Corrosion in HAZ
Corrosion in HAZ
(OP)
Hi, I appreciate any input on this.
Two corroded area reported on NPS 36 9.5mm wall. Pipe is X65-448 gr. Corrosions do not meet our criteria to repair (RPR is > 1) based on general corrosion. I wanted to get your thoughts on the close proximity of these features to the welds. They do not directly interact with the Girth weld but they are in the HAZ. NDT contractor performed radiography and advised they would pass these welds based on the present day Z662-11 criteria. They performed ultrasonics and shear wave+MPI and found no internal corrosion or linear indications on the interior/exterior. External mapping was completed with pit gauge and UT.
Do you see any issue as corroded area is on HAZ and very close to weld. Is there any risk of stress corrosion cracking?
Two corroded area reported on NPS 36 9.5mm wall. Pipe is X65-448 gr. Corrosions do not meet our criteria to repair (RPR is > 1) based on general corrosion. I wanted to get your thoughts on the close proximity of these features to the welds. They do not directly interact with the Girth weld but they are in the HAZ. NDT contractor performed radiography and advised they would pass these welds based on the present day Z662-11 criteria. They performed ultrasonics and shear wave+MPI and found no internal corrosion or linear indications on the interior/exterior. External mapping was completed with pit gauge and UT.
Do you see any issue as corroded area is on HAZ and very close to weld. Is there any risk of stress corrosion cracking?





RE: Corrosion in HAZ
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Corrosion in HAZ
RE: Corrosion in HAZ
Does API 579-1 covers gas transmision pipelines?
RE: Corrosion in HAZ
RE: Corrosion in HAZ