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Why are Positive Air Transients created into a DWV system?

April 26, 2017air dwv positive system transients

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Why are Positive Air Transients created into a DWV system?

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A. Fluids discharged into a DWV system, after reaching terminal velocity, begin to swirl inside the pipe, dragging air into the center of the pipe. After the pipe transitions from vertical to horizontal (bottom of the stack or change of directions) a curtain of water is formed. The air hitting this curtain bounces off of it and travels backward through the system.