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Technical Discussions
Mathew
Mathew
11:31 Jul-21-2015
ASME B 31.3 Acceptance criteria

Dear Colleagues,

Table 341.3.2 of ASME B 31.3 accepts Incomplete Penetration of length maximum 38 mm in any 150 mm weld length.
If we radiograph a weld length of only 35 mm and if there is incomplete penetration all along the weld, as per the above code, is it acceptable?

Thanks for your sharing your opinion.

Mathew

    
 
 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
14:16 Jul-21-2015
Re: ASME B 31.3 Acceptance criteria
In Reply to Mathew at 11:31 Jul-21-2015 (Opening).

My take is 38/150 mm x 100. If the weld length is only 35 mm, then the acceptance criteria should be the percentage of 38/150

    
 
 Reply 
 
Cesar Tovar
NDT Inspector, Quality assurance Representative
Toronto Transit Commission, Mexico, Joined Sep 2014, 7

Cesar Tovar

NDT Inspector, Quality assurance Representative
Toronto Transit Commission,
Mexico,
Joined Sep 2014
7
18:57 Jul-21-2015
Re: ASME B 31.3 Acceptance criteria
In Reply to Mathew at 11:31 Jul-21-2015 (Opening).

Not for me, this is a very small weld length, you should hire a good welder and reject this joint.

Regards

    
 
 Reply 
 
Diego
Consultant,
Freelance, Spain, Joined May 2013, 188

Diego

Consultant,
Freelance,
Spain,
Joined May 2013
188
08:35 Jul-22-2015
Re: ASME B 31.3 Acceptance criteria
In Reply to Mathew at 11:31 Jul-21-2015 (Opening).

Mathew.
ASME B31.3 / Edit. 2014, Table 341.3.2 accepts: incompleta penetration of length 38 mm (1.5 in.) in any 150 mm (6 in.) weld length or 25% of total weld length, whichever is less. Then and your casé (Weld length 35 mm) you should accept up to 8,75 mm of incompleta penetration

1    
 
 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
13:01 Jul-22-2015
Re: ASME B 31.3 Acceptance criteria
In Reply to Diego at 08:35 Jul-22-2015 .

Totally agree with Diego

    
 
 Reply 
 
Mathew
Saudi Arabia, Joined Jul 2015, 11

Mathew

Saudi Arabia,
Joined Jul 2015
11
13:19 Jul-22-2015
Re: ASME B 31.3 Acceptance criteria
In Reply to Diego at 08:35 Jul-22-2015 .

But where in the code says 25% of the weld length?

    
 
 Reply 
 
Diego
Consultant,
Freelance, Spain, Joined May 2013, 188

Diego

Consultant,
Freelance,
Spain,
Joined May 2013
188
18:07 Jul-22-2015
Re: ASME B 31.3 Acceptance criteria
In Reply to Mathew at 13:19 Jul-22-2015 .

Mathew.
See you "Criterion Value Notes for Table 341.3.2", column "Acceptable Value Limits" for symbols "B" and "C"

    
 
 Reply 
 

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