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Old 03-18-2006, 08:57 PM   #1
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Default CPVC Manifold Question

I am making a new CPVC manifold for my mash tun.

Should I use holes or slots. If I use slots, should they face down (toward the bottom of the cooler) or up (facing the top of the cooler)?

Any recommendations?

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Old 03-18-2006, 09:26 PM   #2
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If you use slots, they should face down to the bottom of the cooler.

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Old 03-18-2006, 09:57 PM   #3
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Thanks! I thought that this would be the optimal way to do it. I read this website . . . which suggests that they face upward

I think that I will put mine toward the bottom of the cooler.

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Old 03-19-2006, 08:20 AM   #4
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I made a copper manifold and cut slots, about every 3/8 of an inch. Works great and not a stuck sparge yet. I followed the guidelines in www.howtobrew.com although I have the printed book.

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Old 03-19-2006, 12:44 PM   #5
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Palmer's book . . . at the website linked in Maestro's post above also shows the manifold slots facing upward.



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Old 03-19-2006, 06:06 PM   #6
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Quote:
Originally Posted by sonvolt
Palmer's book . . . at the website linked in Maestro's post above also shows the manifold slots facing upward.



The slots may be facing up for just the photo. Ifyou leave them like this, you'll leave 1/2" of sweet wort on the bottom of your cooler. Face them down and the siphon will suck up almost all of it.
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Old 03-19-2006, 06:10 PM   #7
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I remember reading that on brewingtechniques and IIRC it had something to do with the laminar flow on the bottom of the cooler and channeling. It doesn't make sense to me without going back to look at it, because the wort has to drain through the grainbed to reach the bottom of the cooler, at which point a laminar flow doesn't look like it would hurt anything (as it would if it were down the side, i.e., channeling around the grainbed).

I went with down for mine and it seems to work fine, as well as it seems to be the conventional wisdom these days. BT appears to have 'shutdown' around July '04, and many of the articles are from before that, so it's possible there are new ideas/thoughts on some of the topics.

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Old 03-19-2006, 10:21 PM   #8
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I put them facing down when I brewed today. My OG is higher than I expected it to be, so I am guessing this was the right choice.

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Old 03-19-2006, 10:52 PM   #9
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When I look at the picture of the mash tun displayed, I thiink it would be impossibe or impracticle to have the slots facing down . The fitting that the siphon hose is attached to would be facing down and the manifold would tilt down hill. The siphon hose would be going down to the bottom of the cooler and then have to make a sharp u turn to go up and out of the cooler. There would be such a kink in the hose that that it probably would not siphon. If you use that picture as a blueprint either cut the slots on the opposite side or turn the fitting in the opposite direction if you want the slots to face down.

The manifold I made drains through the bulkhead so I can flip it over and have the holes either up or down. I've used it once with the holes facing up. It worked perfictly. The nenxt time I may have the holes facing down.

David

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Old 03-19-2006, 10:57 PM   #10
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I just tested this actually...My brew with the slots UP, 81% efficiency. Slots DOWN, 68% efficiency.



Makes more sense to me to have them up, as long as they are thin enough to keep husks and grains out of the mainifold.

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