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My Mash Tun problem

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goscarletgry:
I have been brewing for over a year now and have decided to upgrade my all grain system. I went from having a 5 gallon cooler mash tun to now a 48qt 12 gal mash tun. I have made two batches on this mash tun and keep running into the same problem. When doing a 5gal batch in this 12 gal tun I leave 1-2 gal of wort in the tun. Is this tun too big for a 5 gal batch? Also I did not make a new manifold for this one yet. I just used the octagon manifold from my old round 5gal tun which only occupies half of the bottom of the tun. Would making a square manifold the occupies the entire bottom solve this?

Thanks

Mike K.

Dayton D.R.A.F.T. Home Brew Club

tygo:
A 48qt cooler is not too big for a 5 gallon batch.  I'm using a 70 qt cooler for my 5 gallon batches.  No matter what you're going to lose some volume.  The standard "absorption" number is 0.12 gallons per lb.  With my system it's usually more like 0.15 gallons per lb.  Either way, for say a batch with 12 lbs or so of grain you're going to lose the 1-2 gallons that you mention.

MrNate:
Not too big in my opinion. Copper manifold with slits on the bottom?

euge:
It might be worthwhile to investigate John Palmer's work on this. He's done the leg-work.

My suspicions are that a new manifold is needed.

BrewArk:

--- Quote from: goscarletgry on March 14, 2010, 08:25:36 PM ---... I just used the octagon manifold from my old round 5gal tun which only occupies half of the bottom of the tun. Would making a square manifold the occupies the entire bottom solve this?

--- End quote ---

If you are fly sparging, I would definitely recommend a new manifold.  If you are batch sparging it's a little less important, but if you are having recovery problems, it's probably worth the $ to have a manifold that matches your system.  If your manifold is costing you wort w/every batch, it'll pay for itself quickly enough.

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