×
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

expansion tank placement

expansion tank placement

expansion tank placement

(OP)
Where are expansion tanks typically placed in a closed system? hot side or cold side? any one have good rules of thumb for placement of diaphragm expansion tanks in a system containing a pump, heat source, and heat exchanger?
thank you.

RE: expansion tank placement

(OP)
I've seen some references saying the cold side since it has a lower pressur and installing on hot side shortens life of diaphram expansion tank???

vpl? do you know reasonings for the above placement?

RE: expansion tank placement

In the system shown in the drawing, I believe the reason is to maintain a constant pressure in the system.  And, tbh, the expansion tank shown is not a diaphragm expansion tank.

Unfortunately the agency website -- that shows all the various permutations where expansion tanks are used -- is currently off-line for maintenance.  So I can't readily find other examples.

I'll poke around, but it'll be a bit.  I'm kind of busy today.

Patricia Lougheed

******

Please see FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.

RE: expansion tank placement

(OP)
anythoughts on the relation to the pump? ie discharge or suction side?
 

RE: expansion tank placement

That depends upon the pump. A simple sketch of your closed system would definitely help. Hot side makes the tank more expensive. That's for sure. But gas (with or without diaphragm) expands at higher temperature. That must be considered, too. So, I guess there is no answer for all possible systems but it must be checked what the best installation point for your system with your pump is.

RE: expansion tank placement

the size of the expansion tank is defined by the amount of expansion required.this depends on max and min temperature and the volume of the liquid:
high level-low level expansion tank=volume liquid on maximum temperature-volume liquid on minimum temperature

if the suction of the pump is connected to the bottom of the tank (liquid header) the system can be vented on the highest points (after the pump, simply by running some small diameter pipes to the top of the expansion tank.

when connected in such way (liquid header)the pressure requirements for the header tank (or elevated height in case of atmospheric tank) is the lowest.

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