gurgling overflow HELP

[Briguy350]

ok so my tank is drilled in the upper left hand corner with a 3x7 overflow box installed. ive searched and cannot find a fix for the gurgling im getting from my standpipe. this is not a HOB overflow and not RR. coming off the bulkhead i have a T . coming off the T is a stand pipe capped off with a hole drilled in it. the other side is 1" PVC going down to the sump. theres 2 45's and the tip is barely touching the water in the sump at a 45 degree angle. ive been trying to get rid of this for 2 weeks and its driving me crazy. i put tape over the hole and messed around more or less air, to little the box gurgles, to much the stand pipe gurgles. tonight i stuck a little filter pad in there to try and muffle the sound and doesnt really help. ive messed with return and have mag7 on ball valve thats maybe %50 closed right now. still gurgles. HELP

 

[Loki]

Let's see... Where is the sound coming from when everything is wide open with the hole drilled into the cap? From the overflow box? Do you have a video of this? How many drain lines do you have total?

Is there any noise in your sump? Something like a jacuzzi?

 

[Loki]

Is there enough room to put a 90* facing downward into the tank side of the bulkhead?

 

[Briguy350]

1 drain line. no noise from sump. if i take the cap off it gurgles really bad out of the standpipe. if i put the cap on and plug the hole with my finger it starts gurgling out of the overflow box. no video sorry. i did try putting an upside down 90 in and i did nothing. with the cap on it sounds like its wide open just a little less noise.

 

[Loki]

Try putting the 90* back and drilling a larger hole into the cap. If you have done this already then I am out of ideas.

Maybe someone can step in and help.

In my system I have three drains. One that is completely submerged and sits about 6" under the water. I have a gate valve and have it dialed to handle about 95% of the water going into my sump. So no air goes into this pipe when running. The second pipe is at the surface and handles the rest ~5%. This water sticks to the side of the PVC and Has has a "core" of air so it doesn't make noise either. The third is just a backup.

The goal is to have the correct amount of air and water mixing to gather to creat the quietest flow possible. So my suggestion is to drill a larger hole into the cap. I am not positive this will work, but I don't think it will hurt anything.

 

[Briguy350]

yeah bigger hole just makes it louder in standpipe. my drain is at alittle bit of angle going out of the T then about a foot it hit the first 45 and 6" later it hits the other 45 and drains out. im scratching my head cause i dont know what to do. its a used tank and i dont know how long ago the overflow was put in.

 

[Loki]

Hopefully someone else will jump in with some help. It seems like you have tried everything that I would try also.

 

[NanoNathan]

I had this problem to, I Completely tore down my first attempt at pLumbing the overflow. I re plumbed it and this is how it looks now. Also in the top hole I stuck it down till it sounded best.

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[Briguy350]

How LNG of air tube is that? So just stick it in there a ways?

 

[NanoNathan]

I adjusted the air tube up or down until it flowed the best

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[Briguy350]

So I tried the air tube thing and that helped a little but didn't solve the problem. So I started messing around with the drain pipe a put it at a slight angle and I think that gave the air a way to flow up the pipe without gurgling. So hopefully problem solved. Thanks