Hello, One of our customers is having problems of stress corrosion cracking in large heat exchanger tubes (diam 300mm, length 3m, stainless steel). The inside of the tube is empty and accessible from one side, while the outside is in contact with oil of around 90°C. Does anybody know companies (preferably in or close to Belgium) having systems capable of inspecting (UT/ET) this kind of pipe, using e.g. robotic crawlers? Suggestions are welcome at my e-mail address (kris.vanderostyne@METALogic.be). Thank you very much in advance,
05:55 May-11-2003 John O'Brien Consultant, - Chevron ETC , USA, Joined Jan 2000 278
Re: inspection of SCC in steel tubes You could try Physical Acoustics BV - they are in Rotterdam and have a UT system called Tubescan which has Large Diamter plus Shear and Compressional Wave UT capability.
Re: inspection of SCC in steel tubes We have had good success in detection of SCC regardless the orientation of the damage using an eddy current probe that is contoured to the surface. In the past, the scans were done by hand due to the complexity and the diameter variations (25mm to 70cm) of the piping. However, altering the design to contour the probe to the ID curvature of your piping should require minimal effort. Fixturing of the probe(s) would require greater effort but it can be done.
You can see an example of our OD probe at www.corestar-corp.com, click on Eddy current and RFT Probes, then the CSP link at the bottom of the page.