From: Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com>
Subject: [MW:1440] Radiography Test : FULL Vs 100%
To: materials-welding@googlegroups.com
Cc: Pressure_Vessel@yahoogroups.com
Date: Friday, January 9, 2009, 10:47 AM
Yes, it is true that in case of vessels designed as per ULT all butt welds are subjected to 100% RT (note that name plate marking will also be RT1 in this case and in addition ULT under U stamping will marked to distinguish)
However in case of UCS the term Full is meant as defined in UW11 and marked as RT-1 on nameplate, as I said it is up to designer to specify/define 100%RT along with a note on the datasheet.
In case of div 2 the 2007 Ed specifies in terms of % only for each type if joint (refer table 7.2)
I will try to compile and post the complete data on joint efficiency and RT markings as and when time permits (if any body have pressure points published in year 2001 or 2002, you may share. There was a clear explanation on this issue)
From: Pressure_Vessel@yahoogroups.com [mailto: Pressure_Vessel@yahoogroups.com ] On Behalf Of edfarman chan
Sent: Thursday, January 08, 2009 5:59 PM
To: Pressure_Vessel@yahoogroups.com
Subject: Re: [Pressure Vessel] Radiography Test : FULL Vs 100%
Actually ASME VIII-1 also specify the term of 100% radiography.
I found this wording some in ASME, for example:
<AA> Part UW Reqr't for PV Fabri'd by Weldings
UW-52, see at the last sentence of note.
100% RT shall be applied while the previous spot result radiographically disclosed welds defects must be eliminated.
<BB> Part ULW,
See section ULT-57 Examination, all butt joints shall be examined by 100% radiography (for me it means UW-11) except as permitted by UW-11 (a) (7) (for me that means UT instead of Full or 100% RT).
Re to your response, it look like both of "100% RT" and "Full RT" have a different meaning.
If yes, then I believe, ASME should specify the detail terminology of 100% RT at least at the same way of this code specified Full RT at section UW-11.
Unfortunaltely so far I can't find it. (That what i'm asking for in my query mail below).
Refer to the above references, in my humble opinion this 100% RT should be the same meaning of Full RT.
However thank for your response and please have futher discussion if don't mind.
No such requirement as 100% in ASME Sec VIII div1, you may refer UW11 for Full RT requirements. Here there are some joints exmpted from RT even you specify as FULL. It depends on designers specific requirements, whether to apply 100% or Full. In my opinion if the datasheet specifies 100% all buttwelds shall be RT'ed irrespective of exmeptions given in UW11(a).
Does "Full RT" and "100% RT" has the same meaning of Radiography Test?
If NOT - which section of ASME Sect. VIII Div.1 (or 2 or 3) that describe in detail description for both "Full RT" and "100% RT"?
Thanks & Regards,
edfarman
Regards,
edf
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