RT for welding pipe to flange

[Mohamedhassanmido]

Can I do RT test after welding pipe to flange 30 inch diameter? If yes what is the procedure and method?

 

[DekDee]

Panoramic with "Rollpac" film - one shot, one film only required.
Cheers,
DD

 

[racookpe1978]

what kind of weld?

Fillet as for a slip-on flange, butt weld?

 

[DekDee]

racookpe,
How do you RT a fillet weld (especially on a slip on flange) ?
Regards,
DD

 

[weldstan]

DekDee,
You would be surprised what some customers want; defies logic and the imagination.

 

[racookpe1978]

DekDee - "How do you RT a fillet weld?"

That was the purpose of my question. But if it were a butt weld, he would be using a 30 inch dia RFWN, and I didn't want to make that assumption.

 

[Mohamedhassanmido]

Slip on flange

 

[muld0020]

Are you working to a CODE? If you are strictly working to ASME Sec VIII D1 for a pressure vessel, then Refer to Fig UW-3 and UW-12. If you have a slip-on flange it is a Cat C and RT is not applicable (not required) even if the whole vessel calls out for a degree of examination. If you need to do RT (customer or service driven) then UT can probably be substituted, but you need to look at your situation if a slip-on would even be allowed.

 

[DekDee]

racookpe,
My apologies.

weldstan,
Understood, thank you.

mohammedhassanmido,
I am lost for words !!! (I have a few but might get in trouble)

 

[ndeguy]

Slip-on flange should not require RT or UT because of the geometry being unfavourable to both. Surface crack detection (MPI for carbon steel, penetrant for stainless) shouls suffice.

 

[OSIRIS7]

If RT is not possible on a weld, you might want to check if TOFD (Time-of-Flight Diffraction) can help. This is a type of ultrasonic testing, but you can visualize the defects and also "around the corner".

 

[DekDee]

OSIRIS7,
It is still a fillet weld (or two of them)- TOFD or manual UT is still pretty much useless on a fillet weld.
What are you actually looking for in your UT scan ?
Weldstan described it perfectly !
Regards,
DD

 

[OSIRIS7]

TOFD is an evolved UT. If I am correctly informed, you can look for defects in a fillet weld.

 

[weldstan]

OSIRIS7,
Whereas slip on flanges are used in low pressure applications and the fillet welds are likely small, TOFD will not provide any valuable information.