Standpipe Problems

balistidae · #1 09-06-2006, 02:58 AM

Hey everyone, i was wondering if anyone knows how to make a silent downpipe. I have tried stockmans and durso and just cant dial it in. Any help would be appreciated, thanks, Greg

albert_dao · #2 09-06-2006, 03:16 AM

I found the easiest way to dial the standpipe is to drill a large hole for the air intake and putting a valve on that.

If that didn't work for you, then.... you're out of luck?

Coderad · #3 09-06-2006, 03:24 AM

If you are talking in a overflow box. I use a straw and put it an inch or 2 down the tube, you could use an air hose. The slurping sound is the pipe sucking the air down.

albert_dao · #4 09-06-2006, 03:43 AM

Okay, CHECK IT OUT - I spent a lot of time on this, hope it clarifies things:

kwirky · #5 09-06-2006, 03:45 AM

nice drawing albert, you should apply at acad!

what do u mean "can't dial it in?"
do you mean the input from the tank is noisy, or where it's going to the sump?

here's an illustration of how I did my durso (this way is SO much easier, and cleaner looking than a standard durso):

if you find the water's rising up and down over n over within the standpipe, either drill a larger hole, or attach a piece of airline tubing. it means the water level's reaching higher than the air hole, breaking the siphon.

and for your return, this is what I wish I did, to stop most of the bubles, and get rid of the pip gurgle:

you can do away with "dialing in" your standpipe, by putting airline on the hole, then getting one of those powerhead venturi silencers... you won't hear a thing

albert_dao · #6 09-06-2006, 03:48 AM

Fist image is the Stockman.

For the second image, you'll actually want to increase the diameter of the pipe starting at the first 90 degree elbow to get the most use out of the design.

medican · #7 09-06-2006, 02:44 PM

I have had a stockman running on my 90 for over a year

This pic shows it stock with a hole and a tube to silence it.

I could not get it to work eather.

SO....I took the tube out and redrilled the hole on top and now works fine.

Its running about 1500gal through it and you might be surprized in the size of the hole.....I drilled and tested then drilled larger then tested....@ the rite hight its almost silent......

these were my first attept.........went very wrong........

Hope this helps.......

Midknight · #8 09-06-2006, 04:19 PM

Jumping on to watch the show.

balistidae · #9 09-06-2006, 11:27 PM

Just tried all the ideas...its now louder haha. anyone interested in prefabbing one for me?? name your price

Samw · #10 09-07-2006, 12:08 AM

I tried both Durso and Stockman's for my standpipe and both were loud. Then finally, I just took a pipe and drilled a whole bunch of holes randomly near the top of it and used that as the standpipe and it was dead silent. Its super simple and its been working for months. I don't know why no one else does it and what its drawbacks are. My flow is about 300GPH.

I figured that it is quiet because no whirlpool is created and there is no air being sucked down the pipe. The water is sucked down at full speed at the bottom holes while the water trickles in slowly at the top few holes so there is no splashing and almost no bubbles formed. The result is a quiet overflow with almost zero bubbles coming out of the return.