Sink drain to stack connection

[fotto]

I posted this yesterday in repair forum by mistake (no replies either)...
Edit note: Using "stack" incorrectly I believe...should be main drain line.
Hi,
I'm finishing my basement and will be adding in a single sink for a wet bar. I have no floor drain and will use a direct coupled/ventless sink discharge pump. Plan is to run 1.5" PVC (have enough at home already) from that pump to my main 3" soil drain, and my question pertains to that connection. If you look at the picture, you will see the main drain running along side the beam, dropping a couple feet at the far end, and then turning right and exiting house at the right wall to my septic tank. The tie in coming in on the far right is for a roughed in sludge crock from the other end of the basement that has never been installed/used. The sink line will be coming in from ceiling joist cavity from a room to the left of the beam. I now have the wall shown drywalled and would like to tie in the sink drain line as close to the left as possible, into the horizontal (or vertical) section due to working space behind wall being about a foot deep.

I'm having a hard time interpreting how close I can be to that left corner based on review of plumbing code. Plan is to use a 3 inch wye fitting and reducer to tie in the 1.5" line from sink. This area looks much simpler to tie in the wye (vs. along the beam portion). Actually, there's around 10.5" of vertical drop that I could also use to tie into (before it turns right) which would be even more convenient.

Any advice on where that wye should go in relation to the left corner would be appreciated.

Thanks,
Floyd

"I'm having a hard time interpreting how close I can be to that left corner based on review of plumbing code."

I'm having a hard time deciphering what you are talking about...

---------------------------------

Plumbing codes normally require a vent within 6 feet of a 1 1/2" trap...even for a wet bar.

This means that you cannot use a "ventless sink discharge pump"....There is no such thing.

Even if you terminated your bar sink into a sump pit within 6 feet, the sump pit would still need to be vented.

Based on what you have provided, I cannot see how you can properly or legally (by Code) accomplish what you wish.

Please provide further details and perhaps someone can help.

As submitted, (and unless what I am missing something) what you propose simply just does not work....

[pushkins]

I don't see anywhere that prohibits you tieing into that line on the vertical rise, the only problem there will be if you using a wye you will have to lift the waste up higher to meet the wye. It might be just as easy to put the Y on the horizontal run on that back wall (but I think you said it's drywalled over now).
As for the "ventless pump" you need to ask your local building department if they approve these for use, some don't (venting issues)If they do allow it you have to have a check valve installed to stop the sewar gas.

Again.

Traps are required by all plumbing Codes to be vented.

The distance from a trap to its required vent is determined by the diameter of the trap pipe.

For a 1 1/4" pipe, the maximum distance from the trap to its vent is 5ft.
For a 1 1/2" pipe, the maximum distance from the trap to its vent is 6ft.
For a 2" pipe, the maximum distance from the trap to its vent is 8 ft.

According to the photo supplied by the original poster, there is NO WAY one can drain into an 'unvented discharge pump' or anywhere else on this existing 3" drain line and still be within 8ft maximum of any existing vent.

the ONLY solution here is to drain to a VENTED sump.

Period.

[fotto]

When I originally posted this, I was confused about just what a "stack" was and rules about tying in within a certain distance from the stack. After subsequent research (my original post went unanswered for some time) I determined that I could put a wye either in the vertical section of that main drain line or in the horizontal section (if I can get back there to cut/splice) as I'm no where close to a "stack".

As far as the wet bar drain pump, this is the product I'm referring to from Flotec:
http://www.flotecwater.com/pdf/FP774(6-22-06).pdf

Read the notice on page 2 referring to not requiring a hook up to main stack vent. I have read section 11.7.9 of the 2006 NSPC and it appears to verify what Flotec is describing, that it's (individual fixtures) not subject to venting requirements of Code, and venting only as required for proper operation of the equipment. . I haven't verified this with local code yet but don't see why I need any other venting.

[maubry]

You can make use of this stainless steel bar sink I saw online.

[chpwaman]

Originally Posted by homebild

Again.

Traps are required by all plumbing Codes to be vented.

The distance from a trap to its required vent is determined by the diameter of the trap pipe.

For a 1 1/4" pipe, the maximum distance from the trap to its vent is 5ft.
For a 1 1/2" pipe, the maximum distance from the trap to its vent is 6ft.
For a 2" pipe, the maximum distance from the trap to its vent is 8 ft.

According to the photo supplied by the original poster, there is NO WAY one can drain into an 'unvented discharge pump' or anywhere else on this existing 3" drain line and still be within 8ft maximum of any existing vent.

the ONLY solution here is to drain to a VENTED sump.

Period.

I am also looking to pump my water from a bar sink in my basement, no options for a floor drain. I understand the need for a vent with a trap, but pumps like the one here, do not seem to require a trap, therefore would it stand to reason they do not need to be vented???

[DonAtlGa]

Nifty pump. The check valve on the up pitched discharge line blocks the waste (and so the sewer gas) from returning thru the fixture drain. Same piping as a sewage ejection pump - except no sump, so no traps to be sucked dry. Has some obvious limitatations (I'm guessing flow, near zero abrasive/solid waste handling, pump noise every time the sink runs) but should be fine for a bar sink - just watch the lime peels!

The pump should work fine if it is approved by your local plumbing code office, but if you are under the IRC Plumbing Codes, it would still require a vent connected to the building vent system or may be required to have its own independent vent through the roof.

Check your local code office for details.