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Technical Discussions 1029 views 01:54 Nov-04-2006 Andre van Vuuren 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 Post Reply      Translate            05:40 Nov-04-2006 Roberto Falconio Engineering, NDT/Metrology SUPERVISOR El Salvador, Joined Feb 2000 13 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 ------------ Post Reply      Translate            09:50 Nov-08-2006 mj Re: Pipeline inspection go for b scan, if u want more details send u r quires to my email Post Reply      Translate            00:43 Mar-15-2007 G.Madhesan Consultant, Welding ýnspector/QAQC inspector CHENNAI UNIVERSITY, Turkey, Joined Nov 2004 10 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 ------------ Post Reply      Translate            05:30 Mar-19-2007 JW 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 Post Reply      Translate