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Re: [MW:14621] CS reactor exposed to temperature run away in presence of H2

By Materials & Welding
What was the pressure during the excursion of high temperature?
 
What was the partial pressure of Hydrogen during sweeping?
 
For High temperature Hydrogen attack to occur, it requires some incubation period. Even then, look from that perspective also
 


 
On Tue, Jun 19, 2012 at 5:23 PM, K.M Hrishikesan <hrishikm07@gmail.com> wrote:
 
 
Vessel Description: Reactor
MOC: SA 516 gr 70
Design temperature: 200 deg C
Design pressure: 44.6 kg/cm.sq
Thickness: 36 mm for shell; 50 mm for the dished end
 
Service: Hydrogen environment in the presence of catalyst
 
Above equipment was accidentally subject to temperature run away during Hydrogen sweeping. As a result the temperature shot up abruptly to the range of
700 deg.C. for 15-20 minutes and 450 deg c for approximately a couple of hours.We have checked the hardness which is found to be OK. In-situ metallography is underway.
 
My queries to metallurgical experts are
 
  1. What will be the metallurgical impact on integrity of the vessel due to above incident?

     2. How can we assess the damage/degradation which might have occurred on the  of the vessel in terms of its metallurgy? please suggest some NDE's

 
 
Regards
Hrishi
 

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With Regards,
Sudharsan

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