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Steam Condensate Drain Options

condensate drain loop seal drain flash tank restricting orifice pressure break down orifice

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#1 SaiKrishnaN


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Posted 11 June 2020 - 05:25 AM

Hello everyone,

  I have a steam condenser operating at 1.5 bar (a) pressure. I need to drain the condensate to power plant hot well (at around 8 kPa(a) pressure), while maintaining minimum condensate level in my condenser for achieving required subcooling. I would like to know methods for achieving this,

following are options i am considering with my knowledge. please enlighten me with your opinions.

1. loop seal. 

        > seems to be very tall like 15+ meters. 

2. pressure break down orifice/restriction orifice kind of thing

3. discharging to turbine cycle drain flash tank


Are there any other ways of achieving this? any compact solutions?


Thank you

#2 breizh


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Posted 11 June 2020 - 05:53 AM



Hi , 

consider this technology , link above .

Let you try your favorite search engine  , key words : Condensate recovery

Good luck


#3 katmar


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Posted 19 June 2020 - 03:57 AM

Maybe I am not seeing the complexity, but it seems to be a typical steam trapping application.  The trap needs to be put at a level to give you the liquid level required for sub-cooling and there must be a pressure balancing connection to stop the condensate siphoning through the trap.


In my opinion the biggest challenge will be the condensate piping from the trap to the hot well.  Because of the significant pressure difference between the condenser and the hot well there will be a great deal of flash steam generated and the piping should ideally be sloped all the way down to the hot well so that the steam and condensate can easily drain. I would be quite conservative with the sizing of this line - make it plenty big enough.

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