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Re: [MW:32048] Alignment tolerance for ASME B 31.3 Piping pipe to pipe fit up and pipe to fitting

By Materials & Welding

1) Root Gap Tolerance is an non-essential variable and shall; comply with the WPS. Normal Root Gap used is 2.4mm +/- 0.8mm and it depends on factors like Thickness, size of Filler wire used for root pass, welder's skill and no restriction as per ASME B 31.3.

2. Offset or misalignment as per WPS as specified in the client specification and B31.3 only recommends for Tapering for unequal thicknesses or diameter.

3. Bevel angle for steel as recommended below but may vary for Materials based on their thermal conductivity

Inline image

ASME B31.3 normally references ASME B16.25 for bevels

Thanks & Regards

J.Gerald Jayakumar




On Friday, 12 March, 2021, 08:50:13 am IST, Chaudhary Zafar Iqbal <chzaiqbal88@gmail.com> wrote:


Dears 
can you please refer to code for the tolerasnce of root gap between pipe to pipe and offset (misalignment ) during fit up stage to verify in order to release fior welding .


         Description                                                   ASME B31.3 reference  
1) Root Gap tolerance    
2) Offset (misalignment ) tolerance 
3) Bevel angle tolerance 

Best Regards,
Ch zafar Iqbal 
00966544639978    

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