LINES CONNECTED TO COKE DRUM

To all members in this forum

I would like to get advise on the special stress analysis requirements for lines connected to the COKE DRUM in a COKER PLANT.

Regards

It depends on which type of Coker Drum and location of pipe system, i.e. overhead or bottom piping....Is it delayed coker ? or B2B coker ?
You can get all operating sequences from a licensor in basic design package.

It is delayed coker and it is bottom piping.

Any special consideration?

Regards

FOR BOTTOM PIPING JUST CONSIDER DISPLACMENT
NOTHING ELSE
FOR TOP NOZZLE YOU NEED TO CONSIDER BANANA EFFECT IN OTHER WORDS THERE IS THERMAL DIFFERENTIAL ACROSS THE DIA. OF COKE DRUM WHILE COOLING COKE DRUM SO TOP NOZZLE WILL MOVE IN ANY DIRECTION


BYE

I had worked on Delayed Coker Plant of IOCL, Panipat. There I had seen that the supporting arrangement of the coker drum is from the bittom and the bottom portion is not allowed to move as the telescopic chute gets connected to that for the handling purpose. I agree with Mankotia, for this case, you have to consider only the displacement, not the thermal expansion of the drum.

One of the biggest problems with piping connected to coke drums is accomodating the random movement of the top of the coke drums due to temperature gradients accross the drum during the coking process. These gradients can cause the top of the drum to move considerably in any horizontal direction, perhaps 200mm. This event needs to be allowed for with the design of all the top piping. Dont tie the drums together with stiff piping. There will be considerable vibration associated with the overhead lines due to density changes in the medium. This means they need to be held properly, but this always conflicts with the need for flexibility to allow the drums to move independantly. Be very careful with this.

Any special suggestion on retrains on riser pipes?, Any specific type or model for horizontal restrictions?

Thanks a lot,