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- since 1996 -
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Technical Discussions
Dhiliban
Other, QA/QC engineer
L&T HCP, India, Joined May 2016, 16

Dhiliban

Other, QA/QC engineer
L&T HCP,
India,
Joined May 2016
16
10:11 May-31-2016
RT technique for

We have welded an Sweepolet with a 24inch dia pipe,i want to do RT for the joint,there is no access to place the flim inside since the pipeline is completed.

What technique should i use to get the maximum possible flim sensitivity

 
 Reply 
 
Amritpal Singh
Engineering, ASNT Level III RT, UT, MT, PT, VT
JGC, Japan, Joined Jun 2013, 32

Amritpal Singh

Engineering, ASNT Level III RT, UT, MT, PT, VT
JGC,
Japan,
Joined Jun 2013
32
10:28 May-31-2016
Re: RT technique for
In Reply to Dhiliban at 10:11 May-31-2016 (Opening).

What about the DWSI tech. Is it not possible?

 
 Reply 
 
Dhiliban
Other, QA/QC engineer
L&T HCP, India, Joined May 2016, 16

Dhiliban

Other, QA/QC engineer
L&T HCP,
India,
Joined May 2016
16
19:07 May-31-2016
Re: RT technique for
In Reply to Amritpal Singh at 10:28 May-31-2016 .

Thanks for your reply

Currently we tried DWSI but the contrast is low and unable to define the indications

 
 Reply 
 
N B Rengaraju
NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA., India, Joined Sep 2014, 106

N B Rengaraju

NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA.,
India,
Joined Sep 2014
106
10:21 Jun-01-2016
Re: RT technique for
In Reply to Dhiliban at 19:07 May-31-2016 .

You can try using a more slow or ultra fine grain film than the one which you have used so far. Also, see if back-scattering effect is their in the location and try to reduce the same with lead sheets behind the film cassette.

 
 Reply 
 
J Wallis
NDT Inspector, -
Netherlands, Joined Feb 2010, 626

J Wallis

NDT Inspector, -
Netherlands,
Joined Feb 2010
626
18:14 Jun-01-2016
Re: RT technique for
In Reply to Dhiliban at 19:07 May-31-2016 .

I don't understand why DWSI produces unnacceptable results. The technique is really just the same as radiographing a butt weld. Are you placing the film in direct contact with the weld or is there some sort of increased objet - film distance? What is the wall thickness of the 24"pipe, maybe this is excessive.

 
 Reply 
 
Dhiliban
Other, QA/QC engineer
L&T HCP, India, Joined May 2016, 16

Dhiliban

Other, QA/QC engineer
L&T HCP,
India,
Joined May 2016
16
10:16 Jun-02-2016
Re: RT technique for
In Reply to J Wallis at 18:14 Jun-01-2016 .

Yes Mr.J Wallis,as you said the object to flim distance is 100mm,since the penumbera is masking the observations in the weld area,

Behalf of the gemorty of the component we are not able to place the film in contact with weld

 
 Reply 
 
Amritpal Singh
Engineering, ASNT Level III RT, UT, MT, PT, VT
JGC, Japan, Joined Jun 2013, 32

Amritpal Singh

Engineering, ASNT Level III RT, UT, MT, PT, VT
JGC,
Japan,
Joined Jun 2013
32
12:22 Jun-02-2016
Re: RT technique for
In Reply to Dhiliban at 10:16 Jun-02-2016 .

Please post the photo of the object

 
 Reply 
 
shane feder
, Quality Co-ordinator (SubSea)
Thailand, Joined Dec 2014, 89

shane feder

, Quality Co-ordinator (SubSea)
Thailand,
Joined Dec 2014
89
01:47 Jun-03-2016
Re: RT technique for
In Reply to Amritpal Singh at 12:22 Jun-02-2016 .

I also would be interested in a photo.
I have recently completed a project (Sub-sea manifolds) and we had approx. 80 sweepolets ranging from 10" to 36" with no problem performing RT on any of them.
Regards,
Shane

 
 Reply 
 

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