Washing Machine + Laundry sink P Trap question

[eblend]

Hey guys,

I am new here. I have previously done my own basement plumbing without issues and to code (Calgary, Canada) with permits and all, and now would like to help my parents with their basement development. We are trying to relocate the laundry room to a different part of the house, close to the furnace.

Currently there is a 3" drain right next to the furnace which is capped off simply has a hole drilled through the side with the Furnace water dripping into it. The drain has a P trap under the concrete.

I would like to drain my washing machine and laundry sink into this single 3" drain. Do I need P traps on both the washing machine and the sink, or is the fact that there is already a p-trap under the floor is all that is needed? I read online about the negative effects of double P traps (something about canceling each other out?) and I want to make sure I do all of this according to code.

Attached is a picture of what I am hoping to accomplish. I talked to the helpful gentlemen at Home Depot and he said because I already have a trap under the floor I should be able to drain right into it. He said that if I was draining just the washing machine, I could extend the pipe to be above the top of the washing machine and just connect the hose to it and be done, but since I want to run a laundry tub as well, I need additional piping and not sure if this will work.

In addition, the furnace drain right now seems to be "sealed" around the 3" drain pipe with some putty, but that drain was simply a hole drilled into the side of protruding 3" pipe. Does this connection need to be airtight or is it okay for water to drip in from the top as shown in the diagram?

Thank you for your help

 

[IFIXH20]

That set-up will not pass codes in the States. Also the furnace drain need to be indirect - need to be protected by an air gap - some cities require a neutralizer on condensing furnace drain before draining into the building drain.

 

[eblend]

That set-up will not pass codes in the States. Also the furnace drain need to be indirect - need to be protected by an air gap - some cities require a neutralizer on condensing furnace drain before draining into the building drain.

Thanks for the info. The furnace drain was like that when the house was built and I assume passed inspection at that point. How would I go about making this legal, just add P traps at each location, or is there something else required (venting?) Ignoring the furnace runoff, how would I hookup both sink and laundry to the same 3" drain?

 

[johnjh2o]

Each fixture requires it's own trap and vent. They also can not be connected to drain the way you have it. They need to connected after the trap for the floor drain.