Seems to me that it was tested above the minimum specified yield strength of the base material (over pressured) because there is a lot of deformation visible on the picture, if material/weld failures were present in general you will get a brittle fracture. Radiographic examination makes only sense if the present fracture surface shows any indication which may relate to an improper longitudinal weld.
I would suggest checking base material certificate (also check wall thickness with requirements) and execute some tests on the uninfluenced base material in order to check if values comply with the certificate.
Also check calibration of equipment used during testing, was it giving the correct information?
Also important to know is the procedure followed during testing. For example in which steps was the test pressure applied, and was the temperature of the water / material during testing.
Met vriendelijke groeten / Best Regards,
Herman Pieper
QA-QC Inspector / CSWIP + IWI-C Welding Inspector / IWT / Materials Expert
Job van der Havestraat 6
8384 DB, Wilhelminaoord
Cell: +31 6 51691215
Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]
Verzonden: maandag 22 februari 2016 08:55
Aan: materials-welding@googlegroups.com
Onderwerp: Re: [MW:24349] RE: 24334] Failure Analysis
If possible, you can also take a radiography in the same line of failure (seam or seamless)
to check for any defects in that pipe material.
C Sridhar.
Technical Adviser - Welding,
for Alsta Pristine Engineering Private Limited,. Bangalore
( SS, AL fabricators & A venture of Advance Eng. Training & Inspection Services). Chennai,
Mobile nos: 0 94449 71097, 0 7406 326326, .
Please don't print this e-mail unless you really need to. Save the environment.
Life is like bicycling. To move on, keep balancing throughout..
From: 'Shashank Vagal' via Materials & Welding <materials-welding@googlegroups.com>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>; Nachiket Vagal <nachi.vagal@gmail.com>
Sent: Monday, 22 February 2016 10:10 AM
Subject: Re: [MW:24345] RE: 24334] Failure Analysis
Thanks, Alan. I have asked for more details as it is of a great general interest to all students of failure analysis. I shall make them available on this forum when received.
BR,
Shashank C Vagal
From: Alan Denney <alan@denney1.freeserve.co.uk>
To: materials-welding@googlegroups.com
Sent: Monday, 22 February 2016 3:08 AM
Subject: [MW:24341] RE: 24334] Failure Analysis
Alan Denney
AKD Materials Consulting Ltd
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]
Sent: 21 February 2016 08:51
To: Bathula Raghuram (Mumbai - PIPING) <r.bathula@ticb.com>; Materials & Welding <materials-welding@googlegroups.com>
Subject: [MW:24334] Failure Analysis
Dear all,
Please suggest what could have caused this pipe failure after Hydrotesting..... Consider all general conditions as all details are not known yet
|
BR,
Shashank C Vagal
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