Re: [MW:5400] spec DEP 31.38.01.31

Hi,

           This requirement is not mandatory and applicable for the below cases

1. For Carbon steel Dia 2" (DN-50) and less the welding(all passess) shall be TIG welding

2. For stainless steel piping without back welding of the internal side, the root pass

shall be carried out by the GTAW process with an inert gas purge which shall be

maintained until completion of the second pass. 





(wherever you can not make sound weld (back chipping/back gouging)on root side it's mandatory to go for GTAW root welding.

For stainless steel piping without back welding of the internal side, the root pass

shall be carried out by the GTAW process with an inert gas purge which shall be

maintained until completion of the second pass.

vaithiyanathan,

On Fri, Jun 4, 2010 at 1:27 PM, nixon joseph <nixonjosephq@rediffmail.com> wrote:

Hi

As per shell spec DEP 31.38.01.31 for shop fabrication TIG for root welding is a compulsary requirement?

Regards

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With Best Regards

B.Vaithiyanathan

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