Technical Discussions: Re: NDT for Leaking Expansion Bellows

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Re: NDT for Leaking Expansion Bellows
Posted by: Qaisar Abbas (PID_3609), E-mail: Address, on September 09, 2008 at 04:50 :
In Reply to: Re: NDT for Leaking Expansion Bellows posted by : Joe Buckley , E-mail: Address, on September 08, 2008 at 11:31 :
Thanks to All,
We appreciate your comments and advices.
As per your inputs, we will first go for thermography and then to Soundscan. We have thermography camera with us and will try with it. For Soundscan, we will dig out local supplier for services.
Once again, Thanks
Qaisar Abbas

----------- Start Original Message -----------
: I confirm that the Soundscan system should work well for this application. (as I understand it)
: In general any tubulent gas leak that you 'could' hear or feel (not at 800 degrees...) from a few tens of cm away in a quiet lab environment produces ultrasound that can be detected from a distance of maybe 20m (or more with the Powerbeam 300 concentrator) in a typical factory or industrial environment.
: The Powerbeam also restricts the 'field of hear' to a few degress of angle - very helpful if there are other noise sources around. and has a laser sighting device.
: you can find information on the sonatest website - we are updating this at the moment, so use the search facility on 'soundscan'
: Rgds
: Joe
: : : ----------- 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 ------------

Follow Ups:

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)

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----------- Start Original Message ----------- : Thanks to All, : We appreciate your comments and advices. : As per your inputs, we will first go for thermography and then to Soundscan. We have thermography camera with us and will try with it. For Soundscan, we will dig out local supplier for services. : Once again, Thanks : Qaisar Abbas : : : I confirm that the Soundscan system should work well for this application. (as I understand it) : : In general any tubulent gas leak that you 'could' hear or feel (not at 800 degrees...) from a few tens of cm away in a quiet lab environment produces ultrasound that can be detected from a distance of maybe 20m (or more with the Powerbeam 300 concentrator) in a typical factory or industrial environment. : : The Powerbeam also restricts the 'field of hear' to a few degress of angle - very helpful if there are other noise sources around. and has a laser sighting device. : : you can find information on the sonatest website - we are updating this at the moment, so use the search facility on 'soundscan' : : Rgds : : Joe : : : : ----------- 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 ------------

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