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RE: Heater outlet line

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Category: Safety
Date: 07 Aug 2004

The more you push thru the transfer line from the heater to the drum the greater the pressure drop. The greater the pressure drop the higher the pressure in upstream of the drum i.e. the heater tube. When the pressure is high in the transfer line and the heater tube this causes the velocities to go down and the residence time to go up and finally as the residence time goes up the coking in the tubes/transfer line goes up. Now there is an equalibrium that is reached with this -> as the DP goes up the back pressure goes up and the vel go down which then causes the DP to go down – a new equalibrium is reached.

Transferred from the Discussion on August 16, 2004 by the administrator.

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