Flash Tank Question.

[murphymok]

Hi,

I have a flash tank that requires daily draining through a drain line. The piping is as follow: one 70 psig condensate inlet line, one venting line to a safety valve, one outlet line to a FT trap set and an manual draining line at the bottom. Do I need to drain the tank regularly? Or will the FT outlet drain will do the same job? Will the tank overflow?

Thanks in advance.

MM

 

[Joesteam]

The tank should drain through the trap. The height of the trap vs. the overflow and the capacity of the trap and amount of condensate will dictate if the tank will overflow. It is normal for most flash tanks to establish a level of water in the tank.
It concerns me that you have the vent to a SRV. Are you using the low pressure steam? Where does the flash go?

 

[25362]

For variable and widely changing throughputs a liquid-level control valve (LLCV)is generally used to maintain a more-or-less constant level in the flash drum.

 

[murphymok]

To Joesteam,

No, the flash steam venting to the outside. A safety valve is at the venting line.