The town requires an air pressure test to hold at 6 PSI for a few hours, maybe about 4 hours. I set it to 6 and after about 30 minutes it is down to 4 to 5 psi. I can't find the leak anywhere by listening or by using dish soap. I am seeing there are ultrasonic detectors $50 on Amazon, but I won't have it in time when I visit for this weekend.
The town does also allow you to fill up the drain with water to the highest point. I did buy a gallon of red fluorescent dye (before knowing there is an ultrasonic leak detector). My main concern is that the 4" drain at the bottom would be under about 10 PSI since the highest point is about 20 feet higher than the bottom. For the plug on the 4" I used the thin glue in knock out plug. It bulges out in the center with just 6 PSI of air. I used this because a local plumber said the 4" red screw plugs will always blow out with air. He said they are fine with water though. I used the red plugs for the rest of the 2" openings.
I figure water and dye is the way to go. It may not even leak with water. Any thoughts?
-Will
The town does also allow you to fill up the drain with water to the highest point. I did buy a gallon of red fluorescent dye (before knowing there is an ultrasonic leak detector). My main concern is that the 4" drain at the bottom would be under about 10 PSI since the highest point is about 20 feet higher than the bottom. For the plug on the 4" I used the thin glue in knock out plug. It bulges out in the center with just 6 PSI of air. I used this because a local plumber said the 4" red screw plugs will always blow out with air. He said they are fine with water though. I used the red plugs for the rest of the 2" openings.
I figure water and dye is the way to go. It may not even leak with water. Any thoughts?
-Will