SS materials would be better choice for -60 deg C . But for 3 1/2 Ni steels , PWHT needs to be done and stringent Quality requirements and NDE costs more when compared to simple SS 304 option.
Energy values while using CS materials would be 27J average of 3 specimens preferred.
(This energy value can be based on ASME Sec VIII Div.2 recommendations for lesser thickness )
Tagore
On Wed, Jul 1, 2009 at 11:42 AM, Jivan Dhamane <jivanadhamane@yahoo.co.in> wrote:
From: BR <raghurambathula@gmail.com>
Subject: [MW:2606] LTCS piping material for MDMT - 60 °C
To: "Materials & Welding" <materials-welding@googlegroups.com>
Date: Wednesday, 1 July, 2009, 7:05 PM
Thank you for sharing, but even it is accepted, is it advisable to use
SA 333 Gr6 or better switch to Gr3 what is your opinion?.
What is your experience on energy values when tested at -60 °C. are
they consistent?
I have many failures, in particular sub size specimens when tested for
< - 60 °C.
On Jul 1, 10:39 am, pjo...@technip.com wrote:
> Dear all,
>
> may be useful for the group members.
>
> With best regards,
>
> Prasad Joshi
>
> PIPING
>
> --------------------------------------------------------------------------- --------------------------------------------------------------------------- --------------------------------------------------------------------------- --------------------------------------------------------------------------- -------------------------------------------------------------------
> >
> ----- Forwarded by Prasad Joshi/TPGAUH on 01/07/09 10:39 AM -----
>
> Prasad
> Joshi/TPGAUH
> To
> 01/07/09 10:23 AM "Ingale, Makarand"
> <Makarand.Ing...@petrofac.com>@TECH
> NIP-EXT
> cc
>
> Subject
> Re: Help(Document link: Prasad
> Joshi)
>
> Dear Makarand
>
> Coming to your query, as per ASME B31.3 ASTM A 333/6 can be used below
> -45.5-deg. C (-50-deg. F as allowed by code without any special
> precautions) with following precautions:
>
> 1) Testing of Base metal at minimum design temperature (-60 deg C in your
> case.) as per B-3 of table 323.2.2 of B31.3. This is useful for the
> procurement part.
> 2) For fabrication and welding part, special precaution has to be specified
> for impact testing of Weld metal and HAZ. This is useful for specifying in
> the welding specification or construction specification. You will have to
> specially mention this in the p.class so that it will be highlighted to
> QA/QC or welding engineer.
>
> I hope this clarifies. Let me know if you need any further information.
>
> With best regards,
>
> Prasad Joshi
>
> PIPING
> "Ingale,
> Makarand"
> <Makarand.Ingale@ To
> petrofac.com> <pjo...@technip.com>
> cc
> 01/07/09 09:40 AM
> Subject
> Help
>
> Dear Prasad,
> I need your help. Can we use Material A333 Gr.6 for temp. Bellow -46 deg.C.
> If yes then what backup document I should refer to prove it. I remember we
> have used this material upto -60 Deg. C, but I don't have any backup
> document to prove it. . if you have anything can you forward me.
> -Makarand.
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