here goes nothin' - a DIY acrylic intake - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 03-23-2011, 09:21 PM Thread Starter
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here goes nothin' - a DIY acrylic intake

I've wanted to get rid of the green intake tube that came with my Eheim 2336 for a while, and suddenly I'm motivated to go for it!

I have a heat gun, time, and a plastic store nearby where I can get the equipment. But I wanted to make sure (cause I screwed this up before) which tube to buy before I get it.

The Eheim I THINK comes with that green tubing which is 16/22 - but with the current fitting the intake fits inside of the tube, so it would be slightly smaller than the inner diameter of the tubing. I assume people just slip it on.

The design will be pretty simple - a nice U-shaped bend over the top of the tank, then down about 7 inches and a right turn. Then I'll drill a ton of holes for the intake and slip a sponge over it. That part seems easy enough, but how do I determine the tubing size?



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post #2 of 5 (permalink) Old 03-23-2011, 11:17 PM
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My recommendation is to melt the bottom completely shut. Once this is done fill it with a nice clean silica sand and pack it in there tight. This will keep the nice rounded shape of the tube when you go to bend and make curves.


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post #3 of 5 (permalink) Old 03-23-2011, 11:36 PM Thread Starter
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I've done a few test bends and I've been able to make nice, clean bends without any trouble. What I'm trying to learn is the size of the tubing to buy!



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post #4 of 5 (permalink) Old 03-23-2011, 11:41 PM
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buy 16mm or 5/8. Though 5/8 could be a little loose. You can ALWAYS heat the tube in boiling water to stretch it. I have to use hose clamps.
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post #5 of 5 (permalink) Old 03-24-2011, 04:31 AM
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If it's 16/22 tube then that's the sizes right there, 16mm hole, 22mm outer.

But if you want to check to be sure..
If you have a Vernier handy just measure it (obviously) otherwise find a bit of paper, wrap it around the inside of the hose so it pokes out just a bit then cut through the edge to make a mark where it overlaps.
Take paper out of tube, lay it flat and measure between the marks you made (in mm) then divide this number by 3.1415 and that is your diameter of the tube inner, convert that to imperial and you have what you need.

You might have difficulty finding metric tube there (as much as I have finding imperial here) but 5/8" is 15.88mm which will fit inside then... hose clamp it I guess.
If you're going to clamp it I would either recommend the plastic ones that are used in irrigation as the stainless automotive ones sometimes contain a metal adjustment screw, or make one out of a piece of acrylic.
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