×
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

API650 Center column internal floating roof

API650 Center column internal floating roof

API650 Center column internal floating roof

(OP)
Hi everyone. I'm a new joiner in this forum and I have a question. In our project we have a tank according to API650 with a floating roof and center column (it look weird I know). We erected the tank with Jacking method. And now we will start the IFR work. The first phase is the erection of this central column, and here the question the alignment of this column must be:
- must be vertical according to the roof center ring location regardless its projection to the bottom
- must be vertical according to the bottom center location regardless its projection to the roof
- or I need to take both center (most probably the column will not be perfectly vertical in this case)

I believe the last point is the correct one to avoid that the IFR stuck with the shell. Anyone can confirm.

Thank you in advance

RE: API650 Center column internal floating roof

Quote (Islem le baron (Mechanical))


In our project we have a tank according to API650 with a floating roof and center column (it look weird I know). We erected the tank with Jacking method. And now we will start the IFR work.

I think (and must be) the roof is fixed roof with a central column and there is an internal floating roof..


API 650 limits plumbness to 1/200 . Check API 650 7.5.2 and Appendix H For tanks with internal floating roofs, apply the criteria of this section or Appendix H, whichever is more stringent.

RE: API650 Center column internal floating roof

API 650 requires that the column be plumb within 1/200 of its height (7.5.2) or +/- 3 inches (H.4.5). API 650 Annex H requires that the well in the floating roof be 5" larger than the column, all around (H.4.5).

The most important thing is that the column be smooth (no thick splices), straight (without a bow or kink) and parallel to the tank shell. If the tank leans (which it should not) then the column should lean. If the tank is plumb then the column should be plumb. If there is a choice between being in the center of the tank or being parallel to the tank, the column should be parallel to the tank.

Some floating roofs would have the column well installed in the shop and others in the field. If yours is shop installed, make sure it has or will have the required clearance after the deck is complete. If it is field installed, center it on the column. Many floating roofs would be installed from the side to side rather than middle out but it should not really matter as long as the rim space is correct and consistent (for good sealing throughout the travel of the deck).

RE: API650 Center column internal floating roof

(OP)
thank you guys for your reply. I totally agree with you IFRs about what you said, this is why i preferred in my post to go with the center to center alignment and i will keep checking the distance from the column to the shell for each course before the final welding of the column.

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