×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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.

Students Click Here

Cross-Sectional Area of Cone

Cross-Sectional Area of Cone

Cross-Sectional Area of Cone

(OP)
What is the equation for calculating the Cross-Sectional Area of the Cone?
As per 5.10.5 & 5.10.6, Cross-Sectional Area of Cone is required to be compared with the Participating Compression Area (hatched area calculated from Figure F.2).

Mohd Yaseen

RE: Cross-Sectional Area of Cone


I think Figure F-2 ( Permissible Details of Compression Rings ) is self explanatory ..

the width of roof area participating the compression area ( except detail i )

wh = maximum width of participating roof
= 0.3(R2 * th)**0.5 or 300 mm (12 in.) whichever is less.

If the tank subject to external pressure ( vacuum ) then look app. V

RE: Cross-Sectional Area of Cone

(OP)
Dear HTURKAK;

Figure F.2 (shaded area) is used to calculate the Participating Compression Area.
I am looking for calculating the Cross-section Area (my resulted detail is detail i)?
Specifically, can elaborate how to calculate this Cross-section Area as referred to 5.10.5 & 5.10.6 (API 650 edition 13th).

Mohd Yaseen

RE: Cross-Sectional Area of Cone

The equation in 5.10.5 is the minimum required area at the roof-shell junction. The shaded area in Figure F.2 is the available area, and must be greater than the minimum required area.

It may be that 5.10.5 and F.2 are not consistent in their naming, but this is the meaning.

Geoff

RE: Cross-Sectional Area of Cone

(OP)
Dear Geoff13;

You replied that the shaded area in Figure F.2 is the available area (Participating Compression Area as stated in F.2.2) must be greater than (or equal) the minimum required area (Cross-sectional Area as stated in F.2.2).

Ok, let us come to statement in 5.10.5.2 that given equation (P D^2/8 Fa tan θ) about the Nominal Material Thickness – Any Corrosion Allowance ONLY & Nothing mentioned about the Cross-sectional Area. Here is the question?

I guess some wording or typing mistake in my edition as its very clear in the pervious editions (see attachment).


API 650 13th;
F.2.2 Required Compression Area @ Junction shall be calculated as in F.5.1
Participating Compression Area @ Junction shall be determined by Figure F.2.
For Self-Supporting Roofs:
Compression Area shall be ≥ Cross-sectional Area calculated in 5.10.5 or 5.10.6 as applicable.

5.10.5.2 Participating Area @ Roof-to-Shell Joint shall be determined using Figure F.2 & the Nominal Material Thickness – Any Corrosion Allowance shall be ≥ P D^2/8 Fa tan θ.

Mohd Yaseen

RE: Cross-Sectional Area of Cone



(5.10.5.2 The participating area at the roof-to-shell joint shall be determined using Figure F.2 and the nominal
material thickness less any corrosion allowance shall equal or exceed the following:
where

A= p*D2/(8 *Fa* tanθ )

This formula is for calculation of the minimum required compression ring cross section area. The area determined using Figure F.2 ( with net thickness = thickness - CA ) SHALL NOT BE LESS THAN THE AREA CALCULATED BY ABOVE FORMULAE !!

RE: Cross-Sectional Area of Cone

(OP)
Dear HTURKAK;

Thanks, its clear now.

Mohd Yaseen

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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