Forum Technical Discussions      Re: NDT for Leaking Expansion Bellows Posted by: Michel Couture (PID_2805), E-mail: Address, on September 07, 2008 at 18:00 : In Reply to: Re: NDT for Leaking Expansion Bellows posted by : Simon , E-mail: Address, on September 06, 2008 at 06:35 : Hi Qaisar, I don't know what your plant looks like and I'm not an expert in the field I will suggest, but from what I know and the picutres I saw about it on the internet, I would give Infrared Thermography a chance. As I said, I'm not an expert, but if you have a gas leak, I'm sure the increase velocity of the excaping gas will cause a change in its temperature. It should be lower than the operating temperature yet higher than ambient. That should make it detectable with Thermography. Cheerio's Michel ----------- 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 ------------ Follow Ups: Post a Followup: Name: E-Mail: Subject: Comments: ----------- Start Original Message ----------- : Hi Qaisar, : I don't know what your plant looks like and I'm not an expert in the field I will suggest, but from what I know and the picutres I saw about it on the internet, I would give Infrared Thermography a chance. As I said, I'm not an expert, but if you have a gas leak, I'm sure the increase velocity of the excaping gas will cause a change in its temperature. It should be lower than the operating temperature yet higher than ambient. That should make it detectable with Thermography. : Cheerio's : Michel : : ----------- 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 ------------ 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