[stevekem]

I'm replacing the plumbing for my kitchen and washing machine hookup. Does the layout I put together look ok per code?

Is there a minimum and/or maximum height of laundry standpipe?

Minimum and/or maximum height for standpipe trap from floor?

Many thanks in advance!

 

[Ghostmaker]

The washer machine needs to drain to a sanitary tee fitting not a wye 45 as you show.

Your local plumbing authority may not allow the use of an AAV for the vent.

You will also need to run 3 inch up to the washer pickup use a 3 by 2 inch sanitary tee at that connection.

If both are on the same floor it is code legal. If not you will need to add a vent on the line to the washer trap.

Standpipe minimum is 18 inch vertical drop and 42 inch maximum drop.

 

[ponch37300]

The washer machine needs to drain to a sanitary tee fitting not a wye 45 as you show.

Just curious how come you can't use a wye? Are wyes not allowed vertical like that? I know sanitary tees can't lay horizontal on their back but didn't know wyes couldn't go vertically. Just trying to learn.

 

[srloren]

You need a Combination Wye and 1/8th bend on its back between the trap and the horizontal 45 to vent the washing machine stand pipe. Your local code may not require it but the Uniform Plumbing Code does. Check with the local authority.

 

[TheEplumber]

Just curious how come you can't use a wye? Are wyes not allowed vertical like that? I know sanitary tees can't lay horizontal on their back but didn't know wyes couldn't go vertically. Just trying to learn.

Wyes are allowed in the vertical to connect horizontal branches to the stack, but not in the case of joining a trap arm such as yours.
A wye will not allow air to the trap due to the 45* angle of the fitting- A santee will.

You need a Combination Wye and 1/8th bend on its back between the trap and the horizontal 45 to vent the washing machine stand pipe. Your local code may not require it but the Uniform Plumbing Code does. Check with the local authority.

Not necessarily. A santee will work instead of the combo shown in the image- but the sizing needs to be correct

 

[ponch37300]

Wyes are allowed in the vertical to connect horizontal branches to the stack, but not in the case of joining a trap arm such as yours.
A wye will not allow air to the trap due to the 45* angle of the fitting- A santee will.

Not necessarily. A santee will work instead of the combo shown in the image- but the sizing needs to be correct

So no wye because of the vent, makes sense now. If it was vented before joining the stack then a wye would be fine?

What is the difference between a wye and a combination wye and 1/8th bend? Are they the same but just using a 45 on it? What about a long sweep wye, where do you use those?

Sorry for derailing the OP's post but thought it was a good place to ask.

 

[Ghostmaker]

Ponch take a look at the drawing. Lets say the KS is not attached. And it was just a vent to air. Look at the trap weir. Now look at where the air in the stack is. Notice it is below the trap weir. That is why it is illegal.

 

[TheEplumber]

What is the difference between a wye and a combination wye and 1/8th bend? Are they the same but just using a 45 on it? What about a long sweep wye, where do you use those?

When you add a 45 to a Wye it then becomes a Wye and 1/8 bend- an 1/8 bend is another name for 45.
45 degrees is 1/8 of a circle
A long sweep Wye is just a Wye and 45 molded as 1 fitting. They are called combys or long turn t-y. It's all regional terminology....

 

[stevekem]

Thanks guys! How does this look?

 

[Ghostmaker]

Make sure your local area approves the use of AAV's . Ohio has severly limited the use once they looked into the engineering documents.

 

[srloren]

Wyes are allowed in the vertical to connect horizontal branches to the stack, but not in the case of joining a trap arm such as yours.
A wye will not allow air to the trap due to the 45* angle of the fitting- A santee will.

Not necessarily. A santee will work instead of the combo shown in the image- but the sizing needs to be correct

EPlumber is correct and a SanTee should be cheaper than a Combination. The Combi would allow easier snaking through the vent and would direct the snake away from the trap arm. The plumber doing the snaking needs to determine if he should go into the shower drain or through the vent dependeing on how long it takes for the stoppage to fill up to the shower opening.

 

[stevekem]

I had to change the layout from my initial plan as I had a 13" solid concrete wall to go through to access the laundry standpipe location so I am planning on using an existing drain already in place in this location that was cut off by previous owner.

Below pic is my dry fitted layout. Does this look ok before I glue it?

 

[Ghostmaker]

Are you sure that old drain is any good? And is it connected to the sewer not the storm?

 

[Yodaman]

Are you sure that old drain is any good? And is it connected to the sewer not the storm?

Or a old septic line. Around here our old houses were originally set up with septic systems. When municipal sewage was installed and tied in, the old septic lines were sometimes capped and abandoned.

 

[stevekem]

I should have clarified... The pipe was previously used for a laundry tub but was cut off when the tub was removed. It drains into main lateral line.

I finished gluing that up today and started working on the main drain for the kitchen sink (that this laundry standpipe was initially supposed to connect to).

There will be a sanitary tee (in kitchen sink base) that goes into the 45 fitting shown in pic, with AAV on top of that tee.

I changed it a little based on fittings I have and I added a clean-out, does everything look in pic below (dry fitted)?

 

[stevekem]

I finished it today, I hope everything in layout is ok :vs_worry: Any issues standout to anyone?