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Teletest
Teletest Focus+ was the first system to use long-range guided wave ultrasonic testing to detect corrosion in pipelines.
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Technical Discussions
gowrishankar w
R & D, scientist
ISRO, India, Joined Nov 2008, 34

gowrishankar w

R & D, scientist
ISRO,
India,
Joined Nov 2008
34
10:44 May-06-2010
x-ray interpretation

how fast one should interpret a radiograph? eg., weld length of 200mm taken in a film.
is there any speed limit mentioned in any standard?
pl ans

 
 Reply 
 
bob sudharmin
Engineering, Reliability and Integrity Eng
Shell Malaysia Trading, Malaysia, Joined Jan 2008, 54

bob sudharmin

Engineering, Reliability and Integrity Eng
Shell Malaysia Trading,
Malaysia,
Joined Jan 2008
54
14:48 May-06-2010
Re: x-ray interpretation
In Reply to gowrishankar w at 10:44 May-06-2010 (Opening).

what kind of a question is this? Interpretation speed depends on individuals. How fast should a person be able to read a page of the code book? It is subjective, and it entirely depends on comprehension. Personally, it would take me 10 seconds to view the film, 10 minutes to take notes on findings if any, and another 10 minutes to compare it with the acceptance and rejection criteria. If there are no findings, it would require me 10 seconds to finalise the interpretation.

 
 Reply 
 
S.V.Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 787

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
787
14:51 May-06-2010
Re: x-ray interpretation
In Reply to gowrishankar w at 10:44 May-06-2010 (Opening).

There are speed limits for manual ultrasonic testing but to my knowledge, there are so specific standards for speed of radiographic interpretation. If you use a scanner /digitizer and software for detection of features in the radiograph, the process may take a few seconds or less. A well trained and focused radiographer (not tired after a long day work or otherwise distracted) may also match that speed, but is some one claims to be able to interpret a radiograph of 200mm in a fraction of second, I would be really skeptical.

 
 Reply 
 
Fred Raco, Jr.
Consultant,
RNDT, Inc., USA, Joined Jul 2002, 24

Fred Raco, Jr.

Consultant,
RNDT, Inc.,
USA,
Joined Jul 2002
24
14:59 May-06-2010
Re: x-ray interpretation
In Reply to gowrishankar w at 10:44 May-06-2010 (Opening).

There are too many variables to give an absolute answer to this question. If the weld is clean, it only takes a few seconds. If the weld has rejectable defects, it could take some time to make your measurements. The experience level of the person reviewing the film is the most important variable. As an example, we review film on a daily basis from welds that were radiographed the night before. It is not uncommon to look at 30 to 40 pieces of film in 5 minutes if all of the welds are clean. That is around 7 to 10 seconds per film. If the project has welders that are not that experienced, it might take 30 minutes or so to look at 30 to 40 pieces. This is based on my experience level only. I don't expect or want my technicians looking at film that fast. I have been doing this for 30 plus years. To add a little twist to the game, I have seen people ponder over a single piece of film for over 3 hours before making a decision as to the acceptability of an indication.

 
 Reply 
 
gary whitworth
gary whitworth
13:43 May-07-2010
Re: x-ray interpretation
In Reply to Fred Raco, Jr. at 14:59 May-06-2010 .

Depends if you know what you're looking at or not and i imagine you don't. All comes with experience so i suggest you sit with someone who does know and pick their brain (assuming they have one).

 
 Reply 
 
Kamran
Engineering,
United Arab Emirates (UAE), Joined Jun 2009, 21

Kamran

Engineering,
United Arab Emirates (UAE),
Joined Jun 2009
21
14:53 May-07-2010
Re: x-ray interpretation
In Reply to gary whitworth at 13:43 May-07-2010 .

Hi!
speed of interpretating of a radiograph is capibility of interpretor and it is not standerized by any local or international standard.
Twi have specific course for interpratation of radiograph for making ur capibility at a minimum level, but BACKGROUND KNOWLEDGE, Materials study, HAND ON ExPERIENCE are required to be a good interpretor

 
 Reply 
 
Fred Raco, Jr.
Consultant,
RNDT, Inc., USA, Joined Jul 2002, 24

Fred Raco, Jr.

Consultant,
RNDT, Inc.,
USA,
Joined Jul 2002
24
15:00 May-07-2010
Re: x-ray interpretation
In Reply to Kamran at 14:53 May-07-2010 .

This forum is designed to share information. I find Gary Whitworth's comment to be offensive and irritating. A search and review of his previous comments on this forum leaves me wondering why he hasn't been banned from posting.

 
 Reply 
 
Gary Whitworth
Gary Whitworth
15:12 May-07-2010
Re: x-ray interpretation
In Reply to Fred Raco, Jr. at 15:00 May-07-2010 .

