[MW:2613] RE: 2611] Use of LTCS Material lower temperature than allowed in code

Prasad,

It is true that The A333 gr. 6 material can be used at temperature at
-60 Deg C. with impact testing the base material at -60 deg C. But this
is an additional testing requirement addition to standard impact testing
temperature as specified in ASTM A333 . Which will lead to cost and
delivery impact.

Rather It is not required to additionally impact test the material for
use at -60 deg.C if the Note 3 of Table 323.2.2 , which states the
material can be use till -104 Deg C if the Stress ratio defined in Fig.
323.2.2B does not exceeds 0.3.

Makarand if you colud calculate and confirm that your stress ratio is
less than 0.3, then ASME 31.3 allows you to use A333 material below -50
degC.

Kind regards

Rahul Pisat
Material Engineer

Aker Process B.V.
* PO Box 5254, 2701 GG Zoetermeer, The Netherlands
H Houtsingel 5, 2719 EA Zoetermeer, The Netherlands
* +31 (0)79 368 8688
7 +31 (0)79 368 8555
Registered with the trade register of the Chamber of Commerce in Den
Haag, The Netherlands, No. 27081325

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Prasad Joshi
Sent: Wednesday, July 01, 2009 12:45 PM
To: materials-welding@googlegroups.com
Subject: [MW:2611] Use of LTCS Material lower temperature than allowed
in code

Dear all,

may be useful for the group members.

With best regards,

Prasad Joshi
> ----- Forwarded by Prasad Joshi/TPGAUH on 01/07/09 10:39 AM -----
> 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
>
>
>
>
>
>
> 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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