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Adding Standpipe to Existing Utility Tub line

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RW22281

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Hello, I have an existing utility tub and previously drained my washing machine direct into the utility tub. I would like to add in a washing machine standpipe in addition to the utility tub, but I am unsure about how to design. I thought about either of the designs within the attached (A and B), but I am concerned these designs will lead to sucking the trap dry. I believe tapping into the trap and running a separate line is probably the "best" design, but is there a design solution where I can maintain a single arm and avoid having to bust out the wall?
 

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RW22281

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This is what i ended up going with...no floods yet! *knock on wood* Note: i just shoved a pipe in there for a better picture, but the one sticking straiggt out elbows up 90 degress and the tailpipe connects to utility sink drain in final version.20200819_185301.jpg
 

Mitchell-DIY-Guy

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I'm sure others will weigh in here, but I think that the air vent needs to be higher...?? Higher than the sink? We can't see the height of the sink here...

If it works, great. Personally I would have made the standpipe out of 1.5" PVC, not the 1.25" stuff. Sometimes that water can come out of a washing machine at high velocity and volume, and just hope that the 1.25" is sufficient...
 

CT18

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That is all wrong. You connect that to a modern washing machine and something is going to be flooded. Make sure that aav is in there good as it will need to hold water back
 

SHEPLMBR

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And that 1-1/2" tubular stuff is going to blow apart.
 
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