Venting Two Washing Machines on Single Drain

[Rag]

Just wanted to check if my drainage and venting seemed ok. This is for two washing machines (standpipe) draining into a 2" drain, and each trap vented to a 1.5" vent stack. (This is for Canada if that makes a difference) I circuit vented the traps.

I haven't seen it anywhere but is this correct venting for two washing machine standpipes on a single drain?

 

[Reach4]

I am not a plumber. Is the already-vented drain from the right-hand standpipe allowed to join the trap arm of the second standpipe before that trap arm hits a vent? I don't know. But I'd bet it works great.

 

[Sponsor]

 

[Rag]

I am not a plumber. Is the already-vented drain from the right-hand standpipe allowed to join the trap arm of the second standpipe before that trap arm hits a vent? I don't know. But I'd bet it works great.

Good notice. But I don't see why not. A washing machine has a value of 1.5 fixture units. So wouldn't it be the same as have a single standpipe with a 3 fixture unit load before it hits the vent vs two 1.5 fixture unit loads?

 

[hj]

I do not see a vent for the left hand trap between the trap and the connection with the other machine.

 

[Rag]

I do not see a vent for the left hand trap between the trap and the connection with the other machine.

Thanks gents it seems like you are in agreement. I will get the vent in before the wye connection!