4 washing machines on 2 floors, double Ts, stacked Ts ?

[tarlax]

I want to drain 2 washing machines one a first floor with a 3" double tee, and 2" reducers on each arm, and wet vented by a 2" pipe going up to the second floor, that will have 2 stacked Ts.

The photo shows the 3" double tee, with 2" ptraps, the 2" wet vent is not shown.

Will that work ?

 

[Reach4]

and wet vented by a 2" pipe going up to the second floor, that will have 2 stacked Ts.

I don't know if any code allows that, but you might want to identify which code you are supposed to meet.

 

[Sponsor]

 

[tarlax]

I don't know if any code allows that, but you might want to identify which code you are supposed to meet.

The canadian plumbing code.

One part that I'm not sure about is the suds constraint: will foam (suds) from the top floor build up and ooze out from the 1st floor ?

Here's the complete diagram

 

[John Gayewski]

You no wet venting between floors.

You need a drain from the second floor that passes by the vent from the first floor.

Washing machines that drop a floor need to be tied in 10 pipe diameters from anything else. I'd have to look up the specifics but you need a new plan.

 

[tarlax]

The Canadian Plumbing Code allows wet venting between floors, with some constraints:

Section 2.5.2.1. says:

h) where a wet vent extends through more than one storey, the total discharge
from any one storey above the first storey does not exceed 4 fixture units

Clothe washers are 2 FU each, so 2 washers is right at the limit.

The limit on what can be drained in a 2" wet vent is also 4 FUs, again, right at the limit.


As for suds, it's unclear if the change of direction at the exit of the double tee could cause suds problems (suds traversing the lower ptraps). The increase of diameter of the 3" double will definitely help.