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If these two pressures are different, the water will be forced to move. And as the graph shows, water at 82 o C is about 1% less dense than the same water at 65 o C. This may not sound very much, but it's enough. The difference in the density of the water in the flow and return pipes is about 10 kg/m 3.
A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere. When a column of waste water flows through a pipe, it compresses air ahead of it in the pipe, creating a positive pressure that must be released so it does not push back on the waste stream and downstream trap water seals.hrough traps, all fixtures are connected to waste lines, which in turn take the waste to a soil stack, or soil vent pipe. At the building drain system's lowest point, the drain-waste vent is attached, and rises (usually inside a wall) to and out of the roof.