when i install a p trap can i turn down after the trap as long as i have a short run between my fittings?

Question

by adding pipe between my 90s does that elimanate an s trap

i am building a cup drain on outside of wall with 11/2 pipe i have a 2" main below trap nothing is in the wall i need to get to my wye and 1/8 bend i make a trap travel 4" than turn down with a 90 is this a s trap will it siphone itself?

Answer 1

The main job of a p trap is to hold a "plug" of water as a seal so sewer gasses cannot come up through your drains. As long as the water is held there, you can run your pipes anyway you want.

Answer 2

no. By the way question reads, I don't believe you are at all.
The legal way to run a trap arm(on new construction) is like this.
From the sink drain, the pipe going down is called a Tailpiece. That goes into the P-trap. The trap consists of a dip and wier(the wier is the 90). So you go from the tailpiece to the dip to the wier. Most applications under a sink, use Slip Joint fittings(no glue to seal joints). With a SJ P-trap assembly, the wier fitting also becomes the Trap Arm. So from the dip to the weir(bend), you go into the trap arm. Here is where I think your question will get answered. The trap arm must go into the San-Tee(usually the drain in the wall) without 90ing or dipping down with fittings at all. Maybe, if I am on the right track, all you need is a Tail Piece Extension. that would allow a trap arm to go horizontally straight into the San tee. hope i helped

Answer 3

Not sure what you mean or are trying to do. The problem with S-traps is venting. Without a vent, water in the trap that forms a seal against sewer gas, can be sucked out. I cut the riser pipe below the S-trap and installed a tee. One opening on the tee (side outlet) has a P-trap installed and the top opening has a Studor Vent.