Noisy sump. Please help

[dirtyxducks19]

After our recent move I decided to hard pump the pipes for my overflow. Now my drain discharge into the sump is producing big air bubbles that make a ton of noisy. I have reduced the flow as much as I can to try and stop any siphons for happening.
Here is a picture of my pumping. The inside of the over flow box stayed the same as before this issue.
thanks in advance

 

[DIFish]

What kind of drain setup do you have? Usually you want one siphon handling 90% of the flow and another drain handling the smaller variable. Siphon should be near silent when plumbed correctly and the low flow through the other pipe should be quiet as well. Also how long have you had the new plumbing on for? Mine is always loud for about 24 hours after I turn off the pumps.

 

[Gudhjem]

A little hard to tell without seeing the inside of the overflow box, but looks like you have two siphon drains (since both drains I see have valves on them). That's unusual, so I'll assume the one on the right is actually the overflow pipe (it need not have a valve, but since it does, that valve should always be left fully open). The other pipe, the one on the left, needs to be adjusted to create a siphon. Close the valve until the overflow box has enough water in it to cover the drain, but not drain into the overflow pipe (again, assuming overflow is the one on the right). Okay if water drains into it a little, but too much will make noise.

This only works if the inlet for the pipe on the right is substantially higher than the one on the left (it needs a standpipe extending up from the floor of the overflow box). Also, adjustment is possible with a ball valve as you have, but much easier with a needle valve.

 

[dirtyxducks19]

Pipe on the left is the drain. Water coming into sump. The pipe on the right is the return pump

 

[Weasel1960]

Show a picture of your overflow box. Looks to me like the pipe on right is the return pipe not overflow. Not sure how you reduced flow because both valves in photo are wide open. Gate valves give more control for adjustments.

 

[Crustaceon]

I'll just come out and say it'll never be quiet with a single 1" drain. This is not a 1000g tank and you need something like a 1/2" drain that runs full siphon and is dialed in with a ball/gate valve and one more 3/4" drain that isn't under constant siphon and also has a ball/gate valve to pick up whatever slack the primary siphon drain can't handle. The goal here is to have that primary drain take up as much drain flow as possible because siphoning water is extremely quiet and then have the secondary drain only having to handle a few gallons per hour of flow, which would also be very quiet.

 

[dirtyxducks19]

So should I be adjusting the valve for my return pump or the valve for the water overflow

 

[dirtyxducks19]

I'll just come out and say it'll never be quiet with a single 1" drain. This is not a 1000g tank and you need something like a 1/2" drain that runs full siphon and is dialed in with a ball/gate valve and one more 3/4" drain that isn't under constant siphon and also has a ball/gate valve to pick up whatever slack the primary siphon drain can't handle. The goal here is to have that primary drain take up as much drain flow as possible because siphoning water is extremely quiet and then have the secondary drain only having to handle a few gallons per hour of flow, which would also be very quiet.

So I need to replace the drain line with a smaller pipe?

 

[Crustaceon]

So I need to replace the drain line with a smaller pipe?

That'll help with noise if you can get the flow to balance out... which is really hard to do with a single drain. This is why you want a secondary drain. Trust me on this. You basically set the primary siphon line (#1) so it barely can't keep up with tank return flow and then have the secondary non-siphon line (#2) take up that tiny amount of remaining flow. Looking at your overflow box setup, you want to separate the top (#1) and middle pipes (#2) (the bottom one looks like it connects to your return pump?). Have the top one be a 1/2" full siphon and don't add any tubing on top of the bulkhead. This will ensure it'll always be covered by a few inches of water in the overflow box, which will help prevent the siphon from pulling air and will allow it to easily clear out any trapped air bubbles and allow the siphon to restart if your return pump shuts off and restarts for whatever reason. For the secondary drain, use 3/4 tubing and make a "durso" top for it. This will set the maximum water height in the overflow box and will provide a margin of safety.

 

[hoffmeyerz]

You can try running some 1/4" airline tubing down the drain line. Push it all the way down then start slowly brining it back up until the noise quiets down. This finds the trapped air and gives it a way to escape.
I'm running a single drain overflow box doing this and it's silent. It has a 1" outlet that I reduced to 3/4" as well. Takes some patience to find the sweet spot but it's a pretty easy place to start.

 

[Crustaceon]

You can try running some 1/4" airline tubing down the drain line. Push it all the way down then start slowly brining it back up until the noise quiets down. This finds the trapped air and gives it a way to escape.
I'm running a single drain overflow box doing this and it's silent. It has a 1" outlet that I reduced to 3/4" as well. Takes some patience to find the sweet spot but it's a pretty easy place to start.

Good call for a potentially cheap fix before trying anything else. I've heard of this done with rodi tubing as well.

 

[hoffmeyerz]

It works well if you cut the end of the tubing that goes down the drain on an angle to maximize the open area to catch more air. I had to readjust it a few time over a week or two but I haven't had to touch it now for four or five months or so.