By placing the waste 2x the diameter above the opening
No. You vent air from a sewer line.
The vent terminal is allowing down drafts to enter thus one would have to install a return bend on this pipe to prevent the air from entering but it will allow sewer fumes to escape
It allows sewer gases to safely escape.
Install an automatic air vent on the line
The highest 4 inch pipe should have a vent on it, or directly above a toilet junction Above the flood level rim of the fixture it is servicing IT does not mean the toilet
put it on ya stink pipe
A vent pipe is located afte a fixture trap to remove dangerous fumes from the system and exhauts them through the roof terminal as the fresh air enters through the fresh air inlet
You must maintain a 2" air gap from indirect waste to sewer waste. If sewage back up was the issue, I would recomend "directly" piping the 2 inch drain to the main sewage with a 2 inch normally closed backwater valve. If you piped an indirect drain you would not be protected from sewer back up. I assume this is for a sink perhaps in a basement?
No, it won't carry the required amount of air. A vent is usually 1.5 inch and an exhaust is 4 or 5 inch.
We need to know more info. such as, is the pipe cooled, air or ground temp. around the pipe. what temp is the water.
Sounds like your washer doesn't have a connection to your "stack pipe". As water moves through a drain pipe, it creates a vacuum behind it, the "stack pipe" or "vent pipe" is usually a pipe that goes through the roof of your house and provides an open air connection to all of your plumbing fixtures so the vacuum is provided a way to suck air rather than sucking the water out of your "P" traps or other fixtures such as your toilet. Chances are your toilet is also "sucking" from your washer, but you just don't notice it. It is also dangerous because if the washer or other fixtures are sucking water out of your "P" traps, then you may be getting methane and other sewer gases into your house. Have a pipe run from washer drain to your vent pipe and this should eliminate the problem. Be sure it connects to the vent pipe because if you ever have a sewer backup, the vent system won't allow the gray water to empty into your house through the air pipe.
Two times the diameter of the supply pipe, but never less than 1 inch.