×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Radiography

Radiography

Radiography

(OP)
Can I know what is the difference between Full radiography and 100% radiography?

RE: Radiography

They are one in the same.

Full radiography, Per ASME Section VIII, Div 1 (UW-11 and 12)is the more common term.

RE: Radiography

(OP)
Oh i see. I was told by that for full radiography is only for butt weld that exceed certain thickness. However for 100%, means all the butt weld need to be radiograph no matter what is the thickness . I read UW-11 and 12 but 100% was no mention. so i am abit lost .

RE: Radiography

Sorry, but they are NOT the same. Under ASME "Full Radiography" usually entails 100% of all longitudinal seams and all long. to circumferential seam junctions; BUT only requires 'spot RT' of the circ. seams. And all of these seams are full-penn butt welds. See VIII Div-1 QW-51.

And "100% RT" adds 100% of the circ. welds, versus the 'spot RT' of "Full RT".

RE: Radiography

For Sec VIII, Div 1 work 100% RT is generally taken to mean that the exemptions of UW-11(a)(4) for Cat B & C welds are not taken, these are RT'd. This can vary by organization however. Best to ask the question.


Rgards,

Mike

RE: Radiography

I agree with Duwe6,
Both Full and 100% (and Spot) are noted in ASME VIII whereas the B31 piping codes reference 100%, Random or Spot radiography,
Cheers,
DD

RE: Radiography

DekDee, I think it goes a little bit beyond that. The difference you mention is between RT-1 and RT-2. Following is my interpretation.

Full Radiography

ASME VIII-1 has two meanings for full radiography:
  1. RT-1: Full radiography of all long and all circ seams, but with some exceptions (eg: nozzles and communicating chambers not larger than NPS10)
  2. RT-2: Full radiography of all long seams, but spot radiography on circ seams, but with the same exceptions above (eg: nozzles and communicating chambers not larger than NPS10)
So, it can be called full radiography in either case, but you are still leaving out some welds (small nozzles for example)

100% Radiography
Some customers for some applications require absolutely every butt weld to be radiographed, not allowing for any of the exceptions allowed by ASME VIII-1 for full radiography. For 100% radiography I would be performing radiography even on those little NPS2 pipe to RFWN nozzle welds.


Just my opinion... I'm sure others read this differently. Normally when I see 100%, I confirm whether they actually meant full radiography as defined by ASME as either RT-1 or RT-2. If they actually mean 100%, they'll reiterate it.

Marty

RE: Radiography

marty,
I have mentioned no differences - just agreed with Duwe6.
The most basic answer to the OP is if "Full" radiography is required everything noted in UW 11 must be radiographed.
If 100% radiography is required all butt welds nominated for "spot" radiography must be radiographed 100%.
If nozzles are not nominated for any radiography at all I can see nothing in ASME VIII requiring it.
The only reference I can find to 100% radiography is in UW-52 Spot Radiography,
Regards,
DD

RE: Radiography

(OP)
Thanks All.

RE: Radiography

100% RT and full RT are the same terms. how it is applied and required by Code or to customer's specifications or requirements are different cases.

RE: Radiography

Marty hit it on the nose.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources