Dear Mr.Lassaad ,
Pitting may occur if any grinding or cutting work is carried out on any material near by or from grid blasting in the vicinity .If your welder used normal carbon steel wire brush then also it could pitting could occur .Exposure to sea beeze or salt water spray or any corrosive atmosphere also cause pitting .
Regards,
S.Muhtukrishnan
On Sat, May 3, 2014 at 1:26 PM, Lassaad <lassaad.mokrani@gmail.com> wrote:
Dear Experts,
While radiographying a piping joint, our RT subcontractor has found some pitting indication in pipe base métal. Thé pipés are supplied by our end client. Our client tried to minimize thé issue saying" it might be caused by some operation done by us, being in HAZ limits".
Design code is B31.3
My question is what Could be the major reason of that defect? Is It most likely to be from piping base metal fabrication?
Please share your experience in this field.
Many thanks
Sent from my ThinkPad S230u
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