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Old 12-23-2010, 09:53 AM   #31
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Posted these in my tank build but this is probably appropriate as well.

Here's what I came up with the stand pipe and the loc-line for the return. There's a 1/16' hole in the end cap of the stand pipe. I read to start there and drill out larger if needed.



I have the loc-line directing the return down the back wall and then the second output coming back and pointed towards the left wall of the tank. For the time being I'm going to use 3 or 4 Maxi-Jet 1200s to stir things up. I plan on upgrading to a couple Koralia 750s.



Over all shot from behind with components in place. Drain tube is 1.5" and after the sump is in place will basically go straight down into the first chamber. Vinyl return line is just sitting there. It's 1"" ID vinyl tubing which will go right onto the Mag 9.5" output then to the barb fitting. I still need to find an adapter for my Mag 7 output so that I can hook up my 3/4" ID tube to that for the skimmer.



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Old 12-26-2010, 09:59 AM   #32
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How large of a hole would you guys needs to be in the end cap of the stand pipe?

I have the tank up and running and have my Mag9.5 reduced to maybe %75 or so and everything is running pretty smooth. I figured the stand pipe would be able to flow more water than this and the water exiting into the sump (under water) is very bubbly.

The water line in the over flow is up over the elbow of the durso stand pipe and the stand pipe gurgles as it's draining. Is this because the hole in the end cap is still too small? I started with a 1/16" hole and have moved up to what looks like about 3/16". It hasn't seemed to do a whole lot.

What do you guys think? I just didn't want to drill out too large of a hole and mess something up.
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Old 12-26-2010, 12:06 PM   #33
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Keep increasing the hole size by 1/16, so try 1/4" next. The lower the flow the larger the hole.

Is the water level dropping and then rising in the overflow box?

Check out Air Hole & Water Level - Page 3
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Old 12-26-2010, 01:54 PM   #34
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When increased the pump rate it would fill up then drop. I think it was because my return pump was losing suction though. I haven't figured out how much water i need total just yet either. I will give that a read!
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Old 12-26-2010, 05:17 PM   #35
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Ok just read through that write up. It looks like my end cap hole might be a bit too large. If I increase the flow rate the water level in the overflow chamber increases but stays stable. Right now it's just to the top of the elbow. If I increase the flow more it rises and the stand pipe will make more noise. What should I do? It said I might need to redo the end cap with a smaller hole? I glued mine in place. I might just fill the hole with silicone and drill a new hole.

Also I made my stand pipe from 1" PVC and not the 1.25". Is that ok or wpuld that make a big difference?
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Old 12-30-2010, 11:05 AM   #36
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I've been battling this thing since day one. It seems like it will randomly drop water level in the overflow and suck air then go back up and stay there for a while. The water level will not stay level. If I cut back flow on the pump it will stay level but I feel like it's not draining anywhere near what it should be.

I read that the 1.25" standpipe works better than 1" so I think I'm going to drain the overflow tonight and pull the standpipe back out (which will require removing the bulkhead) and cutting it off then gluing on a 1.25" adapter so I can make the stand pipe out of 1.25".
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Old 12-30-2010, 12:22 PM   #37
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Sounds like a good idea. Also, never glue the end cap.
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Old 12-30-2010, 12:28 PM   #38
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Quote:
Originally Posted by cmor1701d View Post
Also, never glue the end cap.
Learned that the hard way. Looks like you're not supposed to glue the bottom of the tee fitting either. I came up with this idea which seems to work well for adjustment but I have a feeling the 1" standpipe is what is really restricting my setup. I'm going to pick up parts at lunch and try to get it done tonight. Won't be gluing the end cap or the tee fitting this time around!



Here's a shot of how the sump turned out. Works great. My only complaint is the return chamber is really small and it looks like evaporation is going to be a bit annoying.... Not bad for fitting all this in a 36" x 18" space if you ask me though!

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Old 12-30-2010, 04:42 PM   #39
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buy an auto top-off. i like the JBJ ATO. you can DIY it cheaper, but i use one of those on the gym tank and it behaves pretty well so far.

btw, are you sure that using a larger piece of pipe, running into the same size bulkhead is going to make a difference?
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Old 12-30-2010, 04:54 PM   #40
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I personally am not sure it will make a difference but on the durso site he states the following....

Quote:
PVC Size to Use

My tank has a 1 inch bulkhead on the bottom glass where the water drains out. For this size hole, I recommend you use 1 inch Schedule 26 PVC for the standpipe. I do not recommend 1 inch PVC as the larger fittings are much harder to fit inside overflow chamber (also called a weir). Secondly, there is no advantage in 1 inch over 1 inch PVC when dealing with a 1 inch bulkhead — the bulkhead is the limiting factor for the amount of water that can drain out.
These instructions assume you will be constructing a standpipe for a 1 inch threaded bulkhead.

To Oversize or Not to Oversize

With 1 inch and smaller bulkheads the standpipe's PVC diameter needs to be larger than the bulkhead to work correctly. I get a lot of e-mail questions on why this is. Honestly, I’m not sure. Typically if you use 1 inch PVC pipe on a 1 inch bulkhead you get poor results. (Some exceptions with smaller low flow tanks.) Take my word on it and use 1 inch PVC pipe. For large tanks with 1.5 inch bulkheads and large return pumps however, there does not seem to be any need to oversize the standpipe for larger bulkheads. Bulkheads 1.5 inches and larger can use PVC pipe & fittings that match the size of the bulkhead. (I consider tanks in the 350 gallon and up good candidates for 1.5 inch bulkheads).
I picked up all the parts at lunch time and the 1.25" stuff is pretty massive. I really hope it fits! The inside diameter is nearly 3/8" bigger since it's thinner wall pipe.
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