×
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

Valve sizing + heat exchanger

Valve sizing + heat exchanger

Valve sizing + heat exchanger

(OP)
We are trying to size a control valve to feed an heat exchanger.  The inlet pressure is 100 psig for a flowrate estimated at 195 lb/hr.  What is the rule or how can I figure the dP across the valve?  From what I understand, the steam trap will keep the pressure in the heat exchanger.  Should I size the control valve with a dP of 2 psig?

humm...

RE: Valve sizing + heat exchanger

You'll pick the delta-P across the control valve. The higher the pressure drop that you can take, the smaller the valve can be. You're dealing with a very small flow anyway, though.

A steam trap is just an automatic valve. It'll open when it senses air or water, and close when it senses steam. I'm assuming that you're looking to size a temperature control valve on the steam inlet to maintain a given temperature on whatever it is you're heating. This means that the temperature control valve will throttle the steam flow based on the temp it senses. At lower loads, this will give you the same effect as a pressure reducing valve. As the TCV throttles-in, the steam pressure in the HX will fall. You need to select a steam trap with this in mind, and make sure that the condensate can drain by gravity from the HX. Companies like Spirax Sarco, Armstrong, etc can help you with this application.

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