Ok GUEST,
It’d be better if you sign on and become a member, and provide a little more info about your situation.
However, we are here to help each other, so eventhough you can read many old replys regarding the topic, following is my best shot on your inquiry:
– first at all, you should determine the right amount of water needed to satisfy a good water quench; it is normally estimated considering a coke bed with 0.5 porosity and 55 bulk density; so, if water reach coke bed level before total expected water make, it is a sign of potential hot spot, or in other words, water went up too fast and most likely did not cool coke bed as suppossed to be.
– Another good indicator, and is the one most coker use first, is the coke drum pressure; even if your coke drum temps tells you is cold enough, but your ovh pressure is higher than 5 psig, then it is an indication of a hot spot.
– One last, but not the least, is how your water looks like when draining; it should be as dark as possible; if yellow, means lot of hydrocarbon still embedded and possibly creating hot spots; if steam coming out, rather than water, then it is the best indication of hot spot.
Well, good luck, and let me know if this helped at all.
Lucky
