650

[JSPCGY]

It is determined that a storage tank designed per API 650 requires anchors.

Looking at Appendix B of 650, We can use concrete ring wall or concrete slab.

My civil engineer wants to save cost of concrete. He is proposing that we should simply use earth anchors made by Manta Ray (

http://www.earthanchor.com/mantadraw.html).

This will be much cheaper.

Is this acceptable ? Are there any pros and cons ?

Is it required that we must use a ring wall foundation if a tank requires anchors.

Thanks for your anticipated reply.

 

[jte]

JSPCGY-

You have experience with insufficient foundations: thread1452-260793

Do you really want to not use any foundation to save a few bucks worth of rock and cement?

Are you working directly for the owner/user (and will have to suffer the problems of this tank for years) or are you with an E&C firm (and will walk away from the problem at the end of the project)?

Is this an MBA driven issue?

jt

 

[IFRs]

What are your anchor loads? Soil conditions? Model of anchor?

 

[JStephen]

Take a close look at the wording in API and see if they actually specify that an anchored tank must be on a concrete foundation. If so, then your response is, "It can be built that way, but will no longer meet API-650", which will likely not be acceptable.

My concern with the installation would be that after several years of service, the tank would have settled several inches, leaving lots of slack in the anchor bolts. A dynamic hammering of the anchor bolts under wind or seismic loading is not the condition designed for.

 

[sdz]

If you require anchors then I would assume the edge is lifting and creating high bearing on the other edge. This would suggest that a concrete ring beam would be required.
Can all the design assumptions of API650 be met without a concrete ring wall?

 

[MJCronin]

JSPCGY-


When you contacted the "Manta Ray" anchor bolt people, did they state that anyone else has used thier products to anchor tanks ?

Or will you be the first to use the anchors in this way ?

Do you really want to be the first ?

-MJC