Prime floor drain trap from standpipe?

I'm adding a laundry room upstairs, and thought it would be a good idea to add a floor drain. I bought a trap seal primer, but I understand they can be a pain to get working and maintain. I'm considering priming the trap from the washer standpipe, but not sure if this would satisfy code in my area (UPC). What do you all think?

I'm thinking not, the washer is supposed to have a standpipe high enogh for suds control.
If too much water went down the pipe to the floor drain, you may wind up with suds on the floor.

If you had a 1/2" tube and not a 1-1/2" pipe, it might fly.

They do make 2" couplings with a 1/2" copper compression fitting for a connection to copper.

Love the drawing though.

Thank Terry,
I didn't think about the suds and totally makes sense. I think these are the fittings you are talking about.
Another idea I had is to use the shower drain that is about 4 feet away to prime the floor drain. Should be a lot less suds anyway.

If you have a laundry tray near by you can prime it off the drain tailpiece with a 1/2 in line.

You CANNOT connect another drain to the floor drain to keep the trap sealed. Doing so creates an "alternate" drain path in case the washer, or shower drain gets clogged. When that happened the water would flow through the "bypass" into the floor drain and down the pipe, and you would NEVER know it until the floor drain ALSO got plugged, and at that time your room would be flooded. (It is the same reason vents cannot be interconnected until they rise 6" above the overflow level of the fixture, OR 42" above the floor whichever is HIGHER.) Those fittings are fed by a "fresh water" source, from any of several possible means.

Thanks HJ,
I'm going to try to this trap seal primer widget to see if I can get it to work. According to the supplier it should be "easy to install"!

http://www.pppinc.net/index.php?act...%E0%D5%C6%DA%E2%9D%DF%DC%CE%D4&did=1158699346