Forum Technical Discussions Re: NDE/Inspection Twisted Heat Exchanger Tubes Posted by: Thomas Vogt (PID_3033), E-mail: Address, on August 14, 2008 at 10:24 : In Reply to: NDE/Inspection Twisted Heat Exchanger Tubes posted by : John O'Brien , E-mail: Address, on August 13, 2008 at 14:03 : John we have on-site experience testing twisted tubes using our internal GWUT system. The key, as usual, is to get the theory right (as guided wave propagation is considerably different than in 'plain' tubes), but we have a pretty good handle on this. There are still some unknowns which need to be addressed (e.g. effect of fouling, types of defects and sensitivity to them), so it is not yet an off-the-shelf product. Let me know if you are interested to know more, I can send a case study. Tom ----------- Start Original Message ----------- : Does anyone have any experience, methods they can share for the examination of twisted tubes in twisted tube heat exchangers. Pasisng internal devices down the tubes seems a problem but wondered if anyone had tried long range UT or other methods. ------------ End Original Message ------------ Follow Ups: Re: NDE/Inspection Twisted Heat Exchanger Tubes Sang Kim 06:27 Aug-15-2008 (5) Nignavewene caurbandank 10:21 Oct-31-2008 (0) Sick Of Really High Gas Prices? Unsunioli 22:23 Oct-23-2008 (0) Investment duptund 08:02 Oct-13-2008 (0) You must see it !!! sharpbobby 05:43 Oct-07-2008 (0) Re: NDE/Inspection Twisted Heat Exchanger Tubes John O'Brien 17:44 Aug-17-2008 (0) Re: NDE/Inspection Twisted Heat Exchanger Tubes Sang Kim 06:26 Aug-15-2008 (0) Post a Followup: Name: E-Mail: Subject: Comments: ----------- Start Original Message ----------- : John : we have on-site experience testing twisted tubes using our internal GWUT system. The key, as usual, is to get the theory right (as guided wave propagation is considerably different than in 'plain' tubes), but we have a pretty good handle on this. There are still some unknowns which need to be addressed (e.g. effect of fouling, types of defects and sensitivity to them), so it is not yet an off-the-shelf product. Let me know if you are interested to know more, I can send a case study. : Tom : : : Does anyone have any experience, methods they can share for the examination of twisted tubes in twisted tube heat exchangers. Pasisng internal devices down the tubes seems a problem but wondered if anyone had tried long range UT or other methods. ------------ End Original Message ------------ Optional Link URL: Example: "http://www....html". Alternative write "http://www.ndt.net/wshop/attach/filename.htm" if you transfered a filename.htm via FTP Page Title: is important! Optional Image URL: http://www....gif Attention! Please click the button only once. This may take a moment to process Forum Technical Discussions Help