I'd like to convert the plumbing from a small "grease sink" to a stand pipe for my washer. Is this possible? Is the pipe's diameter too small to accommodate the pressure from the discharge of water from the washer? What's the recommended diameter of the pipes for a stand pipe?

I'd like to convert the plumbing from a small "grease sink" to a stand pipe for my washer. Is this possible? Is the pipe's diameter too small to accomodate the pressure from the discharge of water from the washer? What's the recommended diameter of the pipes for a stand pipe?
I can shown you how to pipe for a washers discharge but first I have to know how high the trap is off the floor. In the mean time I answered the same question a few posts ago look down and open up the thread "SLOP SINK" and check out the attachment. The pipes should be 2" in diameter. Regards, Tom

The trap is rather high up - approx. 3 ft.

The trap is rather high up - approx. 3 ft.
Sorry Charlie.
The trap needs to have at least a 2" pipe 36" high for a stand pipe. This would put the stand pipe twice as high as your washers flood rim. IIn case you missed it I made a freehand drawing of what the layout should be. The trap needs to be near the floor. What you can do is open up the wall and cut in a sanitary tee close to the floor line and go from there. Regards Tom

Thanks Tom.

Just a few more silly questions, if you don't mind. (I'm a total novice at this).

The "vent pipe" is considerably larger than 2 inches (approx. 4" diameter) and made of PVC. Am I referring to the right pipe? Would it be okay to use it? Is is the same pipe that drains the water from the upper floors?

Are you suggesting I forget about using the slop sink and focus on the vent pipe?

Wouldn't it be easier to cut the slop sink pipe, move the p trap down, then install the stand pipe?

Thanks Tom.

Just a few more silly questions, if you don't mind. (I'm a total novice at this).

The "vent pipe" is considerably larger than 2 inches (approx. 4" diameter) and made of PVC. Am I referring to the right pipe? Would it be okay to use it? Is is the same pipe that drains the water from the upper floors?

Are you suggesting I forget about using the slop sink and focus on the vent pipe?

Wouldn't it be easier to cut the slop sink pipe, move the p trap down, then install the stand pipe?

What you describe isn't the vent, it's the 4" soil stack. So we're on the same page as a rule any pipe below a trap is the drain and anything above the trap is the vent. I was referring to the slop sink pipe when I said to cut in a sanitary tee next to the floor and go from there,(see attachment). Or what you can do is cut the old tee and trap out and lower it to the floor. The piece you cut out can go back on top of the tee and connect the top of the tee back into the vent pipe. Depending on what material your pipes are you can use No-Hub Bands and couplings. Good luck. Tom

Thanks again Tom.

Your advice was very helpful. You've solved a major problem for me. Much appreciated. :)