When to take "into boil"-gravity?

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onkeltuka
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When to take "into boil"-gravity?

Post by onkeltuka » 3 years ago

The title says it all; at what point should I draw that sample?
"The rules for making hop additions during the boil are about as well defined as those for a knife fight." -Stan Hieronymus


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Post by Lylo » 3 years ago

You can take it any time after you have done all of your squeezing and water additions and before the boil starts. Just cool the wort in the fridge or use a hydro/temperature adjusting calculator. Or you can rattle PP's chain and just use a refractometer!!
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Post by onkeltuka » 3 years ago

OK, thanks! I've been drooling over those refractometers, they seem to make things easier?
"The rules for making hop additions during the boil are about as well defined as those for a knife fight." -Stan Hieronymus

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Post by mally » 3 years ago

onkeltuka wrote:OK, thanks! I've been drooling over those refractometers, they seem to make things easier?
Before you do, have a read of this.

I still use mine, and do prefer it to a hydro, but you do have to be aware of some of their pitfalls.
Last edited by mally on 21 Sep 2014, 15:29, edited 1 time in total.
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Post by Lylo » 3 years ago

I have one, and use it but always back up the critical (preboil, OSG and final) gravities with the hydro.
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Post by PistolPatch » 3 years ago

Lylo wrote:Or you can rattle PP's chain and just use a refractometer!!
:angry:

:P

Another thing to remember is that 'Gravity into Boil (GIB)' should always be coupled with a 'Volume into Boil (VIB)' measurement as what we really want to get from these two numbers is a pre-check on our kettle efficiency. VIB and GIB are hard numbers to measure so we can't give them too much weight. All they can do is act as a pre-check, our first kettle efficiency reading.

Anyone who has tried to take a Volume into Boil measurement knows it is hard to measure. You can turn off the flame but there is still swelling, rumbling etc carrying on at that stage.

Gravity into Boil measurements also have similar problems. For example, if you took it at mash temperature and had a crappy burner, there might be a lot of evaporation occurring between mashing out and reaching boiling point so your reading might be lower than if you took it when the boil started. Then again, if you take it at the start of boil and are using a hydrometer, you'll need to cover the sample to prevent evaporation whilst it cools.

Don't be too pedantic on this one. It is just a pre-check.

:peace:
Last edited by PistolPatch on 21 Sep 2014, 22:19, edited 1 time in total.
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