Aboveground storage tanks must be adequately vented to respond to pressure fluctuations due to temperature change. On a hot day, tank vapor pressure could reach a dangerous level if vents are too small, clogged with dirt or sealed to prevent evaporation loss. In Indiana a 1.5-inch diameter vent pipe is needed for small tanks (up to 275 gallons), increasing to 3 inches for large tanks (900-1100 gallons).
[Note -- Some states may have other venting requirements for aboveground storage tanks - check with local authorities.]
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