CPR overflow question

[MrMikeB]

Hola amigos!

I have just put to use my first CPR hang on the back overflow. All other overflows to this data have always been in tank with Durso standpipe like configurations. Well, I got it working, however it produces a terrible flushing/gargling noise as it operates. The hole in the back where the water flows down the tube to sump is fitted with a typical plastic bulkhead slotted nipple to keep the large sediment from going down. Any ideas on how to kill that noice?

My best guess is that as the water is flushing down the tube to the sump below there are times when it fills and creates that 'water down the drain' noise. Very disturbing to hear constant flushing sounds from upstairs.

Thanks!

 

[miracles38]

You should have gotten a rigid airline piece with an o-ring that fits down into the hole on the top of the strainer. You can then adjust the airline up and down until the flushing noise is gone.

 

[shiveley]

Let me know how that thing works out for you MrMike, I was thinking about picking one up myself. I'm not a big fan of the old school u-tube siphons, so short of drilling I'm trying to see what my options are.

thanks.

 

[MrMikeB]

<a href=showthread.php?s=&postid=9826045#post9826045 target=_blank>Originally posted</a> by miracles38
You should have gotten a rigid airline piece with an o-ring that fits down into the hole on the top of the strainer. You can then adjust the airline up and down until the flushing noise is gone.

Ahh... that explains it. There was no piece like this. It was used, pulled from a worksing system and I did not think to look for one. Anybody know where to find these parts?

 

[Bdimas]

When i was using one of those i used to put a pvc t in the hole and it helped alot.

 

[MrMikeB]

Is the idea to cork it with one of those Ts so that the water comes in from the side?

 

[jlfnjlf]

Mike,

http://www.dursostandpipes.com/

This should give you a good education on how and why you have such noise. It will also help with a soultion.

John

 

[Bdimas]

Yes. It worked very well.

 

[Duke76]

I've been using a CPR overflow for a couple of years. I found the following in their user instructions:

"At certain flow rates, there will be a "flushing" noise coming from the overflow. This noise is caused by air trying to escape back up through the bulkhead while the water is going down. The enclosed vent tube will help reduce the level of noise. Place the tube through the small hole in the pre-filter screen and adjust it up or down until you find the point where the noise is reduced the most. Slide the small "O" ring down until it reaches the pre-filter screen, securing the position of the vent tube."

I get a flushing noise when the tubing from the bulkhead to the sump gets moved so that one part is higher than the following length. (Think of an "S-shape" on its side.) Water collects until there is enough pressure from water above it to flush the line.

Also, CPR recommends an Aqualifter pump attached to the top to remove any trapped air from breaking the siphon. It also helps restart the siphon after a power outage. Make sure you keep it clean !

Hope this helps.

 

[tanku]

try www.amekaaquatics.com for parts to the overflow

 

[matttaylor]

Also, if the end of the hose is underwater in your sump you'll get that noise. Try and keep the end of the hose above the water level but not so high that you get a splashing sound.

 

[MrMikeB]

I have got it out of the water on ths sump side... I am thinking I am missing that O ring. If I cannot find one, I will try to T and see what I can get to work.

 

[JeffReef]

Mike,

My CPR overflow is very quiet. What I did was to install a ball valve below it to try to slow the flow a little. When the water drains too fast it becomes noisy because air is allowed in. I always have about an inch of water inside the overflow.

I also use the Aqualifter pump to keep the siphon.

If you decide do do this, just make very small adjustments on the ball valve. If you go too much too soon, the overflow box will literally overflow.

 

[MrMikeB]

So with the ball valve you are able to keep the overflox box with enough water to submerge the intake port?

How finicky are the adjustments? Will the water level fluctuate over time and eventually overflow out of the box?

 

[Duke76]

The only purpose of the O ring is to stop the rigid airline from sliding further down the hole in the pre-filter screen. Anything that would accomplish that would work, e.g. a rubber band wrapped around the airline.

 

[MrMikeB]

So I drilled the top of the bulkhead filter screen that covered the intake and stuck enough 3/8" airline in it (snug fit) and fed it all the way through until it stopped making noises. So much quieter...not perfect, but definitely not the toilet flushing sound.

Thank you all!!!!

 

[JeffReef]

<a href=showthread.php?s=&postid=9830403#post9830403 target=_blank>Originally posted</a> by MrMikeB
So with the ball valve you are able to keep the overflox box with enough water to submerge the intake port?

How finicky are the adjustments? Will the water level fluctuate over time and eventually overflow out of the box?

Mike,

Glad you got your overflow noise figured out.

The ball valve that I installed was very easy to adjust. I've never touched it after the first day. Water level would drop a tiny bit when my sump is getting low. But after I top the sump off, everything is back to normal.

I've never had flooding issues and I've left this system running while on vacation for three times in six months.

Jeff