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Zawada NDT
Suppliers of instruments to test steel wire ropes in-situ, using magnetic, non-destructive method.
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Career Discussions
Abbas Bombaywala
NDT Inspector
Free Lance, India, Joined Jul 2007, 92

Abbas Bombaywala

NDT Inspector
Free Lance,
India,
Joined Jul 2007
92
10:56 May-20-2009
Need a procedure for Corrosion Mapping on Power Pipping & Process Pipping

Dear Members i need a procedure to carry ouy corrosion mapping on power pipping as well as process pipping

With Regards

 
 Reply 
 
Prasad
Prasad
12:08 May-20-2009
Re: Need a procedure for Corrosion Mapping on Power Pipping & Process Pipping
In Reply to Abbas Bombaywala at 10:56 May-20-2009 (Opening).

Dear Abbas,

Please could you provide us some more details about the job? drawings, items to be inspected, proposed inspection equipment etc?

Thanks,

Prasad

 
 Reply 
 
Abbas Bombaywala
NDT Inspector
Free Lance, India, Joined Jul 2007, 92

Abbas Bombaywala

NDT Inspector
Free Lance,
India,
Joined Jul 2007
92
12:25 May-20-2009
Re: Need a procedure for Corrosion Mapping on Power Pipping & Process Pipping
In Reply to Prasad at 12:08 May-20-2009 .

Its a 10" Pipeline thickness of 6 mm, we are going to use TD Scan with Phoenix XY Motorized Scanner,

Regards

 
 Reply 
 
florin turcu
R & D
Dept. of Electrical Systems and Automation - University of Pisa, Italy, Joined Jul 2007, 9

florin turcu

R & D
Dept. of Electrical Systems and Automation - University of Pisa,
Italy,
Joined Jul 2007
9
10:56 May-21-2009
Re: Need a procedure for Corrosion Mapping on Power Pipping & Process Pipping
In Reply to Abbas Bombaywala at 10:56 May-20-2009 (Opening).

Dear Abbas,
I think Guided Wave might be a good solution for corrosion mapping. In addition, by using low-cost magnetostrictive sensors you can distribute them on your piping and leave them there for further inspection. This way you can do not only one corrosion mapping, but also long-term monitoring to see slight changes in pipe-wall condition.
For further details, please contact me, or visit our site: www.guidedwave-ndt.com

Regards,
Florin Turcu

 
 Reply 
 
John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 280

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
280
19:20 May-23-2009
Re: Need a procedure for Corrosion Mapping on Power Pipping & Process Pipping
In Reply to Abbas Bombaywala at 10:56 May-20-2009 (Opening).

Abbas if this is new to you maybe you should discuss with the equipment vendor. 6 mm nominal is relatively thin and if you get 50% wall loss then we are talking 3 mm or less so selection of the correct transducer will be critical.
Step one is to talk to the relevent corrosion specialist about the corrosion morphology expected and the expectation sof the survey in terms of thickness and area resolution. This will determine not only probe selection but also the spatial resolution of your scanner - remember you probably need three hits per pixel increment to be confident true corrosion detection - this is of course is related to beam spread, PRF and grid increment.
Step two - whats on the outside of the pipe and are you going to measure pulse to first BWE or do you need echo to echo to remove coating thickness.
Step three - what post processing do you want to do - are you going to record gated signals or full waveform capture.

From these you should be able to construct a procedure.

Good luck

 
 Reply 
 

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