What is the procedure of furnace trip ? Can I try to start again the furnace ? Can I stop the furnace ? How many times Can I Start the coker furnace ? If I try many times I have the risk to fill up part of the coker drum with the furnace “cold” feed. It means the more risk of foaming, decoking problem, increase of coke VCM and safety problems (coke drum opening). So, what would be the procedure ?