Re: [MW:14605] CS reactor exposed to temperature run away in presence of H2

My dear Hrishi,
In my opinion, for this grade steel this incident has done more good than bad. You have got a tempered steel now, as I can see.
Your metallography results when you have them will surely point it out if you  compare them with the original MTC.
Worry not.
TG

On Tue, Jun 19, 2012 at 4:23 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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