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RE: Main tower coke build up

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If I understood  you  said  that the system do not work very well . what that means it?  is  not removing coke? the line from the bottom of the tower  to the filters is kept hot? what kind of emergency valve is installed at the line ( butterfly?), what is the diameter of that line (8 “?), If you are going to perform   a scanning on the bottom  keep in mind what Kind of radioactive source are going to use because some source can not differentiate between  liquid and coke unless it considers that this stuck on the wall

In one of our units we had  a problem of loss of coke removal and low temperature in the line, after conducting several tests (including scanning) determined that the butterfly valve (emergency) had an internal obstruction with stones coke

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