Main FCC column bottoms - Slurry row oil exchanger

[0707]

On our FCC unit we have two shell & tube heat exchangers in series. On tube side we have the bottom product of the main column (hot fluid). On shell side we have the slurry row oil (cold fluid).

Hot fluid goes in at 360º C and out at 182ºC.
Cold fluid goes in at 107ºC and out at 260º C.
Hot fluid pressure 8.3 Barg
Cold fluid pressure 13.2 Barg.

Does anybody from the forum experience tubes leaking in these exchangers? Does the tubes got plugged with coke formation? After shutting down for repair the leakage how long it takes to clean the bundles?

Any feed back from the forum on this subject would be appreciated

Luis

 

[LuizSouza]

Luis,

Let's suppose your tube is 3/4" O.D., 20' long, depends of the hardness of the coke you've to use a drill and after you've broke the mechanicall resistance it'll gonna 4-5 hr a tube.For full cleaning you need to hydroblasting too.

Hope it helps.

Luiz Souza
Brazil