Poochops GF Brewday #9 Thornbridge St Petersburg RIS

[Poochops]

Title: St Petersburg RIS

Brew Method: All Grain
Style Name: Foreign Extra Stout
Boil Time: 60 min
Batch Size: 23 liters (fermentor volume)
Boil Size: 28.5 liters
Boil Gravity: 1.060
Efficiency: 85% (brew house)


STATS:
Original Gravity: 1.075
Final Gravity: 1.014
ABV (standard): 7.93%
IBU (tinseth): 78.2
SRM (morey): 34.94

FERMENTABLES:
5 kg - United Kingdom - Maris Otter Pale (78.4%)
0.375 kg - Torrified Wheat (5.9%)
0.225 kg - United Kingdom - Chocolate (3.5%)
0.18 kg - United Kingdom - Roasted Barley (2.8%)
0.18 kg - United Kingdom - Extra Dark Crystal 160L (2.8%)
0.1 kg - United Kingdom - Peated Malt (1.6%)
0.27 kg - Brown Sugar (4.2%)
0.05 kg - United Kingdom - Black Patent (0.8%)

HOPS:
37.5 g - Galena, Type: Pellet, AA: 13, Use: Boil for 60 min, IBU: 49.09
12 g - Perle, Type: Pellet, AA: 8.2, Use: Boil for 60 min, IBU: 9.91
40 g - Magnum, Type: Pellet, AA: 15, Use: Whirlpool for 30 min at 80 degC, IBU: 13.04
40 g - Hallertau Mittelfruh, Type: Leaf/Whole, AA: 3.75, Use: Whirlpool for 30 min at 80 degC, IBU: 3.26
12 g - Sorachi Ace, Type: Leaf/Whole, AA: 11.1, Use: Whirlpool for 30 min at 80 deg C, IBU: 2.9

MASH GUIDELINES:
1) Infusion, Temp: 65 C, Time: 90 min, Amount: 18 L, Mash
2) Infusion, Temp: 75 C, Time: 10 min, Amount: 18 L, Mash out
3) Sparge, Temp: 75 C, Time: 20 min, Amount: 19 L, Sparge
Starting Mash Thickness: 3 L/kg

OTHER INGREDIENTS:
1 each - Protafloc, Time: 15 min, Type: Fining, Use: Boil

YEAST:
Safale S05

Really enjoyed this brew last year when someone posted on here that Thornbridge had a great deal on it and I bought a dozen bottles. I stumbled upon the brewers notes for this on another forum, they were really quite detailed and so the recipe I'm really happy with. I substituted vanguard hops with Hallertau, because GEB nor anywhere else for that matter stocks vanguard.

Used 37 litres water in total and ended up with 30.5 in the boiler, a little too much but preboil gravity was still 1.064. Mash ph 5.8. Boiled for an hour and a half in the end to reduce the extra volume and got about 26.5 litres post boil. There were a lot of leaf hops added at whirlpool, I can't wait till I've finished using the last of my leaf, it's a pain in the arse to clean up frankly, nevertheless put exactly 23 litres in the FV. Happy with that, OG was a little high at 1.078, worked out at 89% brewhouse, pretty standard now looking back at my notes, apart from one rogue brew.
Noticed a lot of wort going down the overflow at first even though I mashed in really thoroughly, so I raised the malt pipe after thirty minutes and gave it a good stir, the bottom of the grain bed was very tightly packed. I'm certain now that torrified wheat causes this, it seems to swell up slower than everything else and closes up the grain, anyhow the stir sorted it nicely.
Pitched 2 packs of S05 and fitted a blow off tube which I've never done before, I'll be interested to see how it ferments out as I've used CML yeast on all my AG brews so far, also there's a touch of peated malt in this it'll be interesting to see how it adds to the taste. My last RIS was a partial extract that was extremely roasty after 3 months conditioning but now it's excellent 9 months bottled and two dozen left. I plan to keep a pile of this one for the medium term as well.
Hoping tomorrow night not have a brown brain in my brewfridge!

 

[Poochops]

Well took a reading on this earlier and pleased to say it's dropped to 1.014 in 5 days, bang on target which surprised me a little because most every brew I've done has finished a little higher than planned so I'm very happy with that, 81% attenuation isn't what I'm used to. Gave it a little rouse and I'm going to leave it for another week at 21 degrees to completely finish before I cold crash.
One thing I noticed is the krausen ring in the FV was only about 30mm high, which given the OG and the pitch rate I'm very surprised at, I thought it might have gone off like a rocket hence the blow off tube. Not complaining but come to think of it in probably thirty brews I've never had more than about 50mm of krausen. Sample tasted great, very high hopes for this one.

 

[DoctorMick]

89% brewhouse? :shock: You use a GF right? I get about 73% on a good day but if I was doing such a strong brew I reckon that’d drop to about 70!

 

[Ajhutch]

Well took a reading on this earlier and pleased to say it's dropped to 1.014 in 5 days, bang on target which surprised me a little because most every brew I've done has finished a little higher than planned so I'm very happy with that, 81% attenuation isn't what I'm used to. Gave it a little rouse and I'm going to leave it for another week at 21 degrees to completely finish before I cold crash.
One thing I noticed is the krausen ring in the FV was only about 30mm high, which given the OG and the pitch rate I'm very surprised at, I thought it might have gone off like a rocket hence the blow off tube. Not complaining but come to think of it in probably thirty brews I've never had more than about 50mm of krausen. Sample tasted great, very high hopes for this one.

Sounds good. My imperial stout krausen climbed a couple of inches but no higher.


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[Poochops]

89% brewhouse? :shock: You use a GF right? I get about 73% on a good day but if I was doing such a strong brew I reckon that’d drop to about 70!

I know, I use brewers friend and just punch the numbers in as I go but it surprises me too. Of the five brews that I've tracked the measurements I've had 91, 90, 72, 95, and 89. There was a lot of extract in the 95 so discount that, and 72 I lost a lot of liquor to grain and even more to hops (it was a DIPA)
I tend now to assume 85% when planning the recipes but I'm going to dial that up a bit once I've used the grain kits I've already bought.
Not complaining like, I bought a kit for a 4.2% light English Ale, it only cost about 7 quid including first gold hops, there's only 3.5kg of grain in it!