Forum Technical Discussions      Re: NDT for Leaking Expansion Bellows Posted by: Simon , E-mail: Address, on September 08, 2008 at 02:52 : In Reply to: Re: NDT for Leaking Expansion Bellows posted by : Simon , E-mail: Address, on September 06, 2008 at 06:35 : ----------- Start Original Message ----------- : ----------- Start Original Message -----------: Dear All,: We have around 20 expansion bellows of 36" dia on hot feed gas (methane+steam) operation at about 800 F verses 85 F ambiant temperature. We are suspecting some of them leaking in the field. : For this, is ther any any NDT pratice in industires / experience to exactly detect the leaking bellows without installing scaffolding near to them and in running condition of plant?: Regards: Qaisar: qabbas@engro.com------------ End Original Message ------------You can use Ultrasonic Leak Detectors to find the leaks from a distance of 50 ft or so and pin point them. You can check with Sonatest for Soundscan System.The other option will be IR Thermography. Depends on your criticality of inspection, you can choose any one of the above methodsSimon ------------ End Original Message ------------ Hi, Basically any leak will generate ultrasonic frequency - it may be pressure, vaccum, electrical or mechanical leak- this depends on the application you look for. The range falls between 30 to 44 kHz for the above said types of leaks. The Pressure leak will be gussing sound, vaccum - crackling sound,electrical - continuous cracking sound and mechanical - similar to above and depends on the rotating unit being tested by the user. Because of the different noise generated by differnt types of leaks, you will be able to identify them. Imagine in a Pipline, you have a constant and continuos flow - which will have a continuous noise. At a point of juncture or obstruction, turbulence generates and the tubulence generates ultrasound. The sound levels will be differnt for each type of leak mentioned above. There are instruments to read the UT frequency generated by these turbulences and these instruements are called UT Leak Detectors. These instruments have many varied appalications. I would say it is your limit of imagination, you will be able to use this instrument. Some innovative applications like identifying the size of coal in feed area in Steam Geenrator, Quality of Oil being used for Lubrication, Sensing snakes in closed Mail boxes and many more. Hope this helps you to undersatnd Leak detection by Ultrasonic method. If you need more info, contact me thru mail. Regards Simon Follow Ups: Re: NDT for Leaking Expansion Bellows Joe Buckley 11:31 Sep-08-2008 (4) Perfect clocks for you crlmartin 11:40 Sep-20-2008 (0) Re: NDT for Leaking Expansion Bellows Qaisar Abbas 04:50 Sep-09-2008 (2) Re: NDT for Leaking Expansion Bellows John O'Brien 13:48 Sep-11-2008 (0) Re: NDT for Leaking Expansion Bellows Athanasios Anastasopoulos 09:00 Sep-09-2008 (0) Post a Followup: Name: E-Mail: Subject: Comments: ----------- Start Original Message ----------- : : ----------- Start Original Message -----------: Dear All,: We have around 20 expansion bellows of 36" dia on hot feed gas (methane+steam) operation at about 800 F verses 85 F ambiant temperature. We are suspecting some of them leaking in the field. : For this, is ther any any NDT pratice in industires / experience to exactly detect the leaking bellows without installing scaffolding near to them and in running condition of plant?: Regards: Qaisar: qabbas@engro.com------------ End Original Message ------------You can use Ultrasonic Leak Detectors to find the leaks from a distance of 50 ft or so and pin point them. You can check with Sonatest for Soundscan System.The other option will be IR Thermography. Depends on your criticality of inspection, you can choose any one of the above methodsSimon : Hi, : Basically any leak will generate ultrasonic frequency - it may be pressure, vaccum, electrical or mechanical leak- this depends on the application you look for. : The range falls between 30 to 44 kHz for the above said types of leaks. The Pressure leak will be gussing sound, vaccum - crackling sound,electrical - continuous cracking sound and mechanical - similar to above and depends on the rotating unit being tested by the user. : Because of the different noise generated by differnt types of leaks, you will be able to identify them. : Imagine in a Pipline, you have a constant and continuos flow - which will have a continuous noise. At a point of juncture or obstruction, turbulence generates and the tubulence generates ultrasound. The sound levels will be differnt for each type of leak mentioned above. : There are instruments to read the UT frequency generated by these turbulences and these instruements are called UT Leak Detectors. These instruments have many varied appalications. : I would say it is your limit of imagination, you will be able to use this instrument. Some innovative applications like identifying the size of coal in feed area in Steam Geenrator, Quality of Oil being used for Lubrication, Sensing snakes in closed Mail boxes and many more. : Hope this helps you to undersatnd Leak detection by Ultrasonic method. : If you need more info, contact me thru mail. : Regards : Simon : ------------ 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