Weld neck flange weld to pipe dummy question

[mariolucas75]

Dear All,

I have a dummy question ....

What are the references for welding a weld neck flange to pipe - in terms to what NDT to be done and where and when?
Root pas ? subsequent passes ? What is the NDE requirements depending of fluid service ?
Code of construction is B31.3

 

[LittleInch]

B31.3 is its own code for welding and inspection, i.e. it's all in there if you look carefully.

 

[mariolucas75]

Littleinch ... please ... approaching you modestly....
To more narrow your direction ... paragraph chapter ....

 

[LittleInch]

Try chapter V or just look in the index....

 

[mariolucas75]

I ve gone through B31.3 Sections V and VI - for example

341.4.1 Examination — Normal Fluid Service:
"At least 5% of circumferential butt and miter
groove welds within each designated lot shall be subjected
to random examination by radiography in accordance
with para. 344.5 or by ultrasonic examination in accor-
dance with para. 344.6.

344.6 Ultrasonic examination - for sizes >DN 50 (>NPS 2) and ≤DN 450 (≤NPS18), once in each 1.5 m (5 ft) of welding examined

also it says at other place some particular percentage of total welds etc etc ... but in this particular case there is one 18" weld neck flange-pipe weld, also i could not find if there is anything about extent of NDE depending on number of beads .... ? P.S. No RT is available - only UT or MPI can be done...

 

[Snickster]

Would not welding of a flange to pipe be no different from welding a circumferential pipe joint? I don't recall weld of WN flanges to pipe being treated differently.