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Re: Buried LP tank
A reminder - if you are in a flood zone, that underground tank will float when flooded over if it is not counter balanced down.
Most requirements are either anchors or concrete pads with enough uplift resistance / weight to keep an empty tank down.
Let's say you have a 250 gallon tank, that means it would hold 250 gallons of water, which means it displaces 250 gallons of water, which means it displaces 1870 pounds of water (I believe water weight 7.48 pounds per gallon), and if the tank weighs in at 470 pounds empty (just a guess), then the tank needs to be anchored down to concrete which weighs at least 1400 pounds. That would be two footings (running under the tank perpendicular to the tank, not parallel alongside it) approximately 1 foot by 2 feet by 10 feet long.
If the footings ran alongside the tank, each would need to be approximately 2 feet by 2 feet by 10 feet long as each would need to restrain the entire displaced water weight.
Or just a 4 foot by 6 inch by 10 foot slab below the tank with the tank anchored to it.
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