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- since 1996 -
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Technical Discussions
John
John
09:10 Apr-09-2005
Burn Through

I have a question and would like other's opinion(s) on the subject.

In API-1104, 19th Edition, paragraph 9.3.6 states, "any length of internal concavity is acceptable provided the radiographic density of the radiographic image of the internal concavity does not exceed that of the thinnest adjacent parent material".

Now, Paragraph 9.3.7.2 discusses the acceptance of Burn Through. Esentially it says that burn through acceptance/rejection is based on the dimension of the burn through "and" the density.

For example, if an indication of burn through is observed on the radiograph, and it is exactly or a little less than 1/4" but the density of the burn through is 2.8 and the density of the adjacent base material is 2.3, is the burn through considered rejected or accepted?

Do you then evaluate it as internal concavity and reject it?


    
 
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Clamp
Clamp
05:49 Apr-17-2005
Re: Burn Through
Personally I would reject it based on the fact that that area of the weld is darker than the density of the base material. "When in doubt...cut it out!"

----------- Start Original Message -----------
: I have a question and would like other's opinion(s) on the subject.
: In API-1104, 19th Edition, paragraph 9.3.6 states, "any length of internal concavity is acceptable provided the radiographic density of the radiographic image of the internal concavity does not exceed that of the thinnest adjacent parent material".
: Now, Paragraph 9.3.7.2 discusses the acceptance of Burn Through. Esentially it says that burn through acceptance/rejection is based on the dimension of the burn through "and" the density.
: For example, if an indication of burn through is observed on the radiograph, and it is exactly or a little less than 1/4" but the density of the burn through is 2.8 and the density of the adjacent base material is 2.3, is the burn through considered rejected or accepted?
: Do you then evaluate it as internal concavity and reject it?
------------ End Original Message ------------




    
 
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