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Technical Discussions
Masaru Kuwahara
Engineering,
Japan, Joined Jul 2020, 2

Masaru Kuwahara

Engineering,
Japan,
Joined Jul 2020
2
03:34 Jul-10-2020
Selection of RT reference film

Hello.
Which RT reference film shall be used for a steel castings valve, thickness from 25mm to 100 mm?

Case 1: ASTM E446 only
Case 2: E446 for up to 25.8 mm thickness area and E186 over 25.8 mm area.

I think Case 2 is correct, but it is difficult to show up to 25.8 mm area and other area on a film....

Please let me know what do you do at this kind of time?
Thanks in advance.

 
 Reply 
 
Masaru Kuwahara
Engineering,
Japan, Joined Jul 2020, 2

Masaru Kuwahara

Engineering,
Japan,
Joined Jul 2020
2
03:48 Jul-10-2020
Re: Selection of RT reference film
In Reply to Masaru Kuwahara at 03:34 Jul-10-2020 (Opening).

Sorry, mistype....

"I think Case 2 is correct, but it is difficult to show up to 50.8 mm area and other area on a film...."

E446: for up to 2 in.(50.8mm)
E186: 2 - 4 1/2 in.

 
 Reply 
 
Diego
Consultant,
Freelance, Spain, Joined May 2013, 201

Diego

Consultant,
Freelance,
Spain,
Joined May 2013
201
23:08 Jul-10-2020
Re: Selection of RT reference film
In Reply to Masaru Kuwahara at 03:48 Jul-10-2020 .

Hello Masaru.
The answer to your question will depend on the standards, specifications or codes to be applied.
However, as a general idea, ASTM E446 should be used for thicknesses equal to or less than 50 mm, and ASTM E186 for thicknesses greater than 50 mm but less than or equal to 115 mm.
You could use ASTM E446 for both thickness ranges, but this would be very severe for case 1.
You may use a double film technique and a combination of a single and double viewing so as to cover a greater latitude in part thickness with a single exposure.
Regards.

 
 Reply 
 
Diego
Consultant,
Freelance, Spain, Joined May 2013, 201

Diego

Consultant,
Freelance,
Spain,
Joined May 2013
201
23:21 Jul-10-2020
Re: Selection of RT reference film
In Reply to Diego at 23:08 Jul-10-2020 .

Sorry, there is a typo.
Where I say "for case 1", I mean "for thicknesses greater than 50 mm but less than or equal to 115 mm"

 
 Reply 
 

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