×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Complete Drainage of Storage Tank

Complete Drainage of Storage Tank

Complete Drainage of Storage Tank

(OP)
Greetings
We are designing a Fuel Oil Tank
ID= 220 ft
H= 64 ft
Roof: Structurally supported cone roof
Bottom: Apex up, 1:120 slope (center is higher than periphery)

We are having a problem with the tank drainage:
The client request the complete drain of Tank in case of maintenance: to accomplish this, we suggested 4 draw-off sumps of 6" each nozzle.

1) How close can the sumps be between them?
As drainage lines are steam traced, they cannot be underground by Project Specs, given this situation, we have considered to gather all 4 drainage lines (and sumps) as close as possible not to interfere with other shell connection between drain nozzles

2) Is it possible to put more than one pipe inside a sump?

3) Table 5-16 of API 650 establishes NPS 6" as maximum, but paragraph 5.8.7 gives an open window to the purchaser, could be installed a single drain nozzle of 12"?

Thanks

RE: Complete Drainage of Storage Tank

I don't think there's any reason you couldn't use a larger drawoff line in a sump. I don't recall the wording of API-650, whether the standard sump sizes are the only ones allowed or whether other/larger sizes can be used.

RE: Complete Drainage of Storage Tank

Clause 5.8.7 says indeed 'shall be....unless specified otherwise by the Purchaser'. That is, you may install a single drain nozzle of 12", provided all the associated engineering is done correctly.
Cheers,
gr2vessels

RE: Complete Drainage of Storage Tank

(OP)
Thanks for the clarification, but I'm a little concerned about the sump dimensions and if that could affect somehow the construction of the foundation, or the settlement
I'm not too familiarized with the construction process, is the sump constructed during foundation or after foundation is done?
This I ask in order to tell Civil discipline to consider this or not and if it is in vendor's scope of supply
Thanks again for your help

RE: Complete Drainage of Storage Tank

"...is the sump constructed during foundation or after foundation is done?"

It depends on the foundation type and how you design it. For example, if you have a full slab foundation, obviously you must install the sump with the slab. There are other factors as well.

RE: Complete Drainage of Storage Tank

(OP)
Greetings fegenbush
This Tank has a concrete ringwall and compacted soil

RE: Complete Drainage of Storage Tank

The full description of sump installation is in the 'Note' of figure 5-21. However, the tank installer only need your As Built drawings, let him do the job...
Cheers,
gr2vessels

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!


Resources