Originally Posted by speedball1
You may run your drain line providing you vent both the utility sink and the washer stand pipe unless you're planing on discharging the washer into the sink. The drain pipe should be no less then two inches. More about the two 90's later
Say what??? Idon't see any vent on either the sink or the washer. If you're using the floor drain vent to vent the washer and sink you have a illegal set up that's using "S" traps on the sink and washer. Both the sink and the washer will have to be vented through the roof or revented back into a dry vent. You may connect the two vents and revent back into the floor drain vent if it's dry from the floor drain up through the roof. You may not wet vent the two back into the drain line.
Yes it's possible but not very good practice to place 90's in a washer drain line. I would rather you placed the fixtures in line with the drain line but if you must use bends make them sweeps and add a cleanout tee on the end of the drain line.
Good luck, Tom