×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

# Maximum velocity for the Dowtherm A

## Maximum velocity for the Dowtherm A

(OP)
Hi,

I would like to know what is the maximum velocity for the thermal fluid (Dowtherm A).

About the recommended velocity for this fluid? Is there some range?

work temperature: 250 - 230°C

I am chemical engineer and I am designing a thermal system. The problem is:

If I use tube of (6 in): velocity is 1.3 m/s

If I use tube of (4 in): velocity is 3.04 m/s

If I design the tube with (4 in) , the velocity will be high but the inventory must be smaller than if I put a tube if 6 in

Thank you!

### RE: Maximum velocity for the Dowtherm A

I used to have an old Dowtherm reference book that had some guidelines but I don;t recall if suggested system velocity was included. Check the Dowtherm site and the reference book?

### RE: Maximum velocity for the Dowtherm A

I'd check with Dow, I've had good success with someone actually reading and responding to questions put in through their website.

3 m/sec isn't something I would typically exclude as being too high velocity for something like this. It's a clean fluid so erosion isn't really a concern.

How long is the piping, how much does the additional pressure drop with the 4" line make on your circulation pump, has the client imposed any limits? As you've found out in the smaller piping sizes, a line size can make a pretty big change in velocity and pressure drop.

#### 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.

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!