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RE: Wet-dry standpipe size
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To: Aquatic-Plants at actwin_com (Aquatic-Plants)
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Subject: RE: Wet-dry standpipe size
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From: "David W. Webb" <dwebb at ti_com>
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Date: Tue, 16 Apr 1996 11:51:41 -0700
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Conversation-Id: <BMSMTP82967994511a0206807 at dlep1_itg.ti.com>
>From: Wilson <jwilson at mnw_net>
>
>By using a center breather pipe, you can regulate the "cone"
>the water forms as it goes down the pipe. By ensuring that the
>water flows smoothly, the noise goes away. The trick is in
>controlling the waters flow.
Wow, that's a good idea. I think I may try that on one of my standpipes to
hopefully reduce the amount of air that winds up going down the J-tube and
fouling one of the siphons on my half-filled 55g.
For my installation, I'd need to do it a little different because I don't use
a prefilter. (This would also tend to keep snails from going down.)
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Perforating the bottom of the tube would allow bubbles pulled down to escape
into the tube prior to getting sucked down the siphon (hopefully).
With this particular setup, I'm using 1/2" tubing for the standpipe, and the
standpipe only goes halfway up the tank. My problem is that the tank is 22"
tall and I have a loopback siphon that goes over the wall of the tank. If
medium to large sized air bubbles get pulled down the standpipe, the vacuum in
the higher-than-normal siphon can expand those bubbles enough to cause the
siphon to fail. By way of a faulty design layout, my CO2 injection dumps quite
a bit of bubbles right next to the surface skimmer. When I refresh a CO2
bottle, I tend to get far more siphon failures than when the bottle is on its
down-side. (I have a second, substrate-skimming loopback siphon that hasn't
failed to-date, and can take over the load as the water level rises above the
top of the surface-skimming siphon).
I think I'm going to try this with maybe some 1/4" i.d. tubing and see how it
works.
David W. Webb
Enterprise Computing Provisioning
Texas Instruments Inc. Dallas, TX USA
(214) 575-3443 (voice) MSGID: DAWB
(214) 575-4853 (fax) Internet: dwebb at ti_com
(214) 581-2380 (pager) Text Pager: pgr at ti_com Subj:PAGE:David Webb