Radiography
Radiography
(OP)
Can I know what is the difference between Full radiography and 100% radiography?
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RE: Radiography
Full radiography, Per ASME Section VIII, Div 1 (UW-11 and 12)is the more common term.
RE: Radiography
RE: Radiography
And "100% RT" adds 100% of the circ. welds, versus the 'spot RT' of "Full RT".
RE: Radiography
Rgards,
Mike
RE: Radiography
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
Full Radiography
ASME VIII-1 has two meanings for full radiography:
- RT-1: Full radiography of all long and all circ seams, but with some exceptions (eg: nozzles and communicating chambers not larger than NPS10)
- 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
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
RE: Radiography
RE: Radiography