Are we not allowed to have a little hearted fun here and there ? If you actually took the time to read what i wrote you would see i said that he should maybe sit with someone that has more experience as just sitting in a classroom does not teach experience.

 
 Reply 
 
ocean
Engineering
China, Joined Feb 2010, 5

ocean

Engineering
China,
Joined Feb 2010
5
16:48 May-07-2010
Re: x-ray interpretation
In Reply to Gary Whitworth at 15:12 May-07-2010 .

one man who want to learn much knowledge should be respected. We can not forget the sign of our studying

 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
17:15 May-07-2010
Re: x-ray interpretation
In Reply to ocean at 16:48 May-07-2010 .

Deat all

Lets maintain perspective and get on with NDT discussions and leave whether the board is a place to display one's sense of humour (or lack of) far behind.

Mr Gowri Shankar, the responsible technician's signature is a valuable asset which s/he should not attach to any document releasing product until s/he is CERTAIN that the adopted position can be defended should it be challenged. This is key.

How would the law look at the technician's responsibilities? - surely along the lines of given the information available to the technician at the time whether its reasonable that other techncians of similar professional standing could arrive at a similar decision or not. Thus due diligence is an important factor and interpretation should be at the interpreter's pace. If, in the opinion of a line supervisor or manager the interpreter is prevaricating unduly then there is case for substitution but not coercion. All my opinion of course.

Fred Raco's 3 hour scenario would benefit from elucidation, often such delay is because the indication in question is being cross-checked by ultrasonics.

 
 Reply 
 
joe
joe
18:35 May-07-2010
Re: x-ray interpretation
In Reply to Nigel Armstrong at 17:15 May-07-2010 .

Nigel can interpret AUT data in less than 10 seconds while reading a book

 
 Reply 
 
Roger Duwe
NDT Inspector, API-510, 570, 653
MISTRAS, USA, Joined Jan 2009, 148

Roger Duwe

NDT Inspector, API-510, 570, 653
MISTRAS,
USA,
Joined Jan 2009
148
18:38 May-07-2010
Re: x-ray interpretation
In Reply to Nigel Armstrong at 17:15 May-07-2010 .

I concur with Mr. Armstrong on the requirement for "Due Dilligence", and that this multi-national web board is a poor place for work-related humor.

Addressing the original question: I have personally seen a Radiographic Interpreter reading film, to grade casting flaws to ASTM. He seldom took over 4 seconds per sheet [illuminated, in-the-viewer time]. He was about 30-years old [thus no eyesight degradation], had been reading casting film for 10 years continously, and had been reading for 3 to 8 radiographers shooting as fast as practical, for several years.

It would have taken me at least 10 times as long to grade this film.

Another consideration is that if one stares at a shadow [which is what a radiograph actually is], you can eventually see almost anything you are expecting/want to see. If the film looks good at first look, and again upon a second look, quit staring at it. It is good, within the limitations of that exposure. The image will never be as sharp and well defined as a photograph. When we verify that the required Image Quality Indicator is visable, and no defects are visable, were are done with the interpretation of that piece of film.

 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
18:40 May-07-2010
Re: x-ray interpretation
In Reply to joe at 18:35 May-07-2010 .

No Joe, you are confusing me Bill Rayner! My eyes were always glued to the screen.

 
 Reply 
 
tj
tj
04:52 May-08-2010
Re: x-ray interpretation
In Reply to gowrishankar w at 10:44 May-06-2010 (Opening).

I've never heard of a speed limit for RT interpretation.....but, I've never seen a radiograph or digital image that I haven't run my eyes over at least twice.

Shame on you Nigel...You know the three hours is spent fending off UT techs asking "Where was that again?" LOL!!

 
 Reply 
 
gowrishankar
R & D, scientist
ISRO, India, Joined Nov 2008, 34

gowrishankar

R & D, scientist
ISRO,
India,
Joined Nov 2008
34
09:07 May-10-2010
Re: x-ray interpretation
In Reply to Roger Duwe at 18:38 May-07-2010 .

Thank you all. i agree with Mr. Roger . Thank you. Thye thing here is, we are following certain speed limit as far as UT is concerned but not with film interpretation.(in my view film interpretation means defect identification,record of the same ,confirming with codes and disposition). i am really surprised by some of the answers that they can see in less than few seconds. Afterall a film cotains mostly a black image(except for high density inclusions) in a black background in film. Considering grainy noise,artifacts,surface undulations intermittently,irregular shape surface marks as well as certain doubtful indications which are, may be very feable appearance etc., will be there. considering all these things how one can complete interpretation in seconds even though very experienced?
I once again thanks to all participants and request them not to treat this as a silly question. I repeat.
regards(.)

 
 Reply 
 

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