Problem wuth durso

[insearch]

Currently I have a durso set up in my tank. It is an 1 1/4" at the top reducing thru a 1" bulkhead then back to a 1 1/4" ( Yea I know should of had the tank drilled bigger) thru 90deg bend, thru 1 1/4" ball valve, another 90deg bend and into a filter sock in sump.
The problem I am haveing is the water level keeps bouncing up and down causeing not a sucking noise but just a variable noise from my overflow drop. On the website it says that the reason for this is the down pipe is too long. But no matter what size I put the down pipe it still does it. Now granted the longer the downpipe the longer the stroke, as of right now I have no down pipe on at all, just a 90 off the tee. Please see attachment for layout. It still does it. My wife is all over my A@# right now about the noise. So could someone help me with my domestic utopia?
Thanks
Bob

 

[insearch]

Sorry did not seem to come thru it won,t let me attach from paint program

 

[Anonymous]

What is the line to the sump doing? Is it in the water or above it? What is the size of the hole in the top of the durso?
Flushing is usually do to backpressure in the line.

 

[Anonymous]

Hmmm... I had this problem; trying to remember what caused it...

I know I drilled some 1/4 inch holes in the stand pipe, that may have helped. I also have a hole drilled in the top of the U-tube with a piece of tubing sticking down and that lets air into the water.

 

[insearch]

The line to the sump is or may be submerged in the water in the sock. I will have to check this. Could this be mt problem?
I currently have about 7- 1/16" and 2 -1/8 holes in the top cap.

 

[ChrisRD]

If the drain is discharging straight down into the sump and it's submerged, air is probably getting trapped in the line causing a build-up of pressure and then eventually a flush.

In my case, the solution was to angle the drain pipe into the sump (almost horizontally) to allow the trapped air to escape without building up.

 

[Anonymous]

Could be. Try bringing the line out of the water in the sock, or try putting it an inch or two below the water.

 

[insearch]

Maybe this will help

 

[liquid]

Have you tried varying the hole diameter that allows air into the standpipe? The variable water level is due to a siphon being formed in the standpipe causing it to create a sucking sound.

shane

 

[WannaBeReefer]

I had a very similar problem. Once I put the angles closer together and lower in the line the noise vanished. No holes drilled anywhere other than the top of the durso. Now the down tube stays filled with water to about 2 to 3 inches below the tank.

 

[Anonymous]

The elbows can be trapping air and when the water pressure is enough to clear the air, it flushes.

 

[RJSorensen]

If you can reduce the amount of air going in . . . there will be less in the sump to deal with. Attached is a method I used to help me with both. It is a muffler from a SMC high speed air valve pack. It has variatiable 'draw' via the membrane inside and used to reside upon a air valve. I ended up leaving the valve all the way open so just took it off some months ago. I can see the bounce from time to time . . . but can no longer hear this. My 55 is silent, I can only hear the sound of the fan in the lights.

 

[insearch]

Thanks guys fixed the problem, down pipe in the sump was under water. I cut off down pipe and adjusted air hole one more time and it works like a champ.
Thanks again.