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Home Brew Forums > Home Brewing Beer > DIY Projects > Kettles, Mash Tuns, & Hot Liquor Tanks > Manifold design question
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Old 01-27-2010, 01:18 PM   #1
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Default Manifold design question

I bought an Igloo 50-Qt square cooler last week for $10 and am trying to put a manifold made of CPVC pipe (1/2 inch) in the bottom. I've got a hole on the side level with the bottom for the drain, and had the pipe cut when I realized I had a choice about design. Better late than never, right

I've got two design and am wondering if there is an opinion (or data) supporting one over the other.

Original idea:


As I was putting it together I noticed I could do this:


In the first I was thinking slits along the long pieces and the short pieces.
In the second slits along the three long pieces. (you can see 4 slits already here before my cutting tool stopped cutting)

Any advice would be appreciated. Thanks

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Old 01-27-2010, 02:18 PM   #2
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If I were to choose one of those, it would be the second one. Simply because from what I've read (I'm no scientist, so I read books) you want to pick a method that gets wort from the farthest end of the manifold to the spigot in as little time as possible. The first design is causing the wort to sort of take a "side route" to the spigot.

If you were to turn the first design 90 degrees and build it so the center arm runs parallel to the spigot instead of perpendicular, you'd probably have a better design.

Just my thoughts... I'm no expert on manifold design.

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Old 01-27-2010, 02:22 PM   #3
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From those two I'd go with the second. Less parts, easier to clean, and the middle pipe likely won't do much. However shouldn't the entire assembly be larger and closer to the edge? I don't have my copy of How to Brew in front of me but Palmer's ideal designs cover more of the bottom.

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Old 01-27-2010, 02:33 PM   #4
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Quote:
Originally Posted by DavidP View Post
From those two I'd go with the second. Less parts, easier to clean, and the middle pipe likely won't do much. However shouldn't the entire assembly be larger and closer to the edge? I don't have my copy of How to Brew in front of me but Palmer's ideal designs cover more of the bottom.
+1 on Palmer's design suggestions. The outer manifold tubes should be about 2" from the MLT wall. The space between manifold tubes should be about 4". Definitely check out http://www.howtobrew.com/appendices/appendixD.html

Very good read to understand why the spacing is crucial to flow/extraction.
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Old 01-27-2010, 02:42 PM   #5
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The second one. Although you probably would be just find with the first variant.

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Old 01-27-2010, 03:09 PM   #6
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Since you started a thread up about manifold design...

Im getting a cylindrical beverage cooler from a friend and i was contemplating building a round, spiraled manifold out of flexible copper tubing. Do you all think this would be more similar to a false bottom or a regular manifold? Is it worth doing?

BJ

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Old 01-27-2010, 03:44 PM   #7
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I think a round manifold would work just fine. Something to think about when making a rectangular/square manifold, is to put in a center strut which then attaches to your outlet. I have found that a center tap helps with getting a more even flow of wort (I've actually measured this with my arduino/3xL34 setup).

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Old 01-27-2010, 03:53 PM   #8
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Awesome
Thanks for the suggestions guys. ShaggyT, the reading link was helpful. I'd seen this a long time ago, but had totally forgotten about it.

The inside of the cooler is 12"x12" so I had been thinking 3"-pipe-5"-pipe-3" for this

If I by a 4-way I can make this 2"-pipe-3.25"-pipe-3.25"-pipe-2".

I have about 30 inches of pipe left to work with. I should have asked first

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Old 01-27-2010, 06:08 PM   #9
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I may be wrong, but I heard that if you are not fly-sparging, the manifold design is not that important for flow. You will be rinsing the sugars from the grain when you add your batch sparge water and mix it up.

With fly sparging, some of the grain may not be introduced to clean water and not get rinsed as well. (If your manifold is poorly designed).

I like the second design better. Simpler and looks to be as effective.

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Old 01-27-2010, 06:15 PM   #10
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Quote:
Originally Posted by brianj434 View Post
Since you started a thread up about manifold design...

Im getting a cylindrical beverage cooler from a friend and i was contemplating building a round, spiraled manifold out of flexible copper tubing. Do you all think this would be more similar to a false bottom or a regular manifold? Is it worth doing?

BJ
I also have a round cooler, and (as many people have) I looked to Palmer for my design. He says that a round manifold is almost exactly as effective as a false bottom (if you keep it the right distance from the wall). You are continuous/fly sparging, right? Otherwise, it doesn't matter so much.
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