The condensate flash drum is atmospheric, and steam users are working at 5 bar g.highest point on rack is 10 meters so there is no problem with water column head. The same condensate header collects MP steam traps discharge (30 bar g),but MP steam is strongly superheated (120°C) so that expected...
In fact for flare headers slope is a typical requirement for DEP shell, for example.
For steam condensate is preferred, if possibile, but is not unusual see condensate return line at lower level of pipe racks, rising for road cross.
With reference to steam condensate lines design, I would have your opinion about this matter.
If line are proper designed for two phase flow according the maps (let's say annular/wave or bubble flow) there is any risk of slug flow?
For a steam condensate line be free draining is mandatory or it...