×
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.

# HEX U-Bends under external pressure

## HEX U-Bends under external pressure

(OP)
thread794-256857: Heat Exchanger U-bend Under External Pressure

Hi all,

Is it really necessary to calculate the external pressure of U-Bends? Can we assume the U-bends are self-stiffened as it is joint to the straight part of tube, so the weakest part is the straight long tube?

If we use TEMA RCB-2.31 I have seen many calculator programs (AutoPIPE Vessel) showing the formula to = t1*(1 + do/4R), but I cannot understand how the t1 is given in relation to external pressure.

Or is TEMA formula using t1 only considering the U-bends under internal pressure?

Main question is how to calculate the required thickness of U-bend under external pressure using EN13445 + TEMA?

Many thanks.
LG

LPSG-Engineering Solutions
Mechanical Engineer
Portugal-Setubal

### RE: HEX U-Bends under external pressure

See Toroidal shell in “Roark's formulas for stress and strain”.

Regards

#### 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!