On Joining PVC Pipes

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There are usually many many pipes in a building, and because PVC is cheap and (mostly) long-lasting, it is going to be used for quite a portion of it. For example, sanitary pipes are mostly PVC, rainwater pipes could also be PVC. Here is how PVC pipes are joined together:
To join 2 PVC pipe parts together, one part needs to have a larger circumference than the other so that a portion of one pipe could fit into the other one snugly (a male and female joint). When joining, the joining edge of both pieces are first thoroughly cleaned of debris, then applied with a primer. The primer, a viscous liquid, is coated around the area intended to be joined so that it "bites" the micro-surface of the edge so that it becomes a little more rough. Subsequently, when this primer sets a little (in probably less than a minute), a second liquid, the glue, the applied over the area where the primer has been applied. Then, the pipes are immediately joined and a half twist is done to ensure the glue applies evenly. Within the next minute, the pipe is set in place, and it will be fully cured in the next few hours. The glue creates a chemical reaction that actually "burns" and melts the area it is applied to. As such, by joining the pipes together then, the melted surface bonds together to form a well joined edge.
For more information, I recommend this video:

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