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Technical Discussions
Nandesh Kumar A
Nandesh Kumar A
14:21 Feb-28-2010
Can anybody explain me for ISO 13847 ?

One of our code (ISO 13847 ) says the following.

"The total area, when projected radially through the weld, shall not exceed 2% of the projected weld area in the radiograph. The area shall be the length the weld affected by the porosity (with a minimum length of 150 mm ) times the maximum width of the weld."

The above criterion is in order to evaluate porosity on a radiograph. Now I've a uniformly distributed porosity of upto 45 mm length. The total length of the weld is 192 cm (24 inch OD, pipeline )Can anybody explain me (if possible with a sketch) how to proceed with it?

Replies are highly appreciated.

Nandesh Kumar

Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
15:09 Mar-01-2010
Re: Can anybody explain me for ISO 13847 ?
In Reply to Nandesh Kumar A at 14:21 Feb-28-2010 (Opening).

Nandesh

If the weld length affected by porosity is 45mm, this is less than 150mm and so you must use the default 150mm figure. Multiply this by the maximum width of the weld in the affected region and then multiply by 0,02 (2%). Say the weld width is 25mm: 150mm x 25mm x 0,02 = 75 sq mm. Measure and add together all pore diameters in the affected region, multiply the total by pi. If the calcualted figure is less than your previous calculation (75 sq mm in my example) then the area is accpetable. Greater pore area sum total = rejectable.

Hope this helps

Nandesh
Nandesh
05:33 Mar-02-2010
Re: Can anybody explain me for ISO 13847 ?
In Reply to Nigel Armstrong at 15:09 Mar-01-2010 .

Thanks Nigel...but can ypu please explain me whats the terms " projected radially" and " projected weld area " in my post?
Regards,

Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
06:34 Mar-02-2010
Re: Can anybody explain me for ISO 13847 ?
In Reply to Nandesh at 05:33 Mar-02-2010 .

Nandesh

The use of "projected" radially and weld area is to maintain proportionality with regard to image magnification. If the set-up used has a low ratio between source-to-object distance and material thickness, differential magnification will enlarge a source-side pore more than a film-side pore.

Assuming you used a panoramic exposure on a 24" sch 40 pipe (wt = 0,375") then differential magnification is not a problem you need worry about.

Hope that helps

Nigel

13:08 Feb-08-2014
Re: Can anybody explain me for ISO 13847 ?
In Reply to Nigel Armstrong at 15:09 Mar-01-2010 .

"The distribution of scattered porosity is such that when projected radially through the weld the total area of porosity exceeds 1% of any 600mm Sq of projected weld metal."

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