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Re: [MW:33796] Distance b/w branch weld and pipe seem weld

By Materials & Welding

Dear Mahmood,

          There is no clear quote for minimum weld distance length in ASME B31.1 Power piping standards, where there is minor guidance provided for a few locations as mentioned below:

1.    131 WELDING PREHEAT:


2.    Figure 104.3.1-1 Reinforcement of Branch Connections (Cont'd)


3. Table D-1 Flexibility and Stress Intensification Factors (Cont'd)


General Note: In the cross-country pipeline, to maintain a minimum weld distance length is so difficult in a position of mitre elbow. Your weld should have integrity as mentioned in the specs. Use any type of NDE.

Olets fittings welds shall be carried out by the approved WPS. If there is no condition mentioned in your contract. You can waive it. 


Thanks,

Kind Regards,

G.Gughan


On Thu, Dec 1, 2022 at 12:10 PM Ritesh Kumar Singh <riteshsiwan770@gmail.com> wrote:
Depends on code and specifications as I remember in B31.3 it is  5T( wall thickness of pipe*5).


On Thu, 1 Dec 2022, 8:48 AM Yunsok Bang <stevebang87@gmail.com> wrote:
Hello.


This link will help your question.

In my work place follow the BS code. The 4t(nominal pipe thickness).

Have a good day.

On Wed, Nov 30, 2022 at 2:42 PM Mahmood Al-Hinai <hyna4444@gmail.com> wrote:
Experts,

What is the requirement for the distace between branch weld and pipe seem weld. 
Is the condition in attached photo accepted or not?
Pls advise

Thanks
Mahmood

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