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Thank you to everyone for the advice. I used to work with wood and there are span tables readily available, so I was hoping steel would be similar. Obviously there is a lot more to it. It sounds like even though it is a major pain in the neck to do it, it will probably be cheaper to pour another...

I'm trying to avoid a third footing because we would have to get a new permit, dig to 4 foot freeze, customer doesn't want to do it, etc.

Here are more details. The footings are 1'x6' and there are two at 32' on center. The original vessel was 32 feet long. The new vessels are 21'6" long and have support saddles at the ends. I want to bolt down some 32' beams to the existing footings that I can center the new 21'6" vessels on, so...

Hello, I sold a set of gas storage vessels to a company. They poured two footings 32 feet apart to support it. Then they changed their mind and ordered 22 foot vessels. I want to just bolt down some 32 foot w-beams and set the vessels in the middle. Can someone tell me where to find a table...