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dig1, Thanks. I think that's the way we will have to approach this.

dig1, Yes, we can install an outer bolt circle and can reduce our loads some due to the additional moment arm, but it's just not enough. One thing we are considering to get around the ACI 318-14 Paragraph 17 is to do on site testing of the post installed anchors to get empirical results. I'm...

It's a skirt ring support, so we have to create a new ring further out. But even adding more anchor bolts and a larger bolt circle, the anchor bolts have too much break out area overlap.

We keep getting concrete breakout failure due to the ACI 318-14 reductions for post installed anchor bolts

Yes, the foundation is adequate.

No guy wires. That's not allowed the way the process piping is on the vessel.

Sorry, I have been out of touch on this. The issue is that the vessel is approximately 300ft tall and wind is the governing load. The original design was in the 1950's and most likely would not meet today's standards. Concrete pull out is the governing problem with anchor bolts spaced...

Thank you all for the responses. Unfortunately, we had considered these options, but the configuration and size of the vessel and anchor bolts prohibits this. I was hoping someone had experience with multiple anchor bolt circles to allow for enough post installation A.B.'s.

I am working on a vessel tower project for an existing vessel that has corroded anchor bolts. It is impossible to replace the anchor bolts, so we are considering post-installation of anchor bolts and adding to the baseplate/chairs. The pile cap is very large and available for additional anchor...