×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Condensate Lines

Condensate Lines

Condensate Lines

(OP)
I have a question about line list conditions for condensate lines. Say that there is a 50# saturated steam line, and steam trap, and then a condensate line that is feeding into an open sewer. I have seen two types of conditions listed for the condensate line. One way shows the condensate line with normal operating conditions of 0 psig at 212 F. The other method uses the normal operating conditions of the saturated steam line, 50 psig at 298 F. Which of these conditions would be the correct ones to use? Thanks for the help!

RE: Condensate Lines

Assuming the condensate line is sized properly such that the line losses are minimal, the pressure downstream of the steam trap is essentially atmospheric so the condensate will be a two phase mixture at 0 psig and 212F.  If the atmospheric portion of the line is long then I might allow 10 psi or so as the operating pressure along with the saturated steam temperature.

The pressure is really immaterial since both lines will be class 150 piping (at least in my field, we never use anything less than class 150 for condensate).  The only difference between using 212F and 298F is the amount of flexibility allowed in the piping design.  It's not an issue if the trap discharges obviously into a hub but if you run a few hundred feet, it can affect how much growth is allowed.

RE: Condensate Lines

Depends on the type of trap that you are using.  Some traps operate such that they sub cool the condensate approaching the trap to prevent or minimize flashing.  Others pass the condensate a or very close to saturated steam temperatures (in the main line.)  You need to know the temperature of your condensate coming across the trap.  The rest is basic thermodynamics.

rmw

RE: Condensate Lines

Good point RMW.  

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources