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 for small diameter tanks

API 650 for small diameter tanks

API 650 for small diameter tanks

Hello everyone,

My client wants an API 650 calculation note for our tanks (wind, earthquake, transportation, anchor bolt, nozzle load...), as it was defined on tendering phase. However the tanks have a diameter of Ø700mm (height about 1 meter). I tried the best I could to issue such a calculation note but API 650 seems not applicable to such tanks... but I could not find anything to state that API 650 is indeed not applicable and do not issue the calculation note.
Does someone know if I can quote something from the Code that could exempt me from doing this? If not, does someone ever issued a calculation note for such small tanks and how could I proceed?

Thanks in advance.


RE: API 650 for small diameter tanks

That's just a small length of pipe.

Call it pipe storage instead of a tank.


Has the client lost all sense of judgement?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: API 650 for small diameter tanks

There's no reason it couldn't be done. You could work directly with ASCE 7 instead.

RE: API 650 for small diameter tanks

One other thought- API-650 assumes a free-standing tank supported on a tank foundation. If the tank is supported by some other structure, or is in a building, you have some different rules in ASCE 7 that kick in.

The API rules limit the amount of product used to resist seismic overturn to a fraction of the contents, but on a small enough tank, this could reasonably be increased to essentially 100%. The API rules assume that frequency of the sloshing component is low enough to give a reduction in loading, and if this is not the case, you could treat the tank as rigid, without the sloshing- and this is one of the options in ASCE 7.

RE: API 650 for small diameter tanks

If you shrink an API storage vessel enough you end up with a 45-gallon drum.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

RE: API 650 for small diameter tanks

What is the maximum operating pressure ?... API-650 has 2.5 psig.

How will you gain access to the inside of the tank ?

Sr. Process Engineer

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


White Paper - How ESI is Helping Move New Medical Device Product to Market Quicker & More Cost Effic
Early Supplier Involvement has long been a strategy employed by manufacturers to produce innovative products. Now, it almost seems like a necessity. Because decisions made in the design phase can positively affect product quality and costs, this can help add value to OEM bottom lines. This white paper will discuss many facets of ESI, including why it’s so valuable today, what challenges limit the benefits of ESI, how cost is impacted, and more. Download Now
White Paper - Moving to a Driverless Future
This white paper describes what we see as the best practices to support a sustainable engineering process for autonomous vehicle design. It exposes how to use simulation and testing in common frameworks to enable design exploration, verification and validation for the development of autonomous cars at a system, software and full-vehicle level to drive a mature product development process for automated driving. Download Now
Research Report - How Engineers are Using Remote Access
Remote access enables engineers to work from anywhere provided they have an internet connection. We surveyed our audience of engineers, designers and product managers to learn how they use remote access within their organizations. We wanted to know which industries have adopted remote access, which software they are using, and what features matter most. 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