As per ASME B 31.3 Para 311.2.6 - Seal welds may be used only to
prevent leakage of threaded joints and shall not be considered as
contributing any strength to the joints.
You can raise the technical quary.
Regards
atul chaturvedi
On Apr 10, 9:16 pm, suresh <atozsur...@gmail.com> wrote:
> we have sour gas pipelines with higher & lower pressure. All the
> pipelines are withHydrotestvents which will be closed afterHydrotest.
>
> For low pressure pipelines we use flanged joint with a Blind flange.
> For high pressure pipe line with flanged connection there is
> intermittent leakages which needs immediate attention even sometimes a
> shut down.
>
> We intend to use a threadolet as vent & will be plugged & seal welded
> afterhydrotest. The problem is with PWHT. As all the lines in Sour
> gas services shall be PWHT.
>
> We want to avoid PWHT of this small fillet joint, Due to the location
> of these joints & difficulty in PWHT. but it is dangerous to leave it
> without PWHT as it may crack due to residual stresses.
>
> Can you suggest any welding procedure & electrode to have this welding
> with reduce hardness HRC 22 Max by which PWHT can be avoided.
>
> Thanks
>
> Suresh
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