Your were right.
Assuming your service to be B31.3, A234 Gr.WPB will be a material classified under curve B of Fig.323.2.2 A of ASME B31.3
Looking at your service condition (Design minimum -45 Deg.) this material cannot be used for the said service.
You need to use A 420 WPL6 for your service.
Regards,
A.Praveen
Welding Engineer
Muscat
--- On Tue, 1/25/11, thiru sam <thiruvenkatam_be@yahoo.co.in> wrote:
> From: thiru sam <thiruvenkatam_be@yahoo.co.in>
> Subject: [MW:9459] Use of A 234 WPB in the place of A420 Gr.WPL6
> To: "Materials & Welding" <materials-welding@googlegroups.com>
> Date: Tuesday, January 25, 2011, 7:16 PM
> Dear All,
>
> Can somebody advice me about the use of A234 WPB
> fittings in the
> place of A420 Gr.WPL6 for the LPG line.
>
> I hope,A234 WPB is for medium and elevated
> temperatures,whereas A420
> is for lower operating temperatures. and moreover A420 is
> having
> impact test properties.
>
> So i hope we cant use the A234 WPB in place of A420,even
> though
> tensile properties are same.
>
> In my project,Design Temperature of LPG line is -45 deg to
> +85 deg.
>
> Is my statement is correct?
>
>
> Regards,
>
>
> Thiru.
>
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