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!

*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.

Jobs

Recomended maximum outlet cooling water temperature

Recomended maximum outlet cooling water temperature

(OP)
Dear colleagues, Does anyone know of a written document / specification /reference for avoiding cooling water outlet from shell and tube exchangers above 120 F? Scale formation at this temperature occurs, but it is not easy to find a reference document / specs supporting this fact. Thanks

RE: Recomended maximum outlet cooling water temperature

My reference is the company design manual, which says 40-48oC depending on which plant it is around the world.

Good luck,
Latexman

To a ChE, the glass is always full - 1/2 air and 1/2 water.

RE: Recomended maximum outlet cooling water temperature

You can always check by taking some typical water analysis and checking the scaling limits.
I am familiar with people using upper limits in the range of 45-50C.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: Recomended maximum outlet cooling water temperature

If it is discharged to a sewer or if the drain pipe is unprotected then there is also the OSHA limit of 60 C ( 140 F) , to prevent injuring workers.

"Nobody expects the Spanish Inquisition!"

RE: Recomended maximum outlet cooling water temperature

What matters more than cooling water outlet temperature is exchanger tube surface temperatures on the cold side, and the composition of the water.

Some minerals start to drop at 60 C. Most minerals that are of concern for fouling are dropping like a rock at 80 C.

Obviously the type of water matters greatly. If it's closed loop cooling water where the water quality is monitored and treatment is maintained properly, you may be able to push the limits. If it's condensate, as long as you can handle the steam being generated you can ignore the limits, more or less. If it's raw water from a river or lake or worse still a well, look out- you could be in trouble with a water exit temperature of 40 C depending on what's in there.

RE: Recomended maximum outlet cooling water temperature

Quote:

If it's raw water from a river or lake or worse still a well, look out- you could be in trouble with a water exit temperature of 40 C depending on what's in there.

If zebra musses are a problem, warmer outlet temperatures can greatly discourage their taking up residence.

CR

"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]

RE: Recomended maximum outlet cooling water temperature

...but they'll still be happy to live at the inlet...

RE: Recomended maximum outlet cooling water temperature

Perfect. Gather them all in one spot so they are easy to eradicate. Win Win.

"Formal education is a weapon, whose effect depends on who holds it in his hands and at whom it is aimed." ~ Joseph Stalin

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


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close