Connections to horizontal drain lines should be made with wye (Y) fittings. The fitting called a “ Sanitary Tee ” looks like it could do the job, but it doesn’t. A sanitary tee cannot be laid on its back, horizontally: It is shaped differently than the wye and should only be aligned vertically, or it may block up.
Full Answer
Can a Wye lay on its side?
Horizontal Drains Can Combine Through Wye Laying Flat, Or Can't They? Bookmark this question. Show activity on this post. IPC TABLE 706.3 "fittings for change of direction" says wye is okay for horizontal to horizontal.
Can I use a sanitary tee on its back?
When using sanitary tees they may not be installed on its back with the side opening in a vertical position. The purpose for why this is not good is that when the waste hits the bottom of the horizontal pipe it will splash back upstream in the horizontal pipe.
Can you use a wye vertically?
Connecting a trap to a vertical drain with a wye fitting and a 45-degree elbow seems like a good idea. But it's not. As water drains down the steep slope at the wye, it can create a siphon effect such that water will be sucked out of the trap. And the empty trap will allow sewer gas to flow into your home.
Can a double wye be installed horizontally?
A double-wye fitting may be used in horizontal drain lines.
What is the difference between a sanitary tee and a Wye?
Although a wye or tee may superficially appear to perform the same job of redirecting flow by 90 degrees, their performance is not the same. In a wye or long-sweep 90 the flow is positively directed in a specific direction. But in a tee there is not a smooth flow transition at the junction.
Can a sanitary tee be used horizontally?
Sanitary tees may only be used on drainage piping when transitioning from horizontal (1/4” per foot) to vertical. All others must sweep in direction of flow with proper drainage fittings.
Can you put a 90 in a sewer line?
It's fine to have a larger-radius (sweep) 90-degree bend at the base of a vertical drainage stack where the wastewater starts to travel horizontally. It's also a good idea to have a sweep 90-degree fitting where a drain pipe pops out of a wall for a kitchen, vanity or laundry sink.
Can you put a combo vertical?
This is a sanitary tee and can only be used as shown in the vertical orientation. They are only used to go from the horizontal to vertical plane.
How do you install a wye fitting?
0:005:23How to add a wye fitting to a horizontal PVC drain line.(2021) - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo take our wide fitting put it where you want it to go and you don't want to mark the end of theMoreSo take our wide fitting put it where you want it to go and you don't want to mark the end of the hub you want to mark the base of the hub where the pipe would bottom out.
Can you use a wye for venting?
Absolutely! Most any fitting is perfectly acceptable and legal, just don't use any reducers, caps or traps in the venting.
What is a double wye used for?
Double Wye HxHxHxH Installed in a vertical PVC DWV piping system to allow for a smooth transition from two horizontal branch lines into the vertical drainage line. Often used with a threaded fitting cleanout adapter and plug, to allow access to the piping system.
Which way does a sanitary tee go?
If you are using a sanitary tee to go from a horizontal vent pipe into a vertical vent the correct orientation is "upside down" from its normal usage. The curve of the tee should go from the horizontal direction curving up toward the roof.
Can you stack 2 sanitary tees?
You cannot use either one. You either stack two tees, which makes one drain lower than the other, or use the approved double fixture tee which is something about halfway between a cross and a double Y or double combination Y-1/8 bend, which is also illegal.
Can you use a wye for venting?
Absolutely! Most any fitting is perfectly acceptable and legal, just don't use any reducers, caps or traps in the venting.
What is a double sanitary tee used for?
PVC DWV Double Sanitary Tee (Double TY/Cross) All Hub. DWV is used for non pressurized sanitary system Drain, Waste, and Vent.
How does a sanitary tee work?
0:273:18RVIA Webinar 2019 - Plumbing Drain System: Sanitary Tee FittingsYouTubeStart of suggested clipEnd of suggested clipIndustry sanitary tees are used to connect the trap arms of sinks showers. And washer stand pipes toMoreIndustry sanitary tees are used to connect the trap arms of sinks showers. And washer stand pipes to the vertical drain lines. Making this connection with a sanitary tee.
What is the difference between a sanitary tee and a Wye?
Connections to horizontal drain lines should be made with wye (Y) fittings. The fitting called a “ Sanitary Tee ” looks like it could do the job, but it doesn’t. A sanitary tee cannot be laid on its back, horizontally: It is shaped differently than the wye and should only be aligned vertically, or it may block up.
When can you use a sanitary tee?
A sanitary tee should be used when connecting a horizontal run, such as a waste arm to a vent stack or vertical riser. “ If you think it’s expensive to hire a professional to do the job, wait until you hire an amateur.”
What is a wye used for?
A standard wye is a Y-shaped fitting which allows one pipe to be joined to another at a 45° angle. A wye may also be used to split a branch line equally in two directions, such as the splitting of a main line into two smaller branches.
Can you use a sanitary tee for toilet?
You can ‘t use a tee, and you must have a vent between the connection and the toilet. Otherwise when another toilet is flushed, and you are sitting on the toilet, the “whoosh” may go the other way and give you a wet surprise.
Can you put a 90 in a sewer line?
You should design your wastewater pipes in a similar manner, for the most part. It’s a bad plumbing practice to have a hard 90 -degree bend in a horizontal drain line that’s buried in a slab or otherwise hidden. All drain lines should have a minimum fall of an eighth of an inch per foot of horizontal run.
Can a sanitary tee be used horizontally for venting?
Sanitary tees may only be used on drainage piping when transitioning from horizontal (1/4” per foot) to vertical. All others must sweep in direction of flow with proper drainage fittings.
Does a vent stack have to go straight up?
Vent pipes must be installed so they stay dry. This means that they should emerge from the top of the drainpipe, either straight vertically or at no less than a 45-degree angle from horizontal, so that water cannot back up into them.
