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- since 1996 -

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Technical Discussions
Jaga
Jaga
06:01 May-07-2009
High Temp UT on Vessel

Dear all,
i need some help on inspection and calibration procedure for high temp pressure vessel.
the temperature range from 50 degree C to 250 degree C.
Thank you.

    
 
 Reply 
 
Roger Duwe
NDT Inspector, API-510, 570, 653
MISTRAS, USA, Joined Jan 2009, 148

Roger Duwe

NDT Inspector, API-510, 570, 653
MISTRAS,
USA,
Joined Jan 2009
148
13:53 May-07-2009
Re: High Temp UT on Vessel
In Reply to Jaga at 06:01 May-07-2009 (Opening).

First, pick a couplant that can be used over the entire temperature range. My favorite is heavy silicone grease -- Dow Corning's High Vacuum Grease.

Second, bring your cal block up to temperature -- ASME limits are plus/minus 25 degrees F [14 degrees C] of the part in question. Then calibrate. I typically tuck my setp-block into the insulation on the part and calibrate there at the hot part.

    
 
 Reply 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
15:11 May-07-2009
Re: High Temp UT on Vessel
In Reply to Jaga at 06:01 May-07-2009 (Opening).

This application note on high temperature ultrasonic testing may be helpful:

http://www.olympus-ims.com/en/ndt-application/183-id.209715235.html

    
 
 Reply 
 

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