Crack in P1 Material from Outer side
Crack in P1 Material from Outer side
(OP)
Hello,
I am facing an issue in our Hydrogen line. There is crack on base metal from the outer side. Inside the fluid is Hydrogen and there is no crack. Pipe thickness is 42mm, Process Temp and pressure is 180 oC and 290barg respectively. Plant commissioning date is 1992. In April 2015, I noted down these crack and it is many on the line. Also the line is fully insulated. I would appreciate if some one help me on this to what should be the reason?
Thanks
Regards
Muhammad
I am facing an issue in our Hydrogen line. There is crack on base metal from the outer side. Inside the fluid is Hydrogen and there is no crack. Pipe thickness is 42mm, Process Temp and pressure is 180 oC and 290barg respectively. Plant commissioning date is 1992. In April 2015, I noted down these crack and it is many on the line. Also the line is fully insulated. I would appreciate if some one help me on this to what should be the reason?
Thanks
Regards
Muhammad





RE: Crack in P1 Material from Outer side
First, do you have a picture or map of the location of the cracks on the OD of the pipe?
This is important because the orientation of the cracks relative to the pipe and location can aid in determining if the cracks were related to fabrication or in-service damage from thermal/mechanical bending stresses.
RE: Crack in P1 Material from Outer side
RE: Crack in P1 Material from Outer side
RE: Crack in P1 Material from Outer side
RE: Crack in P1 Material from Outer side
How much indication is there of corrosion under the insulation?
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P.E. Metallurgy, Plymouth Tube
RE: Crack in P1 Material from Outer side
RE: Crack in P1 Material from Outer side
And no leaks right?
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P.E. Metallurgy, Plymouth Tube
RE: Crack in P1 Material from Outer side
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: Crack in P1 Material from Outer side
RE: Crack in P1 Material from Outer side
RE: Crack in P1 Material from Outer side
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P.E. Metallurgy, Plymouth Tube
RE: Crack in P1 Material from Outer side
Obviously as both Steve and Ed indicated, UT examination to determine crack depth is imperative.
RE: Crack in P1 Material from Outer side
RE: Crack in P1 Material from Outer side
RE: Crack in P1 Material from Outer side