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


API 650 standard verses API12D/F

API 650 standard verses API12D/F

API 650 standard verses API12D/F

What's the difference between these two standars/tanks?

I knew 650 is for sotrage tank and 12d/f for production use tank. but still not so clear what's the difference between storage/production tanks.

Should a tank for process facility follow 12d/f not 650 or can be both 12 and 650?


RE: API 650 standard verses API12D/F

Generally, I want to know what kind of tanks should follow API 650, what kind of tanks should follow API 12D/F. Thanks

RE: API 650 standard verses API12D/F

12F is a 'relaxed' 650 for small, truck transportable & shop-fabricated 'production' tanks that sit out in pastures by wellheads.  The 12F design rules do make an acceptable product, that I feel is better than one designed under UL-143.  Nothing wrong with using 12F tanks in a process unit inside a refinery or chemical plant.

I use an upgraded 12F design -- manway rounded at top, not square as 12F allwos -- for small tanks.  If you look in the back of 12F, there is a limit to how large, both height & diameter, something built under the 12F rules can be.

I use a strict API-650 design at 40 to 50-ft and above, and go to an annular ring above 100-ft diameter.

In the area in between, it depends on the product and location [risk exposure] as to how strict or relaxed the design rules I follow are.  API-650 is a 'perverted' standard IMHO.  There are a number of design details forbidden under 650 & atmosphereic pressure that are fully acceptable on a ASME VIII design at 100 psig.  Just doesn't make good engineering sense, and if you conservatively use good engineering design, you will build a good tank.

Conversly, if the calc's 'just don't look right', you are about to make a big mistake.

RE: API 650 standard verses API12D/F

Duwe6, thanks for your clear explanation!

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!


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