[MW:1194] RE: 1193] Re: Radiography of tube to tube sheet welds

Of course we are not discussing for butt welds, any way we have conventional methods to perform RT of but welded (inner bore) tube to tube sheet joints.

 

Infact I was looking for a good (improved) technique, equipment for the normal tube to tube sheet weld. No doubt the posting from Mr..Raghavendra and Agrawal will clear my query to some extent.

 

I was looking for customized equipment for this type of welds. if any body has details about the manufacturers, please share

 

Thanks!

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]On Behalf Of Tirumala B N Tagore
Sent: Thursday, October 09, 2008 8:55 AM
To: materials-welding@googlegroups.com
Subject: [MW:1193] Re: Radiography of tube to tubesheet welds

the detail shown is not applicable to examine butt welded type weld.

for your info.

regards,

tagore

On Tue, Oct 7, 2008 at 9:23 AM, Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com> wrote:

-----Original Message-----
From: PEMMARAJU RAGHAVENDRA [mailto:rpe@hzw.ltindia.com]
Sent: Tuesday, October 07, 2008 5:30 AM
To: Bathula Raghuram (Mumbai - PIPING)
Subject: Re: [MW:1177] Radiography of tube to tubesheet welds


We have done extensive RT of such joints in the past.
We have adopted the back radiation technique in which the source shall be moving from the front side of the joint. We have used the roli camera without guide tube and only the cranking unit wire coupled with source pigtail shall be used.The film used was of AGFA D4 with a special type of cassette with a hole at the centre.Vide this hole on the film cassette, the source enters into its position in case of back radiation technique.
It is preferred to use low curie source of Ir-192 of the order 3 to 4Ci.
Refer the attached word file for the source and film setup.

Instead of Gamma rays, you may use micro-focus X ray machine with hooded anode target which was developed by Sasol.


regards,
RPE


Larsen & Toubro Limited
www.larsentoubro.com


From: Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com>
Subject: [MW:1177] Radiography of tube to tubesheet welds
To: "Materials-Welding (E-mail)" <materials-welding@googlegroups.com>
Date: Wednesday, 1 October, 2008, 1:48 PM

Can anybody has experience with performance of RT on tube to tubesheet welds,
please share details for both techniques (i.e. back radiation and forward
radiation), equipment literature if any for this type RT.


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