### Author Topic: Help with mash tun size  (Read 1549 times)

• 1st Kit
• Posts: 18
##### Help with mash tun size
« on: March 14, 2013, 10:13:16 AM »
I'm in the process of setting up a HERMs system and need help determine what size mash tun would be best.  I'm looking at a kettle that is either 12.75 (10-15 Gal) or 15.75 inches (20 Gal) in diameter.  I like to brew both 5 and 10 gallon batches so I'll be using any where from 8 lbs of grain on up.  I'm not sure how to calculate what the grain bed depth would be. I'm concerned that if I go with the larger kettle I will have problems with some smaller beers, or if I go with a smaller kettle bigger beers will be an issue.  Any help/suggestions is greatly appreciated!

#### mtnrockhopper

• Brewmaster General
• Posts: 2288
• Delaware
##### Re: Help with mash tun size
« Reply #1 on: March 14, 2013, 10:41:49 AM »
The "Can I Mash It?" calculator here will help you determine what size beers will fit in each. My 10gallon mash tun will fit ~21lbs grain with 1.5qts water/lb.

http://www.rackers.org/calcs.shtml

About grain bed depth, if you have some grain, Measure a gallon of grain and weight it to get gallons/lb.  My guess is around 6lb per gallon based on some buckets of grain at home.

The volume of those kettles is pi*radius^2 per vertical inch (in cubic inches) - or -

Small: 6.375^2 * 3.1415 = 127.67 cubic inches = 0.55 gallons/inch
Large: 7.875^2 * 3.1415 = 194.82 cubic inches = 0.84 gallons/inch

Jimmy K
Flukes Craft Ales (not commercial)
Delmarva United Homebrewers - president by mob election
AHA Member since uhh, well, it's been years anyway
Newly annointed BJCP judge

• 1st Kit
• Posts: 18
##### Re: Help with mash tun size
« Reply #2 on: March 14, 2013, 05:37:22 PM »
Sounds like I should go with the smaller size!  Thanks for the help!

#### AmandaK

• Brewmaster
• Posts: 647
• Redbird Brewhouse
##### Re: Help with mash tun size
« Reply #3 on: March 15, 2013, 06:06:54 AM »
Here's a good, quick and dirty picture:
Amanda Kertz
Kansas City Bier Meister
BJCP National

#### gmac

• Senior Brewmaster
• Posts: 1863
• London, Ontario
##### Re: Help with mash tun size
« Reply #4 on: March 18, 2013, 07:19:21 AM »
Maybe a dumb question but does this calculator work for batch sparging too?  I want to go to 20 gal batches and want to make sure I get a cooler big enough for batches up to 1.065 at at least 1.5 qt/lb, preferably 2.
You know the thing about a shark? It's got lifeless eyes, black eyes...like a doll's eyes.

#### denny

• I must live here
• Posts: 10700
• Noti OR [1991.4, 287.6deg] AR
##### Re: Help with mash tun size
« Reply #5 on: March 18, 2013, 09:46:09 AM »
Graham, this one might help, too.

http://www.rackers.org/calcs.shtml
Life begins at 60.....1.060, that is!

www.dennybrew.com

The best, sharpest, funniest, weirdest and most knowledgable minds in home brewing contribute on the AHA forum. - Alewyfe

#### gmac

• Senior Brewmaster
• Posts: 1863
• London, Ontario
##### Re: Help with mash tun size
« Reply #6 on: March 18, 2013, 07:57:46 PM »
Thanks Denny.  That's the one I was referring to.  Mtnrockhopper above mentioned that one.
How big is your "Malt Coffin"?
You know the thing about a shark? It's got lifeless eyes, black eyes...like a doll's eyes.

#### denny

• I must live here
• Posts: 10700
• Noti OR [1991.4, 287.6deg] AR
##### Help with mash tun size
« Reply #7 on: March 18, 2013, 08:32:12 PM »
Thanks Denny.  That's the one I was referring to.  Mtnrockhopper above mentioned that one.
How big is your "Malt Coffin"?

Oops, missed the link above.  The mash coffin is 152 qt.  I've had 75 lb. of grain in it at 1.5 qt./lb. with room to spare.
Life begins at 60.....1.060, that is!

www.dennybrew.com

The best, sharpest, funniest, weirdest and most knowledgable minds in home brewing contribute on the AHA forum. - Alewyfe

#### gmac

• Senior Brewmaster
• Posts: 1863
• London, Ontario
##### Re: Help with mash tun size
« Reply #8 on: March 18, 2013, 08:37:33 PM »
I'm looking at 150 qt but they only come in green or white. No Blue so I don't know what to do.
You know the thing about a shark? It's got lifeless eyes, black eyes...like a doll's eyes.

#### denny

• I must live here
• Posts: 10700
• Noti OR [1991.4, 287.6deg] AR
##### Help with mash tun size
« Reply #9 on: March 18, 2013, 08:51:04 PM »
I'm looking at 150 qt but they only come in green or white. No Blue so I don't know what to do.

My dirty secret...my 152 is white.....ssssshhhhh.......
Life begins at 60.....1.060, that is!

www.dennybrew.com

The best, sharpest, funniest, weirdest and most knowledgable minds in home brewing contribute on the AHA forum. - Alewyfe

#### mtnrockhopper

• Brewmaster General
• Posts: 2288
• Delaware
##### Re: Help with mash tun size
« Reply #10 on: March 19, 2013, 05:42:36 AM »
I'm looking at 150 qt but they only come in green or white. No Blue so I don't know what to do.

My dirty secret...my 152 is white.....ssssshhhhh.......
AAAAAAAAAAAARRRHHHHHHHHHhhhhhhhhhhhh!!!.....  //sobbing//
Jimmy K
Flukes Craft Ales (not commercial)
Delmarva United Homebrewers - president by mob election
AHA Member since uhh, well, it's been years anyway
Newly annointed BJCP judge

#### beersk

• Senior Brewmaster
• Posts: 1656
• In the night!
##### Re: Help with mash tun size
« Reply #11 on: March 19, 2013, 09:30:17 AM »
I'm looking at 150 qt but they only come in green or white. No Blue so I don't know what to do.

My dirty secret...my 152 is white.....ssssshhhhh.......
And now we know the truth!
Watch out for those Cross Dressing Amateurs!

#### hopfenundmalz

• Official Poobah of No Life.
• Posts: 3889
• Milford, MI
##### Re: Help with mash tun size
« Reply #12 on: March 19, 2013, 09:48:49 AM »
I'm looking at 150 qt but they only come in green or white. No Blue so I don't know what to do.

My dirty secret...my 152 is white.....ssssshhhhh.......
Amanda K needs more rows on her table/spreadsheet.

Jeff Rankert
Ann Arbor Brewers Guild
AHA Member
[23.5, 30.5] Apparent Rennerian
Homebrewing, not just a hobby, it is a lifestyle!