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- since 1996 -
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Technical Discussions
Mario Talarico
NDT Inspector,
Italy, Joined May 2010, 423

Mario Talarico

NDT Inspector,
Italy,
Joined May 2010
423
12:23 Mar-29-2018
ISO 17640 and ISO 11666: thickness definition.

In paragraph 3 of En-Iso 17640 Thickness (t) is defined "thickness of parent material (thinnest part)": first definition of "t". Elsewhere in En-Iso 17640, in table A1-A7, thickness (t) appears mostly as beveled part: second representation of "t".

Considering that En-Iso 1166 recalls in its references the En-Iso 17640 and the thickness (t) terminology is reproposed without further specifications, which of the two previous definitions must be applied in the acceptability criteria indicated in En-Iso 11666?

Greetings
Mario

 
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Laurent
Consultant,
France, Joined Mar 2016, 16

Laurent

Consultant,
France,
Joined Mar 2016
16
11:00 Mar-30-2018
Re: ISO 17640 and ISO 11666: thickness definition.
In Reply to Mario Talarico at 12:23 Mar-29-2018 (Opening).

Hi Mario
I understand by considering t for the thinnest part in ISO 11666, you would be in the most restrictive case for acceptance criteria.
BR

 
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Mario Talarico
NDT Inspector,
Italy, Joined May 2010, 423

Mario Talarico

NDT Inspector,
Italy,
Joined May 2010
423
01:59 Mar-31-2018
Re: ISO 17640 and ISO 11666: thickness definition.
In Reply to Laurent at 11:00 Mar-30-2018 .

Of course Laurent, of course, as usual!
But it's not a good perspective if I look at forty nozzles set-in 5 to 8 mm thick on a 35 mm shell.
I think that the production deserves a little more consideration: to repair because it is right to repair, not because we do not know how to dance a 't' in a document that is more than thirty years old.
I really feel like a bad service .....
Greetings
Mario

 
 Reply 
 
Matthias
NDT Inspector, CEO
Dreifeld Materialprüftechnik, Germany, Joined Sep 2005, 101

Matthias

NDT Inspector, CEO
Dreifeld Materialprüftechnik,
Germany,
Joined Sep 2005
101
21:01 Apr-10-2018
Re: ISO 17640 and ISO 11666: thickness definition.
In Reply to Mario Talarico at 12:23 Mar-29-2018 (Opening).

Mario, I dont see where you get two definitions from.
When you look at A1-A7 you get a clear representation of what should be used for t in the drawing.

You can always make suggestions or report mistakes to the committee, theres a link on their website to do so.

 
 Reply 
 
Mario Talarico
NDT Inspector,
Italy, Joined May 2010, 423

Mario Talarico

NDT Inspector,
Italy,
Joined May 2010
423
21:57 Apr-11-2018
Re: ISO 17640 and ISO 11666: thickness definition.
In Reply to Matthias at 21:01 Apr-10-2018 .

Matthias,
thanks for your reply. This rule is very important.
I agree with you that it is clear what should be used for 't' in figures A1-A7: it is the beveled part in non-buttweld joints ( T-Joint, nozzles or L-joint ).
The question I asked is: when using 't' in the acceptability table of ISO 11666, we mean 't' defined as 'beveled part' as indicated in the figures A1-A7 of ISO 17640 or 't' defined, as 'thinnest part' as indicated in par. 3 of ISO 17640?
Also in par. 1 'Scope' of ISO 17640, where the applicability of the standard for 'thickness greater than or equal to 8 mm' is defined, applies to the same question: we mean thickness as 't' indicated in fig. A1-A7 (as it would seem, considering that all the thicknesses of the tables related to the figures a1-a7 start from 8 mm) or is the definition of 't' as 'thinnest part' valid?
I hope I was clear.
Greetings
Mario

 
 Reply 
 
Matthias
NDT Inspector, CEO
Dreifeld Materialprüftechnik, Germany, Joined Sep 2005, 101

Matthias

NDT Inspector, CEO
Dreifeld Materialprüftechnik,
Germany,
Joined Sep 2005
101
13:12 Apr-12-2018
Re: ISO 17640 and ISO 11666: thickness definition.
In Reply to Mario Talarico at 21:57 Apr-11-2018 .

Hello Mario,
I would always use the "t" which is shown in the Pictures A.1-A.7 - this is not based on a clear instruction from the standard, its just my personal opinion.

If you are not sure, I would always opt for the thinner thickness.
If I read your case correctly this would mean a difference of DKSR 0,5 mm (testing level 2).

 
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