Sizing the air vent of a American Water Works Affiliation (AWWA) D100 tank is essential to allow correct circulation of water out of the water tank. The water tanks are manufactured with an opening for the air vent piping. The vital part when sizing the air vent is the size of the piping that may connect with the air vent opening on the tank. The size of the air vent piping will fluctuate relying on the placement of the water tank.
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Install the water tank in its permanent location. If your water tank is going underground, set up it in its location but don’t cover the highest with soil.
Measure the distance from the tank vent opening to the roof surface or any floor that will cowl the water tank. If your water tank is not going to have any surface covering the roof, don’t measure something and use a pipe at the very least 4 inches long.
Add four inches to the gap from the tank vent opening to the roof surface. This can give you the minimum height you may dimension the vent piping, as you must provide a minimum of four inches between the roof floor and the vent cap, which can go at the top of the vent piping. To be on the safe aspect, you can add two further inches to your distance, as it will make sure that the minimal distance is met.
Thomson Reuters: ANSI/AWWA D100-96
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