×
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.

# calculating the combined ring-shell section I'

## calculating the combined ring-shell section I'

(OP)
Hi,

When you try to compare the combined ring-shell sections, the required moment of inertia is I's formula which is straight forward. But when calculating the combined ring-shell section I' - what is the cross sectional area of the shell section contributing to the moment of inertia? Is it the nominal shell thickness (ts) * 1.10*sqrt(Do*ts) or ts minus the thickness required to withstand external pressure * 1.1*sqrt(Do*ts)?

Regards,
Monk

### RE: calculating the combined ring-shell section I'

Might be useful if you would reveal the Code and Part you are working to.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

### RE: calculating the combined ring-shell section I'

(OP)
Section UG-29 of BPVC Sect. VIII Div 1

Regards,
Monk

### RE: calculating the combined ring-shell section I'

Oh, OK, under the nomenclature, I', ts is nominal thickness of the shell. This would normally be understood as with any corrosion allowance deducted.

Note that I' is computed on the composite ring-shell section per the parallel axis theorem with the width of shell section contributing as noted in the definition of I'.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

#### 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!