In Ethylene Glycol unit, recently we have decided to route the vaccum condensate of PGU Refining column two stage ejector system to an existing vessel, which is having a spare nozzle at the bottom of the vessel. The vaccum required in the column is 49 mmHg. The vertical distance between condenser and vessel is 17.3 meters. Vessel operating pressure is 10PSIG. Including vessel liquid hieght, the back pressure is coming as 1320 mmHg. At present, There are two barometric legs, one from each condenser going to OWS. We would like to reroute the streams into the vessel.
I have gone through the article by P.D. Hills (Designing Piping for Gravity Flow). In that it has written that "To avoid having the liquid carrying forward, adequate free area must be left in the pipe to allow gas to pass backward". I would like to know what is the minimum gap to be maintained for this.
The vaccum condensate flow rate is about 250 kg/h. From both the condensers 11/2" self venting lines (slope of 1:200) have been proposed and they will connect each other at grond level, after that with an expander 11/2" to 3", a loop seal of 3" has been proposed of 1m height and finally it gets connected to vessel bottom (11/2" nozzle with 3" X 11/2" reducer). This is the schematic. I would request you to validate my scheme, whether it works or not?
Thanks.
I have gone through the article by P.D. Hills (Designing Piping for Gravity Flow). In that it has written that "To avoid having the liquid carrying forward, adequate free area must be left in the pipe to allow gas to pass backward". I would like to know what is the minimum gap to be maintained for this.
The vaccum condensate flow rate is about 250 kg/h. From both the condensers 11/2" self venting lines (slope of 1:200) have been proposed and they will connect each other at grond level, after that with an expander 11/2" to 3", a loop seal of 3" has been proposed of 1m height and finally it gets connected to vessel bottom (11/2" nozzle with 3" X 11/2" reducer). This is the schematic. I would request you to validate my scheme, whether it works or not?
Thanks.