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  2. Drain-waste-vent system - Wikipedia

    en.wikipedia.org/wiki/Drain-waste-vent_system

    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 system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.

  3. Air lock - Wikipedia

    en.wikipedia.org/wiki/Air_lock

    'S' trap inlet to drain [further explanation needed]. The air lock phenomenon can be used in a number of useful ways. An 'S' trap (a pipe that descends from a reservoir, then curves back up, then down again) allows liquid to flow from top to bottom unhindered, and gas cannot flow through the trap unless it has enough extra pressure to overcome the liquid head of the trap.

  4. Drain cleaner - Wikipedia

    en.wikipedia.org/wiki/Drain_cleaner

    Disadvantages of air burst drain cleaners include a limited cleaning range in pipes that do not contain standing water and, in general, ineffectiveness for unclogging blocked main sewer drains. Safety considerations for air burst drain cleaners include a requirement to wear eye protection and, when using an air burst cleaner that uses ...

  5. Here’s what to do if your pipes are frozen as Arctic air ...

    www.aol.com/pipes-frozen-arctic-air-blasts...

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  6. Sanitary sewer overflow - Wikipedia

    en.wikipedia.org/wiki/Sanitary_sewer_overflow

    Power failure, human error, or mechanical failure may cause similar discharge of untreated or partially treated sewage from a sewage treatment plant; but this is typically regarded as a sewage treatment plant malfunction rather than a sanitary sewer overflow. Sewage treatment plants may be designed to capture overflow from malfunctioning units ...

  7. Chemical drain cleaners - Wikipedia

    en.wikipedia.org/wiki/Chemical_drain_cleaners

    The pressure buildup by gas generation can cause weaker pipes to burst, [11] and the heat generation can also soften plastic PVC pipes. Plumbers must take special care to avoid injury when working on pipes which may contain corrosive drain cleaners, and may charge extra for such hazardous work.