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Old 06/17/2018, 09:29 AM   #9726
lapin
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Quote:
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The reason I want to know is so I can make sure my overflow is deep enough to create enough pressure for the siphon to flow enough. If it's not deep enough, I want to correct it now.

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In my coast to coast with the bean. My siphon pipe, the horizontal part is 1/2 inch below the water level in my overflow. You will get some sucking from the full siphon and can it cause a vortex. This can suck in air making noise if its not deep enough.
My open channel, its taller than the siphon pipe. It has the water level about 1/4 the way up on the horizontal part.

Maybe this will help.

One other note; My C2C box is 12" deep. I could have made the water level deeper in the box by making taller pipes. Which would have made the weir drop less. This would have made it a little quieter. Maybe a redo down the road.


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Old 06/17/2018, 09:40 AM   #9727
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^^ yep... open the gate valve on the full siphon until water only trickles through the open channel.. or if you want to keep water in the overflow at 3/4, then simply raise the inlet of the open channel so that water only trickles.


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Old 06/17/2018, 09:43 AM   #9728
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Just started my tank last night. Using a modular marine overflow box. Full siphon drain is fully operational (Emperor voice) but it sounds like water is rushing through my open channel.

The water is about 3/4 of the height of the pass through bulkheads (tank to overflow box) and the water level is about 1/2 way up the open channel U.

Is it as simple as I have the water level too high?
yep just as lapin has said... open the gate valve on the full siphon until water only trickles through the open channel.. or if you want to keep water in the overflow at 3/4, then simply raise the inlet of the open channel so that water only trickles


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Old 06/17/2018, 09:46 AM   #9729
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Thanks guys. Thatís fixed that noise.

Anyone got any tips to reduce the noise as the water passes through the bulkhead connecting the tank to the box?


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Old 06/17/2018, 09:58 AM   #9730
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Thanks guys. Thatís fixed that noise.

Anyone got any tips to reduce the noise as the water passes through the bulkhead connecting the tank to the box?


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Only thing that worked for me was to have the bulkheads submerged under water. If you can adjust the gate valve on the siphon and then adjust the open and emergency accordingly, that should fix the noise.


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Old 06/17/2018, 12:31 PM   #9731
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Yea, I find it to be quiet when the water level is about 1/2 way up the bulkheads. In your case u may have to raise the standpipe for the open channel. If u raise the water level u will be back to where u started with the open channel taking to much water. So u will have to raise the standpipe & the water level


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Old 06/17/2018, 12:41 PM   #9732
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A good way to test it out is to raise the standpipe for the open channel to where it isnít taking any water at all. Then slowly raise the water level inside of the box until u canít hear the water passing through the bulkheads. Then u will know where the water level will need to be so u will know where u need to set the height of the open channel. The higher the flow the higher the water level will have to be, but I find it is usually about 1/2 way up the bulkheads.


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Old 06/17/2018, 12:52 PM   #9733
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If I go with a C2C and BA overflow, where are the return(s) normally routed back into tank?

I'm not fancying pipes coming over the top. Mind you given i'm having a trim on top as opposed to rimless, maybe I can route through trim.

Also I'm thinking gyre in the middle rear, so would split return either rear corner be suitable?

Think I should move to a separate Noobie Tank setup thread, as I'm starting to stray from the subject in hand and have so many questions still.

If u go a full c2c u will have to go over the top with the returns. U can route them through the overflow box but then u would have to make the overflow box bigger to be able to do so. I always stop my over box 4Ē or so from both ends of the tank & drill my returns in that area. To me it also looks better if u can view the tank from the end panel. So u would need a 4 sided box instead of a L shape box. For example, if the tank is 48Ē long make the overflow box 40Ē long & leave 4Ē on both ends for the returns.


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Old 06/17/2018, 06:32 PM   #9734
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If I raise the height of the siphon drain inside the box. Will that help me raise the water level height?


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Old 06/17/2018, 06:39 PM   #9735
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If I raise the height of the siphon drain inside the box. Will that help me raise the water level height?


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The valve on the siphon i is what determines the height of water in the overflow


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Old 06/17/2018, 06:55 PM   #9736
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The valve on the siphon i is what determines the height of water in the overflow


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No. The height of the open channel does

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Old 06/17/2018, 07:00 PM   #9737
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If I raise the height of the siphon drain inside the box. Will that help me raise the water level height?


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No, like he said the valve is what will actually set the water level. The open channel & your pass through holes is what will determine where u want to set the water level. Now that u have a idea of where the water level needs to be relative to the open channel for it to be quiet it should be pretty easy. Now all u need to do is determine how high the water level needs to be on the pass thru bulkheads for that to be quiet. Then set the height of the open channel at that height. Personally, I would set height of the open channel to where the water level will be at about the 1/2 way point on the bulkheads & u should be fine. So being u have determined where the water level needs to be on the open channel for it to be quiet, set that point of the open channel standpipe about 1/2 way on the pass thru bulkheads.


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Old 06/17/2018, 09:32 PM   #9738
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No, like he said the valve is what will actually set the water level. The open channel & your pass through holes is what will determine where u want to set the water level. Now that u have a idea of where the water level needs to be relative to the open channel for it to be quiet it should be pretty easy. Now all u need to do is determine how high the water level needs to be on the pass thru bulkheads for that to be quiet. Then set the height of the open channel at that height. Personally, I would set height of the open channel to where the water level will be at about the 1/2 way point on the bulkheads & u should be fine. So being u have determined where the water level needs to be on the open channel for it to be quiet, set that point of the open channel standpipe about 1/2 way on the pass thru bulkheads.


It seems that I have to have the water level quite high in order to limit the noise from the pass through bulkhead. Itís around 3/4 of the diameter of the pass through bh. (See pics) is this okay?



The issue is that the open channel sits so high that I will need to remove the air line for it to fit.

Iíve since removed this JG fitting from the top and left it as an open hole, will it be okay left like this?


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Old 06/17/2018, 09:45 PM   #9739
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Yes, that's perfectly fine,

Mine sits under the water and is 100% quiet.






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Old 06/17/2018, 10:33 PM   #9740
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As long as the water inside of the box doesn’t build up enough to cover the hole on startup it shouldn’t be a problem. If the hole gets submerged on startup it will empty the box before there’s enough pressure to purge the air from the syphon. If that happens u can install the j guest fitting back into the 90 & that will by u a little more room on startup.

I would rather not use the fitting in your scenario, so if the hole doesn’t get submerged on startup I would leave it how it is without the fitting. The airline itself isn’t a must on a exterior box like u have. They are a must with a interior box like bean used when he designed the setup


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