Thanks Mr. Jignesh, Sudarshan and Manpreet for your valuable inputs..
H2 pressure was approx 20 kg/cm.sq during exotherm inside the vessel.
On Thu, Jun 21, 2012 at 11:49 AM, manpreet <manpreetsin88@rediffmail.com> wrote:
Hi,
I respectfully disagree that @ 450 Deg C for 2 hours will do any good, at this temperature there are high chances of graphitization to occur for Carbon Steels, that is the reason Cr-Mo steels are used for elevated temperatures.
Metallography will reveal the presence of any graphite, also Mechanical testing should be carried out to assess any degradation of mechanical properties.
Regards,
Manpreet Singh
On Thu, 21 Jun 2012 10:52:09 +0530 wroteOn Tue, Jun 19, 2012 at 4:23 PM, K.M Hrishikesan wrote:
>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
Vessel Description: ReactorMOC: SA 516 gr 70Design temperature: 200 deg C
Design pressure: 44.6 kg/cm.sqThickness: 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
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
RegardsHrishi
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