First Partial Mash Recipe

[BehrBrews]

I plan on starting into the world of partial mashes. The following recipe is a work in progress, my main concern is if I have enough grains to use convert the 1 lb of oats. Any other feed back would be greatly appreciated.

American Brown Ale


Type: Partial Mash
Batch Size: 5.50 gal

Ingredients

Amount Item Type % or IBU
7.00 lb Pale Liquid Extract (8.0 SRM) Extract 61.51 %
1.00 lb Caramel/Crystal Malt - 20L (20.0 SRM) Grain 8.79 %
1.00 lb Oats, Flaked (1.0 SRM) Grain 8.79 %
1.00 lb Pale Malt (2 Row) US (2.0 SRM) Grain 8.79 %
0.50 lb Cara-Pils/Dextrine (2.0 SRM) Grain 4.39 %
0.50 lb Caramel/Crystal Malt - 60L (60.0 SRM) Grain 4.39 %
0.25 lb Chocolate Malt (350.0 SRM) Grain 2.20 %
0.13 lb Black (Patent) Malt (500.0 SRM) Grain 1.14 %
1.00 oz Liberty [4.30 %] (60 min) Hops 13.4 IBU
2.00 oz Goldings, East Kent [5.00 %] (60 min) (First Wort Hop) Hops 34.2 IBU
1.00 oz Liberty [4.30 %] (30 min) (Aroma Hop-Steep) Hops -
0.75 oz Williamette [5.50 %] (5 min) Hops 2.6 IBU
1.00 items Whirlfloc Tablet (Boil 15.0 min) Misc
1 Pkgs Dry English Ale (White Labs #WLP007) Yeast-Ale

 

[malkore]

I have not myself used Oats in a mash (next brew though), but I have the feeling you're going to have a dense mash with so much oats...let alone conversion.

I would back way off on the oats, but see what others say first.

 

[scone]

How are you going to sparge this? Batch, or rinse, or a real sparge? If you are batch sparging or just rinsing (which is what I do with my partial mashes) the density probably won't be an issue. If you are sparging this you might want to add some rice hulls to thin it out.

As far as diastatic power, you're shooting for about 30 Lintner per pound of grain so let's take a look...

Lintner_for_batch = Σ(lintner_for_grain * weight_of_grain) / (total_batch_grain_weight)

* American 2 Row Pale Malt: 140 °L
* Crystal Malt (all): 0 °L
* Chocolate Malt: 0°L
* Black Patent Malts: 0 °L
* Carapils: 0 °L
* Flaked Oats: 0 °L

So basically your only contributing grain is your 2 row.

(1 * 140L) / (1 + 1 + 1 + 0.5 + 0.5 + 0.25 + 0.13) = ~31 <-- this is wrong, see post below

So it should just barely convert everything, though you're on the low end of whats required. I'd add a bit more 2-row to the mini-mash if you've got the space for it, mash for a full hour, and stir the mash a few times to make sure you get a good conversion.

EDIT: actually this is bad information, see post below

 

[BehrBrews]

Scone and Malkore thanks for the input.

For the diastatic power do i want to be as close to 30 as possible or is that a maximum. If I drop the oat down to 1/2 lb and add 1/2 a lb to the 2 Row that will bring me to 43 lintner per pound. Would this be a better adjustment for the recipe.

As for the type of sparge planned I'm not great with exact terms but I will be following the demo from DeathBrewer here.
https://www.homebrewtalk.com/f39/easy-partial-mash-brewing-pics-75231/
This would be closer to a Batch sparge then a rinse or real sparge correct?

Thanks again for helping to clear some of this up.

 

[scone]

Ah yes I should have specified. 30 is definitely the minimum, any lower and you can't get a full conversion. Your modification sounds like it could be the way to go, plus you can always swap in 6-row for the 2-row (it has 160 Lintner I think).

DeathBrewer's technique is a batch sparge, no rinse if I recall correctly. You should be fine without rice hulls.

 

[scone]

So I should add to this thread since I don't want to spread misinformation. I've been reading a lot more about mashing in general, and I was wrong in the above post. Not ALL of those grains NEED to be mashed since they are already converted (during the kilning process).

If I'm understanding things correctly now, the crystal malts, chocolate malts, black patent malts, and the carapils do not have any starches to convert, so they don't count towards the calculation of diastatic power. Here's a handy malt chart to show which malts need to be converted and which don't. https://www.homebrewtalk.com/wiki/index.php/Malts_Chart

Your 2-row and your flaked oats are all that needs to be converted, so the new equation becomes:

(1 * 140L) / (1 + 1) = 70

That's more than enough diastatic power to convert the oats and 2-row. Sorry about the false information above!

 

[BehrBrews]

Scone, Thanks for the correction. I brewed this recipe this weekend and was short on my predicted OG. I tried to crush the grains myself despite everything I've read on this forum, and I think I did not get the grains fine enough. Good thing it was a partial so I still have a shot at having a drinkable beer. Live and Learn. Thanks again for the help.