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NDT AT HIGH TEMPERATURES

thread483-14578

NDT AT HIGH TEMPERATURES

NDT AT HIGH TEMPERATURES

(OP)
ANY SUGGESTIONS ON NDT TECHNIQUES FOR CHECKING OUT OPERATINAL PRESSURE VESSELS RUNNING AT 300 - 350 CENTIGRADE.

THE VESSELS ARE IN OPERATION IN A REFINERY AND WE CANT TAKE THEM OUT OF SERVICE AT PRESENT.

WE WISH TO CHECK FOR CRACK PROPAGATION AND SHELL THICKNESS.

RE: NDT AT HIGH TEMPERATURES

As for checking the the thickness of the vessel, it can be accomplished by using a Panametrics Model 36 Thickness Gauge with a D790 probe. The Probe has a range of approximately 480 deg. C. Be sure to use a high temperature couplant such as Sonotech 900. Verify the instrument calibration at that temperature by placing the calibration  block on a manway flange if possible.

Crack propagation at that temperature is difficult. Due to personnel and equipment protection.

RE: NDT AT HIGH TEMPERATURES

Thermal Imaging may be a useful NDT tool in this application. If the wall thickness has changes it should show slight variations in temperature.  This is a good non-contact way to quickly evaluate the condition of a vessel. I recomend that the inspection be performed by a certified level 2 or 3 thermographer, with a modern imaging rediometer.  

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