Forum Technical Discussions      Re: UT scanning Posted by: Tom Nelligan    (PID_139), E-mail: Address, on December 04, 2008 at 14:47 : In Reply to: UT scanning posted by : Shibu T James , E-mail: Address, on December 04, 2008 at 11:58 : Using a proper transducer and instrument setup, you should be able to measure the wall thickness of any stainless steel pipe that you're likely to encounter. Using a 20 MHz delay line transducer you could measure as thin as 0.25 mm, and using a 500 KHz contact transducer you could measure as high as 100 mm (and much thicker in carbon steel as opposed to stainless). For typical pipe wall thicknesses in the 10 mm to 20 mm range we would usually recommend working at 2.25 MHz. Note that inexpensive ultrasonic gages designed for corrosion survey will sometimes have problems on stainless steel because of grain scatter noise. Better instruments typically permit gain and blanking adjustments that will allow you to work around that problem. Follow Ups: Post a Followup: Name: E-Mail: Subject: Comments: ----------- Start Original Message ----------- : Using a proper transducer and instrument setup, you should be able to measure the wall thickness of any stainless steel pipe that you're likely to encounter. Using a 20 MHz delay line transducer you could measure as thin as 0.25 mm, and using a 500 KHz contact transducer you could measure as high as 100 mm (and much thicker in carbon steel as opposed to stainless). For typical pipe wall thicknesses in the 10 mm to 20 mm range we would usually recommend working at 2.25 MHz. : Note that inexpensive ultrasonic gages designed for corrosion survey will sometimes have problems on stainless steel because of grain scatter noise. Better instruments typically permit gain and blanking adjustments that will allow you to work around that problem. ------------ 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