Forum Technical Discussions Re: MT, PT in Sub zero Temp Posted by: Jukka Hakala (PID_2162), E-mail: Address, on July 07, 2008 at 20:12 : In Reply to: MT, PT in Sub zero Temp posted by : RT. Jeyakumar , E-mail: Address, on July 01, 2008 at 08:10 : If you have to do MT/PT-inspections below the temperatures mentioned in ASME or EN standards you should bear in mind that there is some restrictions. PT: EN571-1: "For temperatures below +10deg.C only penetrant product families and procedures approved in accordance with EN ISO 3452-2 (revision of ISO 2452-2:2000 and its previous name was prEN 571-2) for this purpose shall be used." Even if you will use some penetrant chemical which is suitable for "cold" conditions for example Bycotest RP20LT (-15 to +35 deg.C) and you have approved procedures and you perform the functionality test with using two Al-pieces, your inspection may fail. Most important thing is that below +10deg.C the condensing moisture/water/ice on the surface and in the discontinuties prevents penetrants penetration and you will get no indications. Whenever possible, it is much better to get the inspection object to the standard temperature range e.g. using blowtorch, bunsen burner, electrical heater etc. MT: I recommend using MT-method with aerosol media. Those chemicals are made on petroleum suspension and they will function on quite cold conditions. Jukka ----------- Start Original Message ----------- : Good day Everyone, : Is there any special chemicals available for doing above NDT in Sub Zero temperature. : And any code & Standard specifically for this kind of regions? : Please help me giving some tips. : Thanks in advance, : RT. Jeyakumar ------------ End Original Message ------------ Follow Ups: Post a Followup: Name: E-Mail: Subject: Comments: ----------- Start Original Message ----------- : If you have to do MT/PT-inspections below the temperatures mentioned in ASME or EN standards you should bear in mind that there is some restrictions. : PT: EN571-1: "For temperatures below +10deg.C only penetrant product families and procedures approved in accordance with EN ISO 3452-2 (revision of ISO 2452-2:2000 and its previous name was prEN 571-2) for this purpose shall be used." : Even if you will use some penetrant chemical which is suitable for "cold" conditions for example Bycotest RP20LT (-15 to +35 deg.C) and you have approved procedures and you perform the functionality test with using two Al-pieces, your inspection may fail. : Most important thing is that below +10deg.C the condensing moisture/water/ice on the surface and in the discontinuties prevents penetrants penetration and you will get no indications. Whenever possible, it is much better to get the inspection object to the standard temperature range e.g. using blowtorch, bunsen burner, electrical heater etc. : MT: I recommend using MT-method with aerosol media. Those chemicals are made on petroleum suspension and they will function on quite cold conditions. : Jukka : : Good day Everyone, : : Is there any special chemicals available for doing above NDT in Sub Zero temperature. : : And any code & Standard specifically for this kind of regions? : : Please help me giving some tips. : : Thanks in advance, : : RT. Jeyakumar ------------ 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