Minimum 1 1/2"
No, stand pipe for washing machine is meant only for washing machine. Tie sink into drain line that washing machine stand pipe is tied into. 2" minimum drain line should be what you tie into. Sink drain line use 1 1/2".
your drain has a restriction in line and needs to be snaked
The washing machine is pumping out water faster than the drain pipe can handle. A trap in the drain pipe to which the washing machine hose is attached is required and that makes the water flow slower than you might expect. Having the washing machine some distance from the main drain line requiring a long horizontal run in the machine's drain pipe will also result in a slower flow. Other causes could be: undersized waste pipe, backward wyes or santees, backgraded piping, backed up gray water system. An obstruction such as a checker piece or poker chip could be lodged within the pipe. Such an obstruction acts as a valve or flap that will pivot out of the way when a snake is pushed through the pipe but pivot closed when water attempts to flow through. Nowadays a two inch drain pipe is recommended. Some cities require two inches or larger. Do not seal around where the washing machine hose is hooked onto the drain pipe as this could overload components within the machine.
There are multiple reasons why your washing machine might not drain. The drain line could be clogged with debris or even clothing, the pump pulley could be frozen, or the pipe that the washer drains into could be clogged.
Either dried out P-trap or possibly no p-trap or break in drain line after p-trap
No, stand pipe for washing machine is meant only for washing machine. Tie sink into drain line that washing machine stand pipe is tied into. 2" minimum drain line should be what you tie into. Sink drain line use 1 1/2".
your drain has a restriction in line and needs to be snaked
It depends on whether or not your drain line is threaded at the top of the pipe. Older homes like mine have a threaded line but newer homes have a smooth line.
drain line is partially clogged.
Depending what size your clothes washing machine pipe is to begin with depends on your answer, however you cannot go smaller than a two inch or 50mm waste pipe for your clothes washing machine.
Washer supply hose, 3/4 x 3/4Water , or you could mean drain line hose. Drain
Most things you can't do yourself but look for plugs in the drain line.
the water calve could be going bad or you could have a siphon happening from the drain line.
Unless you know that there is one in the line before it gets to the main line, you should. Sewer gas can come up that drain just like any other.
Sounds to me like you have a clog in one of your pipes. This causes water from the washing machine to drain into other pipes instead of going down the main line properly. Check the bathtub when the washing machine is draining... they're notorious for filling with old yicky washing machine water! The clog can possibly be in a line ion the house, or possibly be caused by roots in the main line. Sounds like it's time to hire a plumber! Good luck!!
You hang it out on the line after washing in the washing machine
The washing machine is pumping out water faster than the drain pipe can handle. A trap in the drain pipe to which the washing machine hose is attached is required and that makes the water flow slower than you might expect. Having the washing machine some distance from the main drain line requiring a long horizontal run in the machine's drain pipe will also result in a slower flow. Other causes could be: undersized waste pipe, backward wyes or santees, backgraded piping, backed up gray water system. An obstruction such as a checker piece or poker chip could be lodged within the pipe. Such an obstruction acts as a valve or flap that will pivot out of the way when a snake is pushed through the pipe but pivot closed when water attempts to flow through. Nowadays a two inch drain pipe is recommended. Some cities require two inches or larger. Do not seal around where the washing machine hose is hooked onto the drain pipe as this could overload components within the machine.