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358 views
01:07 Jan-28-2003

Gary Woodside

NDT Inspector,
Visual Testing Services Ltd.,
United Kingdom,
Joined Feb 2000
8
Stress Corrosion Cracking

We have reported indications of SCC on gas manifold internal change of section. The external geometry is a 2" weldlet on a 6" main pipe. The internal surface is very roughly machined and we have recommended radiography to confirm the indications. Due to the activity on site at present this can't be done without delaying start up. The rough internal surface can be accessed through a 1" bore pipe 6" long, the external surface is accessible. Can anybody advise the best method to:

1. Confirm our findings for the client.
2. Size the cracking found.

Thanks for your advice.
Gary


 
03:30 Jan-28-2003

J. Mark Davis

Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama,
USA,
Joined Mar 2000
83
Re: Stress Corrosion Cracking Gary,

The ID Creeping Wave method may be an application for your inspection problem. Or using Focused Refracted Longitudinal Waves (or OD creeping Waves) like HALT maybe effective.

If you are not familar with these methods go to ndt.net publications sections and see the Advanced UT Flaw Sizing Handbook.

I conduct Advanced UT Detection and Sizing Training Courses on these methods.

Sincerely,

J. Mark Davis

We have reported indications of SCC on gas manifold internal change of section. The external geometry is a 2" weldlet on a 6" main pipe. The internal surface is very roughly machined and we have recommended radiography to confirm the indications. Due to the activity on site at present this can't be done without delaying start up. The rough internal surface can be accessed through a 1" bore pipe 6" long, the external surface is accessible. Can anybody advise the best method to:
.
: 1. Confirm our findings for the client.
: 2. Size the cracking found.
.
: Thanks for your advice.
: Gary
.



 


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