The piping in the photo on the left represents a laundry sink drain while the photo on the right depicts a washing machine s stand pipe.
Drain pipe size for washing machine.
A 2 inch drain pipe is required for all washing machines.
The standard for new washing machine drain sizes according to the universal plumbing code is now 2 inches.
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The inside diameter of the drain pipe should be a minimum of 1.
Although the pipe sizes are generally standard each jurisdiction s building and plumbing codes could have specific requirements for the size of the pipes and how.
In your scenario if a fixture that s farther upstream discharges lots of water that rushes by the wye fitting where your washing machine drain pipe connects the vacuum created by the water rushing past the washing machine branch wye will siphon water from your trap.
The machine pumps the water through the discharge hose and into the drain pipe.
The pipe should be between 18 and 30 inches high from the floor while the p trap should be between 6 and 18 inches from the floor.
What causes washing machine drain to overflow.
Drain pipe not the proper size.
A washing machine is connected to a drain hose and to hoses that connect to the hot and cold water supply.
The former requirement of 1 1 2 inch pipe is not enough to handle the fast drainage of modern washers.
Several circumstances can cause your washing machine drain pipe to overflow.
The most likely problem is a clogged drain pipe.
Kevin the answer is no.
What causes an overflow.
You only have to remember this the sanitary tee that serves each fixture is the place where the trap arm drain and vent come together.
That is a vertical length of pipe that connects to a p trap that in turn connects to the drain.
The drain hose is connected to a stand pipe attached to the water drainpipe.
Aside from having a clogged standpipe there are a few other reasons why your washing machine drain might overflow and some of the other most common reasons are.