ASME B31.3 Normal Fluid Service 5% Random Radiography Individual or Total 5% 1

[D_Jones]

Morning Folks,

The question: When B31.3 states no less than 5% of circumferential butt and miter groove welds shall be examined (ref. ASME B31.3 2014 341.4.1 (b)), it says each welder's work product must be represented (ref. ASME B31.3 2014 341.4.1 (b)). Does this mean 5% of each welder's work product in a lot needs radiography or 5% of the total lot with each welder represented i.e. Stan, and Dirk each produce 40 welds in a lot for a total of 80 welds. Can you x-ray 3 of Stan's welds and only 1 of Dirks, or do you need to x-ray 2 of Stan's and 2 of Dirk's to be compliant?

I have a ton of gray area B31.3 questions but we'll stop here for today!

Thanks

 

[david339933]

Each welder must be represented in the 5%....not 5% of each welder.

 

[DVWE]

Agree with David.

Can you x-ray 3 of Stan's welds and only 1 of Dirks, or do you need to x-ray 2 of Stan's and 2 of Dirk's to be compliant?

Both scenarios will work, although the latter would not be a requirement.

 

[DekDee]

As per Davids response

Interpretation: 1·27
Subject: Random Radiography in 336.5.1(b)
Date Issued: October 10, 1980
File: 1489
Question (1): Is it the intent of 336.5.1(b) that. in addition to the required radiography of 5% of
circumferential buttwelds for a designated lot of piping, a minimum of 5% of each welder's welds be also
radiographed?
Reply (1): No. It is the opinion of the Committee that it is the intent of the Code that each welder's
work be included in the 5% examination required in 336.5.1(b). It is not the intent to require examination
of 5% of each welder's work.

 

[D_Jones]

Thanks for the speedy reply guys! Very helpful

 

[weldstan]

But do beware of Owner requirements which often mandate 5% of each welder.