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- since 1996 -
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Technical Discussions
Marius Purcell
Engineering,
Sasol (Pty) Ltd., South Africa, Joined Jul 2018, 10

Marius Purcell

Engineering,
Sasol (Pty) Ltd.,
South Africa,
Joined Jul 2018
10
15:26 Aug-18-2019
Ultrasonic Examination of Thick Walled Material, with weld overlay, (7.63") for HTHA damage Assessment

Dear Forum,

Our High Pressure (HP) Reactor Systems are susceptible to hydrogen damage in the form of HTHA. The design of these materials and the associated components (self reinforced set-through nozzle joints) are 7.3" with 0.3" weld overlay (S/S). The biggest obstacle is the fact that the material is heavy walled and that voiding and fissuring (stage 2 and borderline stage 3 HTHA damage) are sought after above the overlaid surface area extending into the base material itself (the last 2" of material from the ID surface). I'm bringing this challenge to this platform in an attempt to find an ultrasonic solution, be it a customizable one. Does anybody here have experience in examining heavy walled material of this extend seeking fissuring, or to be optimistic - granular voiding, and have the evidence to back-up the claim of such inspection success story?

Feel free to provide me with references to NDT service providers, product developers and or research and development articles that relates to the above mentioned. I thank you in advance for your engagement.

Regards,

Marius

 
 Reply 
 
Ricardo Andreucci
FATEC - Technological University of Sao Paulo, Brazil, Joined May 2018, 31

Ricardo Andreucci

FATEC - Technological University of Sao Paulo,
Brazil,
Joined May 2018
31
20:19 Aug-19-2019
Re: Ultrasonic Examination of Thick Walled Material, with weld overlay, (7.63") for HTHA damage Assessment
In Reply to Marius Purcell at 15:26 Aug-18-2019 (Opening).

Hi Mr. Mario

I have some experience in ultrasonic testing in thick walled casting martensitc material without any weld overlay, used in the manufacture of rotors for hydroelectric plants. The thickness is about 100 to 250 mm and we have used TR angle beam probes, 2 MHz frequency, supplied by RTD, by manual technique, with very good results, in order to detect typical casting discontinuities.
In your case, I think using the same transducers will give you good results because they are suitable for these materials application.
Good luck

 
 Reply 
 

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