Is there a way to determine gravity of the sparge?
My plan, & I will do this twice to collect the desired volumes.
mash 12# grain with 3 gallon H20.
Collect the first runnings in one bucket and then collect the sparge
in a seperate bucket.
I should then have approx 5 gallons of high grav and about 6 gallons
low gravity liquor.

how do I predict gravity / volume before and after boils?
If I'm shooting for OG 1.05, and my 6 gallons are say 1.045, how much
should I expect to collect in order to get 1.05.
Are there formula for this?

TIA

~Matt

Matt...

You're really in the guess-timate zone doing it this way. What you'll be
doing is taking two gravity readings and then coming up with something
approximating an average. You're really much better off doing a slow,
steady sparge and collect the runnings in one boilpot. Many years ago I
tried doing something like what you're contemplating and ended up with
some contamination problems in the second runoff batch. I like your
grain to water ratio, however.

Are you planning to do a PH test along the way?

Ken

Matt Schmidt wrote:
[color=blue]
>Is there a way to determine gravity of the sparge?
>My plan, & I will do this twice to collect the desired volumes.
>mash 12# grain with 3 gallon H20.
>Collect the first runnings in one bucket and then collect the sparge
>in a seperate bucket.
>I should then have approx 5 gallons of high grav and about 6 gallons
>low gravity liquor.
>
>how do I predict gravity / volume before and after boils?
>If I'm shooting for OG 1.05, and my 6 gallons are say 1.045, how much
>should I expect to collect in order to get 1.05.
>Are there formula for this?
>
>TIA
>
>~Matt
>
>[/color]

...
"Ken Montgomery" <k.montgomery1@comcast.net> wrote in message
news:3F14D0F1.9080903@comcast.net...[color=blue]
> Matt...
>
> You're really in the guess-timate zone doing it this way. What you'll be
> doing is taking two gravity readings and then coming up with something
> approximating an average. You're really much better off doing a slow,
> steady sparge and collect the runnings in one boilpot. Many years ago I
> tried doing something like what you're contemplating and ended up with
> some contamination problems in the second runoff batch. I like your
> grain to water ratio, however.
>
> Are you planning to do a PH test along the way?
>
> Ken
>
> Matt Schmidt wrote:
>[color=green]
> >Is there a way to determine gravity of the sparge?
> >My plan, & I will do this twice to collect the desired volumes.
> >mash 12# grain with 3 gallon H20.
> >Collect the first runnings in one bucket and then collect the sparge
> >in a seperate bucket.
> >I should then have approx 5 gallons of high grav and about 6 gallons
> >low gravity liquor.
> >
> >how do I predict gravity / volume before and after boils?
> >If I'm shooting for OG 1.05, and my 6 gallons are say 1.045, how much
> >should I expect to collect in order to get 1.05.
> >Are there formula for this?
> >
> >TIA
> >
> >~Matt
> >
> >[/color]
>[/color]

The process is called parti-gyle and it was used to make abbey ale, dubbels,
and trippels. The rough rule of thumb is that the first 1/3 of the sparge
has 50% of the sugars. If you sparge 6 gallons and keep the first 2 gallons
separate, it should be twice as strong as the other 4 gallons. Randy
Mosher's book has charts for it and everything else chartable as well.

-Bubbles-

"Matt Schmidt" <mschmidt@stradley.com> wrote in message
news:3a59bf88.0307070819.558903d7@posting.google.com...[color=blue]
> Is there a way to determine gravity of the sparge?
> My plan, & I will do this twice to collect the desired volumes.
> mash 12# grain with 3 gallon H20.
> Collect the first runnings in one bucket and then collect the sparge
> in a seperate bucket.
> I should then have approx 5 gallons of high grav and about 6 gallons
> low gravity liquor.
>
> how do I predict gravity / volume before and after boils?
> If I'm shooting for OG 1.05, and my 6 gallons are say 1.045, how much
> should I expect to collect in order to get 1.05.
> Are there formula for this?
>
> TIA
>
> ~Matt[/color]