[ashok singh]

Karthik,
Sometimes i think these problem are mine and Karthik is not with us. same sound happened in our drums also,I think it occured due to thermal gradient.
 
Best Rega?rds
 

[ashok singh]

Karthik,
Lummus design Cokers having same problem i.e. flaring from Blowdown overhead receiver during vapor heating as well as water quenching. I believe there are three PVs in your B/D overhead receiver i.e. one to flare,second for FG make-up and third to Fractionator O/H system for recovery.
To avoide above problem you can try the following options which are drastically reduce your flare losses:
1- Check the line throughness of Blowdown overhead receiver to u/p of fractionator O/H   condensers.  Also check for any loop formation in that line which cause the water seal and restrict the flow towards Fractionator O/H system.
2- Increase the B/D pressure slightly higher say 0.7 Kg/cm2 than Fractionator O/H, it facilitate all gases goes to Fractionator O/H rather than flare and it does not affect your vapor heating as you have sufficient time for vapor heating.
   
Best Regards
Ashok singh

[ashok singh]

I think your Coker is licensed by M/S CBI & Lummus. They have provided the refractory lining on the collector tray below the shed-deck or packing for safeguard of tray in view  the condensation of  coke drum vapors. This is the old design concept and having following major demerits :
1- Curing of the refractory inside the column is major concern
2- There may be chances of refractory get damaged & dropped in bottom, it can be affect  the Heater charge   pump.  
 
In Foster Wheeler and other licensed Coker ,the trays are reliable with metallurgy SS410 and there is no provision for refractory lining.   

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