piping change

[btuck]

Ok I have a 24" cube with an overflow that is only in the top corner with the bulkhead through the back of the tank. It has a 1" bulkhead and one Inch piping. The way the piping is currently I am getting the occasional whooshing sound because the water level rises and falls. (like on a carlson surge device. The overflow has a durso standpipe so i thought this was suppose to eliminate the problem. I was hoping that maybe the return piping was to blame. Please take a look at the proposed new pipe route and let me know if you think this will help eleviate the problem. My main reason for thinking this will help is because the water is falling faster straight down instead of slower due to the angle of the pipe thus keeping it from backing up.

thanks for your help.

 

[Haole]

Have you tried opening the diameter of the vent hole in the durso standpipe?
Take a look at this link.

 

[Reefdaddy1]

Venting the top of durso may help some. also running a reduction on the down pipe may help as well. Meaning going from 1" down to 3/4". the back up will prevent flushing as well.

 

[btuck]

I might try putting a ball valve on the piping to slow it down. Thanks for the help.

 

[dnjan]

I would never put a restriction on an overflow line.

I believe you are getting the noise because you are trying to put too much flow through your overflow line.

Unless there is positive pressure at the inlet, a partially-filled pipe will carry more flow than a completely full pipe (fluid mechanics related to wetted surface). But when you try to force more flow than the optimally-partially-full pipe can carry, you actually reduce the flow a bit, resulting in higher water level at the drain. This higher water level produces a full-pipe situation with positive pressure at the inlet, which increases the flow rate until the pipe is no longer getting enough water at the inlet to remain completely full.

Then process repeats (with accompanying sounds).

So, unless this problem is due to inadequate venting (mentiond earlier), I would put the valve on the return to reduce the flow a bit.

 

[NaH2O]

Brian - did you already try venting it more? Tagging along....

 

[Reefdaddy1]

I would never put a restriction on an overflow line.

I believe you are getting the noise because you are trying to put too much flow through your overflow line.

Unless there is positive pressure at the inlet, a partially-filled pipe will carry more flow than a completely full pipe (fluid mechanics related to wetted surface). But when you try to force more flow than the optimally-partially-full pipe can carry, you actually reduce the flow a bit, resulting in higher water level at the drain. This higher water level produces a full-pipe situation with positive pressure at the inlet, which increases the flow rate until the pipe is no longer getting enough water at the inlet to remain completely full.

Then process repeats (with accompanying sounds).

So, unless this problem is due to inadequate venting (mentiond earlier), I would put the valve on the return to reduce the flow a bit.

If you view any durso pipe, there is a downsize when entering a bulkhead. restrictions are used constantly in home construction as well to prevent flushing sounds. The back up prevents the whoosh but continually drains. Its quick solve. Also putting a ball Valve can prevent future disasters during power outages.

 

[Scooterman]

If you view any durso pipe, there is a downsize when entering a bulkhead. restrictions are used constantly in home construction as well to prevent flushing sounds. The back up prevents the whoosh but continually drains. Its quick solve. Also putting a ball Valve can prevent future disasters during power outages.

No, actually the reduction back to the BH is actually the right size for draining the rated GPH of the overflow but the durso Up-sizes it prior to do what your saying, never is it a reduction on the amount of rated flow. I just flipped flopped your explanation LOL

 

[btuck]

I have tried opening the vent size. I've even taken the plug all the way off to see if that helps but to no avail.

I believe you are getting the noise because you are trying to put too much flow through your overflow line.

So, unless this problem is due to inadequate venting (mentiond earlier), I would put the valve on the return to reduce the flow a bit.

I don't believe that I am trying to put to much flow through the overflow. It is a one inch bulkhead and I only have a mag 3 running this tank. (seahorse tank). The calculations on that other reefing site said I would only need a
.74" diameter hole to for 300 gph. That's also being conservative as it is pumping up a 4' head.

I am no expert by any stretch so I appreciate any help.