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

water drawoff sumps of API-650 tanks

water drawoff sumps of API-650 tanks

water drawoff sumps of API-650 tanks

I would like to know how many water drawoff sump pits should be provided for above ground storage tank (150 FT diameter, 70 FT height, 200,000 BBLS capacity, design temperature 70 C). The tank will be constructed as per API-650.  The product is Gasoline and tank bottom is designed to concave up in the center when the tank is full of products (periphery will be lower than center of bottom plate)

I appreciate any advice from  API-650 experts, thanks.      

RE: water drawoff sumps of API-650 tanks

Dear Hello/Good Afternoon,
Kindly do Check first if Height Vs Diameter ratio is within safe limits as per API 650 Etc.

Best Regards

RE: water drawoff sumps of API-650 tanks

This is an owner / operator preference.  I would think (4) would be typical.  No less than three.  


RE: water drawoff sumps of API-650 tanks

API-650 is silent on this question.  No requirements per code.  You could have none, you could have 12.  It is, as stated above, an owner / operator preference.  One way to look at it is to put one near each shell manway - how many shell manways are there?  If you are going to recirculate using piping to the sumps to feed the pump, the hydraulics of the situation might help you decide.

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


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