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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


    
 
 Reply 
 
Roberto Falconio
Engineering, NDT/Metrology SUPERVISOR
El Salvador, Joined Feb 2000, 13

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 ------------




    
 
 Reply 
 
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


    
 
 Reply 
 
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 ------------




    
 
 Reply 
 
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


    
 
 Reply 
 

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