comparing different mashing techniques rims vs. herms vs. single infusion by: harold j. gulbransen...
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Comparing Different Mashing TechniquesRIMS vs. HERMS vs. Single Infusionby: Harold J. Gulbransen & Bob MacKay
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Is there a difference between HERMS & RIMS mashing?
• HERMS = heat exchange recirculating mash system
• RIMS = recirculating infusion mash system• Advantages over single infusion mashing
– Clearer wort– More precise temperature control– Perform more complex mash schedules
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Is there a difference between HERMS & RIMS mashing?
• Potential disadvantages– Requires a pump so added cost– Scorching the wort is possible with RIMS if the
pump fails– No scorching with HERMS as the wort never
contacts direct heat
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Controlling the Variables
• Brewed a Bock Bier to feature it’s malty character
• Same water profile – carbon filtered SD water• Same malts • Same sparging technique [batch sparge]• Same mash tun, kettle and chiller• Pitched same volume of yeast and feremented
all beers in 10 gallon corny kegs [same geometry] and in the same chest freezer using a Johnson Controller
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Recipe6.0 gallons32.5 IBU 75 min boil 18.7 SRM
54.2% Munich Malt 10L [Briess] 8.00 lbs
32.2% Pilsner Malt 2L [Briess] 4.75 lbs
6.8% Melanoidin 35oL 1.00 lbs
5.1% CaraMunich 0.75 lbs
1.7% Cafafa II 0.25 lbs
Rice Hulls 1.0 lbs
Carbon filtered SD water 22 qts [1.5 qts water/ 1 lb grain]
Sparge 18 qts 170 F [acidified w/ Phosphoric acid]
Hops: 25 gm Magnum 11.0% aa 60 min
25 gm Vanguard 4.7% aa 10 min
Yeast: White Labs WLP 810 [SF Lager] – 200 ml of yeast slurry
Fermentation temps: 50oF
Packaging: kegged & force carbonated – Beer Gun to fill Bottles
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HERMS & RIMS Mashing
Strike WaterGrainHERMSRIMS
Time [minutes]
Te
mp
era
ture
[
°F ]
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-10 0 10 20 30 40 50 60 7070
90
110
130
150
170
190
210
Single Infusion Mash
Strike WaterGrainMain Mash
Time [minutes]
Te
mp
era
ture
[
°F ]
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Wort Aeration with Oxygen & a SS Aeration Stone
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Next day: Single Infusion Mash
Thanks to Patrick
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Temperature control during fermentation
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Fermentation in a chest freezer with a thermostat
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Results:
HERMS RIMS Single Infusion
Pre-Boil Gravity 1.046 1.044 1.046
Pre-Boil Volume 8 gallons 8.4 gallons 8.1 gallons
Volume after boil 6.5 gallons 6.6 gallons 6.7 gallons
OG after boil 1.062 1.062 1.058FG after feremntation 1.020 1.020 1.021
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Evaluation of Head RetentionTime = 0 min.
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Evaluation of Head RetentionTime = 2 min.
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Evaluation of Head RetentionTime = 3 min.
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Evaluation of Head RetentionTime = 8 min.
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Evaluation of Head RetentionTime = 20 min.
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Evaluation of Head Retention
• Best to Worst:– HERMS– RIMS– Single Infusion Mash
Best Quality Head -RIMS – fine tan bubbles
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Flavor Profiles
JoAnne found HERMS the best tasting
Slight metallic flavor with RIMS beer
Single infusion had least body and was thinner than the other two.
QUAFF Consensus? Let’s vote
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Special Thanks to Bob MacKay
Was this helpful to you when considering what Mashing technique you will employee in the future?
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