Laud overflow thread again...not waterfall

[Bgmrc]

Hello all,
I am having a very tuff time getting the flows to match to stop the gurgling effect. I have a 92 corner setup. Single down single up. 1inch down 3/4 up. I have return pump setup into the loop system and have some issues with the adjustment in smaller amounts of return flow control. Loop Bluetooth at the moment only allows for 10% changes. So i have like 70 80 90 and 100percent to work with. I want as much return flow as possible. The sump/fuge is in my basement directly below display tank. DC loop return pump is rated for 14plus head pressure and my return line in about 10ft so all within spec.
Questions are same as i have researched here somewhat. I have tried the Rodi line down for air behind water theory. Have tried more flow and less flow. Tried the pvc down into the water and inch into filter sock. Tried filter cup. Tried pre filter sponge on the siphon cage, tried no filter. Im out of thoughts.

HELP PLEASE. And thanks for any advice.

 

[Bgmrc]

I do have a ball valve on return line. I will adjust the down line to go under the water level in sump again and adjust the return flow with that valve to see if that help at the tank siphon side. My sump side noise is not an issue as its in my basement. The gurgle at the tank is my issue.

 

[dbowman5]

if i understand you, you have one drain pipe. to create and maintain a siphon you would put a gate valve on the drain pipe. turn the return pump to 100% with the valve on the drain wide open. the drain pipe would be under the level of the sump.
the water should go down the drain faster than the pump can return it to the DT. if it cannot turn the return pump to 90%. if it cannot still lower til it can.
the initial gurgle comes as the water purges the air from the pipe. a siphon flows faster than if the pipe is above the sump level. once the siphon breaks there is a second gurgle as air gets sucked into the pipe.
after the siphon is established, slowly close the gate valve until flow cannot drain the skimmer box to the point that air is pulled into the pipe. further close the valve til the amount overflowing does not create a waterfall noise. this will be silent because the water in the overflow box is just under the level of the weir that is skimming the tank. I found that the bean animal three pipe overflow is safer to prevent spilling in case of drain failure. when i set up a diy over the back siphon i worried about overflowing the DT. I added a pump shutdown float in the DT so if a problem occurred the tank would not overflow. i see a lot of applications where the weir feeds a bottom of the tank drain. This drain has a pipe that extends toward the top of the tank. This pipe prevents the weir from draining during pump off conditions. if I was looking at it i would think that it was necessary to prevent the waterfall. If you adjust the valve properly the drain could have a strainer near the bottom and the water level could be just under the weir. does this help? good luck figuring how to deal with this in your situation.

 

[Bgmrc]

Ill be adjusting things soon...

 

[Bgmrc]

I do follow the idea of passing the initial gurgle then fill up the overflow box to somewhat near the return....

 

[Mike Kearns]

Look into something called a stockman standpipe. I supposedly can make a single drain quieter. I researched it for my single drain overflow box but never actually tried it.

 

[Bgmrc]

Will do ^^&

 

[Water Dog]

I would never put a gate valve on a single drain Durso style overflow. That is a flood waiting to happen. You never want to put any restrictions on a single drain situation. Restricting a primary drain line via gate valve is only for dual or triple drain Herbie or Beananimal set ups IMO.

How deep does your drain line go beneath the water level of your sump? I would make sure that it’s about 1/2“ beneath the sump water level, an inch at most. Any more and the added back pressure will exacerbate the toilet flush effect in your Durso plumbing. Also, how vertical is your drain plumbing to the basement? Any horizontal runs will trap air, again exacerbating the flush.

 

[Bgmrc]

Waterdog....so what you have just said is totally my situation i am thinking. I am using flexable lines for drain and return. I have made a few pvc cut pieces to try to find the correct depth under water in sump. So no more then an inch...ok i will adjust.