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 Technical Discussions | | Andre van Vuuren
 | Andre van Vuuren
|  01:54 Nov-04-2006
Pipeline inspection Greetings Looking for a solution to detect longitudinal cracks in "in-service" pipelines 6"-12" OD, Wall thickness 12-14mm. External scanning methods only. No access to bore. Andre van Vuuren
| |
| | | |  Roberto Falconio
Engineering, NDT/Metrology SUPERVISOR
El Salvador, Joined Feb 2000,  13 | | 05:40 Nov-04-2006
Re: Pipeline inspection Hi! You may use ultrasonic shear wave technique, I will assume per your message that cracks runs parallel to the pipe axis. In this case you may manufacture a special transducer that fit the outer surface of the pipe, and perform the scan in order to detect on the first leg in case that cracks start at the inner surface. You may also manufacture a standard with the same geometry and material of the pipe you are inspecting. You may ask to machine several EDM notches of different lenght and depth so you can evaluate the response of your UT system.
Hope that help a little
Best regards
----------- Start Original Message -----------
: Greetings
: Looking for a solution to detect longitudinal cracks in "in-service" pipelines 6"-12" OD, Wall thickness 12-14mm. External scanning methods only. No access to bore.
: Andre van Vuuren
------------ End Original Message ------------
| |
| | | | mj
| mj
| 09:50 Nov-08-2006
Re: Pipeline inspection go for b scan, if u want more details send u r quires to my email
| |
| | | | G.Madhesan
Consultant, Welding ýnspector/QAQC inspector
CHENNAI UNIVERSITY, Turkey, Joined Nov 2004, 10 |
G.Madhesan
Consultant, Welding ýnspector/QAQC inspector
CHENNAI UNIVERSITY,
Turkey,
Joined Nov 2004
10
| 00:43 Mar-15-2007
Re: Pipeline inspection First up all difficult to scanning at 6" pipe because of curvature;If you can use of shoe also difficult to find the scattered cracks longitutunally.
If possible with limitations of service condition and temprature you can go for gamma ray.---------- Start Original Message -----------
: Greetings
: Looking for a solution to detect longitudinal cracks in "in-service" pipelines 6"-12" OD, Wall thickness 12-14mm. External scanning methods only. No access to bore.
: Andre van Vuuren
------------ End Original Message ------------
| |
| | | | JW
| JW
| 05:30 Mar-19-2007
Re: Pipeline inspection ----------- Start Original Message -----------
: First up all difficult to scanning at 6" pipe because of curvature;If you can use of shoe also difficult to find the scattered cracks longitutunally.
: If possible with limitations of service condition and temprature you can go for gamma ray.
: ---------- Start Original Message -----------
: : Greetings
: : Looking for a solution to detect longitudinal cracks in "in-service" pipelines 6"-12" OD, Wall thickness 12-14mm. External scanning methods only. No access to bore.
: : Andre van Vuuren
------------ End Original Message ------------Try using TOFD
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