Hi All,
I have a deep basin utility sink in my detached shop. I just moved here and I suspect this drains to a dry well or daylight. When the snow melts, I will know for sure. There is no vent. There is a 2" Pvc drain coming up through the floor, offset about one foot from the center of the drain, which has a 1 1/2" trap on it. THe problem is this was draining very slowly. So I put a tee on the vertical and ran a riser up one foot and placed a trap vent on the top to let some air in. THis did not work, but when I unscrewed the spring loaded trap vent, lo and behold the water rushes out. I thought the trap vent might not draw air in easily enough, so I replaced it with an air admittance valve only to find that it does not work either. So when the top of the tee is open, pipe vented to open air, it does what a good drain pipe is supposed to do, it drains. When I put on trap vent or AAV, I am back where I started. Something I noticed, is that the vent pipe has positive pressure in it when water is draining which would cause the diaphram to close instead of opening. Do I need to shorten the riser? or Do AAVs only work in conjunction with vents to open air. and also I realize that this whole scenario isn't quite kosher. Any help would be greatly appreciated.
I have a deep basin utility sink in my detached shop. I just moved here and I suspect this drains to a dry well or daylight. When the snow melts, I will know for sure. There is no vent. There is a 2" Pvc drain coming up through the floor, offset about one foot from the center of the drain, which has a 1 1/2" trap on it. THe problem is this was draining very slowly. So I put a tee on the vertical and ran a riser up one foot and placed a trap vent on the top to let some air in. THis did not work, but when I unscrewed the spring loaded trap vent, lo and behold the water rushes out. I thought the trap vent might not draw air in easily enough, so I replaced it with an air admittance valve only to find that it does not work either. So when the top of the tee is open, pipe vented to open air, it does what a good drain pipe is supposed to do, it drains. When I put on trap vent or AAV, I am back where I started. Something I noticed, is that the vent pipe has positive pressure in it when water is draining which would cause the diaphram to close instead of opening. Do I need to shorten the riser? or Do AAVs only work in conjunction with vents to open air. and also I realize that this whole scenario isn't quite kosher. Any help would be greatly appreciated.