Utility Sink fills up when washing machine drains

[Hannah]

This sink was installed, every time I run the washing mashing the sink backs up. How can I fix this problem? It’s 60 inches from the sink drain to the main drain.

 

[Reach4]

This sink was installed, every time I run the washing mashing the sink backs up. How can I fix this problem? It’s 60 inches from the sink drain to the main drain.

Is it just suds, or water? If on the ragged edge, extending the 3-inch stuff higher might be enough. If it is not even close, then that would say the drain cannot keep up.

New codes call for 2 inch traps and beyond. I think you have 1-1/2 inch, which used to be the norm.

You could have a partial blockage below the basement floor, and getting that cleaned could solve this. If you could make straight down access, I would consider sticking a Brasscraft medium drain bladder down below the sanitary tee, and running water. I used that successfully for a kitchen drain a couple times. The blockage often occurs where the pipe turns from vertical to horizontal below the floor. In the old days, they did not always use long-sweep 90s.

To give that straight down access, you would want to remove more of that galvanized pipe and add another coupling to let you remove a section for access.

 

[Sponsor]

 

[Jeff H Young]

looks like 2 inch to me as I see a bushing on the 2 inch santee.
In any case you've got a slow drain clean it by your choice a snake , jet, water bladder. I don't like the bladder but I've used them