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Old 01-19-2009, 04:21 PM   #1
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Default Fly Sparging flow rate?

Can someone tell how fast I should be fly sparging? Example: 1 gallon every 10 mins or 12.8 ounces per minute? I'm assuming the rate would be the same for both 5 / 10 gallon batch.

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Old 01-19-2009, 04:30 PM   #2
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I think the advised rate is about a gallon every four minutes or 0.25 gpm.

I run closer to 0.5-0.75 gpm because I don't like waiting and that is the rate that gets my efficiency to 75% (that's where I like it).

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Old 01-19-2009, 04:45 PM   #3
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Thanks for the quick response. I'll give .25 gpm a try this weekend. I hope the sparge arm will still roate at that rate. I'm using this one from midwest supplies Stainless Steel Sparge Arm :: Midwest Supplies Homebrewing and Winemaking Supplies

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Old 01-19-2009, 04:51 PM   #4
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Good luck!

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Old 01-19-2009, 05:13 PM   #5
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Quote:
Originally Posted by Boerderij_Kabouter View Post
I think the advised rate is about a gallon every four minutes or 0.25 gpm.

I run closer to 0.5-0.75 gpm because I don't like waiting and that is the rate that gets my efficiency to 75% (that's where I like it).
Palmer says 1 qt per minute, but for my system this would always result in severe channeling and lousy efficiency. The fastest I can sparge is about 1 pint per minute, and for higher gravity beers (> 1.065 OG), I drop this rate by about 1/3.

I think the real answer is that it depends on your equipment, the thickness of the mash, and the gravity of the wort, and quite possibly some other factors that I haven't considered.

Higher gravities require a longer sparge, as do shallower grain bed depths.

Whatever you do, stop sparging when the gravity of the runnings drops to about 1.010 (A refractometer is a great way to check for this).

An easy way to check for channeling is to measure the gravity of the final runnings, then add enough hot water to allow the grains to be stirred, and measure the gravity of the runnings after adding the extra water and stirring. If you have a channeling problem, the new runnings will have a higher gravity than the old.

-a.
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Old 01-19-2009, 05:26 PM   #6
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Originally Posted by ajf View Post
Palmer says 1 qt per minute, but for my system this would always result in severe channeling and lousy efficiency. The fastest I can sparge is about 1 pint per minute, and for higher gravity beers (> 1.065 OG), I drop this rate by about 1/3.


1 pint per minute....

2 pints per quart, 4 quarts per gallon. wow, that is 80 minutes for a 10g batch. What kind of efficiency do you sqweek out with that.
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Old 01-19-2009, 06:24 PM   #7
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1 pint per minute....

2 pints per quart, 4 quarts per gallon. wow, that is 80 minutes for a 10g batch. What kind of efficiency do you sqweek out with that.
Keep in mind he would be sparging with 10 Gallons minus the mash water. I guess this would be somewhere between 4-6 gallons depending on the style / grain bill. So it would be more like 40mins if you are sparging with 5 gallons of water at 1 Pint per minute or 1/8 Gallon. - is my math right ? lol

Sounds like I have some trial and error ahead of me. Anywhere between 1/4Gpm and 1/8Gpm. Does anyone have trouble getting the sparge arm to spin at that slow of a rate?

Thanks,
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Old 01-19-2009, 06:26 PM   #8
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for 5g batches, 85% with a 5g cooler, or 81% with 10g, and this stays constant for gravities up to 1.075. At those rates, I do get a little channeling with the 10g cooler, but none with the 5g

I'd be quite happy with 70%, but at Palmer's flow rates, it's less that 60%, and I have to stop the sparge before I collect the 7g I need before the boil.

-a.

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Old 01-19-2009, 06:35 PM   #9
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interesting. What drainage system do you use (braid, manifold, FB, etc.)?

I have never tested for channeling but now wonder if I could be having problems with it??? For the test you mentioned above, do you do a mini batch sparge? Or do you mean just add enough water so you mash is thinned a bit? I want to try this on my next brew.

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Old 01-19-2009, 07:09 PM   #10
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I use a false bottom.
For details on how I checked, see http://www.homebrewtalk.com/f36/chan...parging-53713/

That check was done with the 5g cooler. I repeated the check with the 10g a couple weeks ago, and found that after the stirring, my gravity had increased by about 0.012

-a.

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