stockman standpipe help.

[Joel A]

Ok, so i've got a HOB overflow, with a stockman standpipe in it...

The issue is the gurgling noise and a flushing effect that comes from the pipe.

The water level in the overflow rises and falls with the rush in of air, and gurgles very loudly.

I originally only had one air hole drilled in the cap on the standpipe, but from recommendations of others, i was told that more air hole would eliminate this issue.

I drilled more small holes in the cap, one at a time and retried it. First new hole seemed to help, but still needed more, 2nd new hole seemed to really help, and almost eliminate the problem, but it would still catch a bit of air every 30 seconds or so, causing the noise and air bubbles into the bottom tank.

So i figured drill one more, and i should be good, right? WRONG... i drilled another small hole and it has made the problem worse than it was before. Constant noise and up and down flushing going on in the overflow...

What's going on, how do i fix this?

I would have left it as is, because the noise wasn't too bad, and i could deal with it... but now i plumbed my tank drain line into my skimmer (to feed a recirculating skimmer) and the rush of air into the drain line every few seconds is making the skimmer useless.

Any thoughts?

LMK if you need more information, i'll get back really fast =).

 

[razorfingerz]

maybe you should try a durso style stand pipe.. it fixed my noise really well.

 

[Joel A]

the size of the HOB overflow does not allow a durso to be used.

 

[Joel A]

with the airline out of one of the holes (was used to aspirate the line originally) the thing is sucking more air, and the flushing up and down sensation is gone, but it still is very loud...

the noise of the air rushing down through the holes in the cap that is...

 

[Joel A]

any help would be appreciated.. =)

It's noisy in the bed room and don't want to shut it down for the night...

 

[2_zoa]

The only way I know to make the air silent is to put a muffler on it and I don't know if you can call it silent. But really quite. And the other thing is you have to have an airline in the cap with only one hole.


I thought I read you can put a longer air line on it and push it into the pipe. You can tune it by putting the line in farther or pulling it out. Kinda like a Trombone slide. Also try increasing the size. Maybe some one else will chime in for you.

 

[Amedion]

Hole is to determine the water level. Since your standpipe is short, one inch can make a whole lot of different. I suggest using Air valve to control. Drill one hole at the end cap and fit it with airvalve.

 

[Joel A]

Amedion-what do you mean by air valve?


zoa- what do you mean by muffler? with the airline in the single hole, the water level still flushes up and down because there is not enough air getting into the drain.

 

[2_zoa]

Try a bigger air line then.

A muffler is an enclosed tube (like a pill bottle) with a hole on each end. The air line going into to stock man in one of the holes and then the other hole is a small piece of tubing that serves as the air intake. Both pieces of tubing will go into the pill bottle. Pushed in till they are just about to touch the other side. I will try to find the link to the build.

 

[Amedion]

<a href=showthread.php?s=&postid=13855477#post13855477 target=_blank>Originally posted</a> by Joander123
Amedion-what do you mean by air valve?


zoa- what do you mean by muffler? with the airline in the single hole, the water level still flushes up and down because there is not enough air getting into the drain.

I don't know how small is your "small" that you mentioned earlier.
A very tiny size of needle can bring a lot of different.

Plastic valve

 

[2_zoa]

Here page 10 of this thread is the silencer or muffler.

http://www.reefcentral.com/forums/showthread.php?threadid=1343381

 

[Joel A]

any other input?

 

[NanoReefWanabe]

how big is the plumbing and how many GPH is the pump after headloss calc?

 

[Joel A]

the plumbing on the drain is 1".

The return pump is a mag 9.5, but it has probably four feed of head pressure, and is throttled back by a ball valve.


It's been suggested that the overflow can't handle the return pump, but if that was the case, wouldn't i have a flood?

 

[Joel A]

with head loss taken into account, my pump should be pushing around 630 gph.

But, that is BEFORE i throttle it back with the ball valve, so i imagine with the ball valve probably more like 450-500 gph?

 

[Joel A]

anyone??

 

[Joel A]

well, i got rid of the noise of the overflow by throttling back my return pump even more... so maybe the stockpipe just couldn't handle the amount of flow i was giving it?

anyways, now i'm kinda back to square one, where i can't get any performance out of my skimmer now because of what i think are air surges getting into it (from the drain line).

The water bubbles in the skimmer will build up and rise up the neck of the skimmer, then a small short surge hits the skimmer from the feed line, and they all fall back down to the water level..

also, i am not getting any "foam" per say in the skimmer neck now, its all extremely wet bubbles...

any help?

 

[NanoReefWanabe]

1" will handle ~ 600gph at full siphon..your plumbing is a tad too big for the flow you are giving it...it takes the pump a second to catch up...if you can you can try to put a 3/4" barbed fitting on the bottom side of the bulkhead and run 3/4" vinyl to the sump...the added back pressure of the restricted line may help with the surging...

slowing the flow is basically preventing the drain line from starting a siphon...

or that is how i believe it works...for me i made my drain line 1.5" and dropped my flow to 300gph...now i have zero noise from the drain...an now crashing bubbles in the sump...i too started with a mag9 and a 1" durso..