NDE percent

[fazel1]

most of the codes such as ASME secI have cleared that the NDE shall be done on the "entire" weld.but in ASME B31.1 I couldn't find this word. so what shall we do about this?
does this mean that we can choose the percent for it or not?

 

[eyec]

what i have seen and believe to be a good practice (in general) is a sliding percentage, i.e.

xray 10% of each welders welds, if 10% fail then an additional 20% should be xrayed, if you still get failed welds then 100% xray would be implemented.

however, after the first set of failed welds the particular welder would be disqualified and the process started over with the new welder.

 

[lostsailor]

fazel1,
From an inspectors point of view, when I see a reference that a weld is to be subjected to NDE, unless otherwise specified, I assume 100% coverage. This would be the safest route to take. Discuss it with your inspector, if you have one, or your customer/end user.
Regards,
RLS

 

[GenB]

Keep looking in B31.1, it must be a table similar to sec I or VIII-1, I do not have the Code w/me so i can not answer.
any one from power pipiping should answer your question.

I see theat the last 2 posts do not address the Code, but opinions.
er

 

[lostsailor]

fazel1,
Now that I'm next to my codebooks, paragraph 136.4.1 and Table 136.4 of Chapter VI of the 1998 Edition of B31.1 addresses required NDE.
Regards,
RLS

 

[stanweld]

Per B31.1 NDE other than Visual is either 100% or nothing depending on Temperature/Pressure considerations as defined in Chapter VI.

 

[eyec]

remember the Codes are minimum requirements.

sometimes best practices are overlooked.

but the main consideration is what the AI wants to see.