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Steve973 wrote:Hi, all. I have brewed twice on my MoreBeer sculpture. It's a 1550DD that I ordererd with 20g kettles, because I bought this sculpture before the release of the 2050. Unfortunately, my efficiency was pretty low on both occasions. This weekend, i was shooting for 1.074, but I got 1.060. I am trying to pinpoint where I went wrong. My grain bill consisted of:
28.0 lb (96.6%) Standard 2-Row; Rahr - added during mash
1.0 lb (3.4%) Victory® Malt; Briess - added during mash
I doughed-in with approximately 9 gallons of water at 167 degrees and mashed for an hour while circulating the entire time. The wort cleared up quite nicely by somewhere around the halfway point. I increased the HLT temperature to about 175 degrees to get the mash temp (slowly) up to 168 degrees. I sparged slowly, too. When I was calculating the water volume, I took the amount of water I needed, minus 2.75 gallons for the volume under the false bottom, multiplied by 0.83 to get the number of inches that I needed over the false bottom. For the mash kettle, I only took the water above the false bottom into consideration. My mash pH was 5.2, adjusted with lactic acid.
To me, this all sounds fairly good, but does anyone have any ideas where I might have gone wrong? I know this system is capable of awesome and predictable results, but I am getting less predictability with this system than I got with my 3-tier, gravity fed, cooler system that I previously used. I appreciate any help that anyone can give.
167 to me seems high unless you're target mash temp is 158+
You say "I sparged slowly" but what does that specifically mean
29 pounds of grain, at 70% efficiency, and I'm assuming because you don't say - a 10 gallon batch, should have yielded an OG of ~1.065. Shooting for 1.074 you would have needed an approx. eff. closer to 80% which may or may not be optimistic on that system. When you got 1.06 was it on 10 gallons or something larger?
pclemon wrote:Another thing I just thought of was if you're using the height to measure volume (.83") make sure this is correct... don't assume that if what you bought lists the kettle as 20 gallons and it's 20" tall that it's 1"/gallon. I have a "30 gallon" pot that once I took measurements on it, it is actually a 32.7 gallon pot.
Steve973 wrote:To answer your question about volume, we were targeting for a post-boil volume of 13 gallons because we added a lot of hops, and we will be adding a lot of hops to the fermenter. We wanted to ensure that we ended up with 10 gallons after dumping off the yeast, taking samples, and to compensate for the wort absorbed by the hops.
Steve973 wrote:So, after scaling the recipe to end up with 13 gallons at 68F, I used:
32.5 pounds of 2-row
1.1 pounds of victory malt
The original gravity was 1.060, so that is an efficiency of 64% which is pretty bad.
I calculate 72.5% - which, while not great, is far from atypical.
Steve973 wrote:I calculate 72.5% - which, while not great, is far from atypical.
Out of curiosity, how are you performing your calculation? As a sanity check, I used the calculator at http://www.brewersfriend.com/brewhouse-efficiency/ and I got the same result that BTP gave me:
Gravity at 100% Efficiency: 1.093 - max
Gravity at 75% Efficiency: 1.070
Efficiency: 64.60%
Points / Pound / Gallon (ppg): 23.2
Steve973 wrote:The I crushed my grain at the store. I plan on getting my own mill, but I haven't done that yet. That is the next thing I will buy.
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