Immediately beneath a sink bathtub or other plumbing fixture the fixture drain opening leads to a curved segment of pipe known as the p trap which is normally a 1 1 4 to 2 inch diameter segment of pipe with a sharp curved bend in it shaped like the letter p.
Basement floor drains diagram.
The diagram at right shows a p trap which can be found at sinks showers and bath tubs.
If the drain must discharge into the sewer line the drain should be fitted.
The horizontal soil pipe can continue on now until it has reached a point for the basement floor drain.
The purpose of this drain trap is to hold standing water which seals the drain system and prevents sewer gases from.
Basement floor drains don t get a lot of attention until the sewer backs up or the basement smells like an outhouse.
It is best to have a floor drain flow out to a dry well rather than into the sewer line.
This should not be installed however unless it is absolutely essential.
The floor drain has an area which bypasses the trap.
Floor drains are most often installed during original construction often in the utility area to drain away excess water in the basement.