The existing VRU in a petroleum loading terminal has its absorber vapor outlet line traced. I was not sure of its requirement ( the unit is in Canada, maybe for winterization). the line currently has a steam tracing (1/2" copper tubinh using 150 psig steam) which I have to replace by Electric...
sshep ,
Thanx for your input. The floating roof has 2 venting devices. The one that you mention is generally referred as Vacuum breaker and which is helpful while filling ( when the roof is still on its leg). There is this PV vent as well. I am not very confident if it is the RIM vent or a...
Improving Catalyst is an option. You might also have 2 more points :
Since it is a exothermic reaction : A cooler hydrogen stream can be added between the Two beds . This compensated for lost h2 / increase H2 partial press. and removes some heat.
The liquid hourly Space velocity can be changed...
Does Pressure-Vacuum vent sizing depend on the inbreathing / Outbreathing sizing or evaporative losses. Since the roof floats on the liquid under normal circumstances, how do we size for initial filling and emptying operations.
Thx. in advance
25362 ,
A pretty good calculation on your part......I did the calculation today. The final size I got was for 4" for a 16000 lb/hr flow.Following things were considered.
1)The point between downstream on Steam trap and before the PCV is like a Horizontal Flash Drum
2)5 cases e.g set points...
TBP/Art,
Thx for your replies. I also think on the same lines and was having a great difficulty proving things on paper. My discussion with a Sr.Process Engineer gave the following scheme which I will design tomm. and check if there is a possibility :
The condensate downstream of the steam trap...
Can a Back Pressure valve be designed on a condensate return line to prevent flashing in the line. There is a hotwell downstream on the valve at 0 psig. The condensate is generated by 150# steam @ 360 deg.F .
