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Tigahboy

Overflow Diagrams

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Opcn

well, the vortext forms because of the siphon effect from the column of water in the pipe, then when the level gets low enought it makes a toilet like noise because the column of water falling pulls in air along with the water.

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neanderthalman

That's correct.

 

The hole in the top of the durso somehow reduces the flow rate. The reduced flow rate means that less or no air is sucked into the intake - no noise.

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Blind Tree Frog

So back to the advantage of the stockholm over the durso

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Opcn

Takes up less space, harder to clog?

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Tigahboy
Takes up less space, harder to clog?

That pretty much sums it up. =)

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lgreen

Holy Crap! Great Thread Tigah!

 

I really like that you explained some of the noise issues. It would be awesome if you extended your discussion into how to make it quiet at the other end from your experience.

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doody

How the heck do I subscribe to this thread with out posting on it?

Edited by doody

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GruntSculpin

With a full-height internal overflow box and a standpipe, does the stagnent water at the bottom of the box ever pose an issue?

 

Chris

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neanderthalman

I don't think the water at the bottom becomes stagnant due to the flow created by the water tumbling over the wall of the box.

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GruntSculpin
I don't think the water at the bottom becomes stagnant due to the flow created by the water tumbling over the wall of the box.

 

I ended up making a Stockman for my 33 as I only had 3x5" to play with. I thought I was being really clever at the hardware store, but its exactly like in Tigah's diagram. I made another clever decision by not gluing the standpipe in during testing, but that was a disaster, as the entire overflow box emptied into the sump once power was cut. BUt hey, that's what testing in the garage is for. Pipe is glued in and I'm rearing to go.

 

Chris

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Tigahboy

you mean gluing the standpipe to the bulkhead? weird, I've never glued any of the parts for a inside tank stockman or durso standpipe. no problems.

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tootsiedaisy

tigah you rock, Now please help me , I have a 1" bulkhead I built a small overflow box that attaches to the bulkhead,Then it an exact copy of your external Durso design below the T there is 1" PVC straight down then 45's to side of sump and then 45's again to go back straight down to sump,In my sump I have a 4'' pvc pipe glued to the bottom of sump were pipe dumps, My problem is its sipioning and splashing in my 4'' pipe, I stuck some old tubing down the top of durso cap but the pipe will shake and the splash any suggestions. Thanks

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Tigahboy

try making the hole in the endcap (top of the external durso) a little larger (no need for the tubing). that might help reduce the siphoning/rush of water.

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GruntSculpin
you mean gluing the standpipe to the bulkhead? weird, I've never glued any of the parts for a inside tank stockman or durso standpipe. no problems.

 

Exactly. The bulkhead fit very loosely, more than any of the other PVC joints, and just wouldn't seal. I had hoped to not make it permenant so I could try different standpipe options if I ever needed to.

 

Chris

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Tigahboy

maybe the bulkhead was defective. I've never had to glue any of the standpipes to the bulkhead.

 

maybe you could've glued a coupling to the bulkhead and then leave the standpipe end of the coupling unglued so u could switch out standpipes.

Edited by Tigahboy

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ZooGirl

Tigah, is your 15s noisy? On that tank you have an external durso correct? I was thinking of doing that on my 20L but it will be in my bedroom and I want to be able to sleep at night.

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Tigahboy

I think no matter what, there will be some noise (i.e. sound of flowing water).

 

My 15g is in my bedroom as well. like 2-3 feet away from my bed. but I'm a deep sleeper so I guess it doesn't bother me as much. If you are a light sleeper, maybe it might not be the best for a bedroom set-up.

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Sebea

Dennis,

For an external overflow, is the best way to reduce noise to put a stockman in the external box?

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Tigahboy

Yeah, I think stockman's are the best bet. But others say durso's are just as quiet.

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Sebea

Great, thanks.

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steelhealr

Tigahboy...added your thread to the DIY library. SH

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Sebea

I have one more question, for a pico with an external overflow, would 4" height be enough for a stockman?

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Tigahboy

I think 4" should be fine. but it depends what size stockman u plan on utilizing. and u might have to use a dremel/saw and cut the coupling a little to shorten it...but that won't really affect it's efficiency.

 

is this an external overflow box like reefnale's or is this a HOB type overflow?

Edited by Tigahboy

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Sebea

It will be an external like reefnale's, but for an 11" cube. I think the overflow box dimensions will be 4" long, by 4" tall, by 3" wide. I only expect at maximum, 300 GPH for the return pump.

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Tigahboy

eh. you'll be fine then.

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