where expertise comes together - since 1996

Web's Largest Portal of Nondestructive Testing (NDT)
Open Access Database (Conference Proceedings, Articles, News), Exhibition, Forum, Network

All Forum Boards
Technical Discussions
Career Discussions >
Need a procedure for Corrosion Mapping on Power Pipping & Process Pipping
Job Offers
Job Seeks
Classified Ads
About NDT.net
Articles & News

1086 views
10:56 May-20-2009

Abbas Bombaywala

NDT Inspector
Free Lance,
India,
Joined Jul 2007
91
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

 
12:08 May-20-2009
Prasad
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

 
12:25 May-20-2009

Abbas Bombaywala

NDT Inspector
Free Lance,
India,
Joined Jul 2007
91
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

 
10:56 May-21-2009

florin turcu

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

 
19:20 May-23-2009

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
278
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

 


© NDT.net - The Web's Largest Portal of Nondestructive Testing (NDT) ISSN 1435-4934

Open Access Database, |Conference Proceedings| |Articles| |News| |Exhibition| |Forum| |Professional Network|