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[MW:1453] Re: Radiography Test : FULL Vs 100%

By Materials & Welding

When  "100 % RT" OR "Full RT" is specified in data sheet, is it require to perform the radiography of category D joints (nozzle to shell joint) ?

Regards,

Santosh




"Prabhakar h" <hb.prabhakar@gmail.com>
Sent by: materials-welding@googlegroups.com

01/10/2009 05:41 PM
Please respond to materials-welding

       
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        Subject:        [MW:1443] Re: Radiography Test : FULL Vs 100%



Yes.. I agree with the below answer..
 
To add it further..
 
Let us consider a cylinder on a vessel for a certain length and it has 4 Cir. Seams and 4 Long. seams.
 
If the vessel calls for FULL radiography, then a spot ( i repeat a spot, means not Spot radiography, it is aportion, say 100 to 200mm ) on all the 4 cir seams, 4 long. seams have to be radiographed and all the T joints have to be Radiographed.
 
If the vessel calls for 100% radiography, then the entire length of the Butt joint welds have to be radiographed (thro full length).
 
Regards,
Prabhakar.H
On Fri, Jan 9, 2009 at 10:47 AM, Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com> wrote:
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%

 

Dear Bathula,

 

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.

 

On 1/8/09, Bathula Raghuram (Mumbai - PIPING) <r.bathula@ticb.com> wrote:
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).

From: Pressure_Vessel@yahoogroups.com [mailto:Pressure_Vessel@yahoogroups.com] On Behalf Of edfarman chan
Sent: Thursday, January 08, 2009 4:45 PM
To: Pressure_Vessel@yahoogroups.com
Subject: [Pressure Vessel] Radiography Test : FULL Vs 100%

 
Dears,

 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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