Invest in a Plumbing how-to book. Info is invaluable. Plumbing codes may be a problem, they differ with locale.
Normally the waste is no less then 2" and 30" high and is piped into a 2" P trap IF your piping it into a kitchen sink provided the waste is 2" them some codes do allow a direct hook up if the discharge tee is at least 3/4" diameter
You can drain it directly into a drain pipe. Just make sure the the top of the drain pipe is even with the top of the washing machine. If not, the water from the washing machine will drain all of the time. There is no valve in the machine to stop the water from draining. The washing machine drains using a pump motor.
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".
no, in fact most plumbing codes require a 2" drain/trap for washing maching drain.
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.
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.
your drain has a restriction in line and needs to be snaked
See if there is something stuck in the pipes that is clogging it up and causing this to happen.
It is located at the bottom left corner of the machine. Just apply your strength on it by pulling it and there you go, its right in your hands in a jiffy.
A vacuum breaker is usually installed at the top of a vertically-mounted drain pipe leading to a drain. The water drainage hose from an appliance such as a dishwasher or washing machine should never be plumbed directly into a drain stand pipe without a vacuum breaker. The vacuum breaker prevents contaminated water from the drain being sucked back into the appliance if it has a fault.
Partial blockage. Snake the drain.
Washer supply hose, 3/4 x 3/4Water , or you could mean drain line hose. Drain
No! Dumping the washer output into the sump is illegal.