Cellar management

The unglamorous work that determines beer quality. Daily routines, cleaning protocols, and the difference between a good brewery and a great one.

Brewers spend 80% of their time cleaning and managing tanks. The actual brewing — mash, boil, transfer — is maybe 20% of the work. The 80% determines whether your beer is consistently good or wildly variable.

Cellar management is the routine, repetitive, unglamorous work of running a brewery between brew days. It's where most quality problems come from and where most quality wins are made.

Daily tank rounds

Every fermenter and brite tank gets checked daily. The cellar operator walks every tank and records:

• Temperature: is the tank holding target? Glycol systems can drift; thermowells can fail.
• Pressure: for pressurized fermenters, what's the current PSI? Spunding valves can stick.
• Gravity: if fermentation is active, what's the current SG? Use a refractometer sample or in-line gravity sensor.
• pH: mid-fermentation pH drift can indicate stuck or wild fermentation.
• Visual check: krausen height and color, foam color, sediment, anything that looks off.
• Smell: open the tank top briefly; does it smell like fermenting beer or like something wrong?

Document everything. Spreadsheet, brewery management software, or paper log — doesn't matter, but capture the data. Patterns emerge over time. A tank that's running 1°F warm one week and 1°F warmer the next week is heading toward 5°F warm — catch it before fermentation goes off.

Fermentation temperature control

Fermentation temperature affects beer character more than any other single factor. A clean ale yeast at 64°F produces clean beer; the same yeast at 75°F produces fruity, fusel-y, hot-tasting beer.

Equipment for temp control:

• Glycol cooling system: $5,000-20,000 for a small brewery setup. Chiller + glycol tank + circulation pump. Pumps cold glycol through tank jackets.
• Tank jackets / dimple plates: built into the tank, or external wraps.
• Temperature controller per tank: the brain that opens/closes glycol valves to hold target.
• Insulation: tank insulation reduces glycol load and helps hold temp during power blips.

Common temp control problems:

• Underpowered glycol system: a 1-ton chiller can't cool 4 fermenters simultaneously during active fermentation. Sizing matters.
• Thermowell positioning: if the temperature probe is high up where the krausen sits, you're measuring krausen temp not beer temp.
• Glycol concentration drift: propylene glycol at the wrong concentration freezes or doesn't cool well. Check periodically.
• Heat exchanger fouling: in-line cooling between fermenter and conditioning tank can foul with yeast. Clean regularly.

CIP cycles (cleaning in place)

A fermenter just emptied of beer needs to be cleaned before the next batch goes in. CIP (clean-in-place) is the standardized procedure for cleaning a tank without disassembling it.

Standard CIP cycle:

1. Pre-rinse with water: 5-10 minutes at high flow. Removes loose yeast and trub.
2. Caustic cycle: 1-3% sodium hydroxide solution at 140-160°F, recirculated 30-45 minutes. Dissolves protein and organic residue.
3. Post-caustic rinse: water rinse until pH neutral.
4. Acid cycle: 1-2% phosphoric or nitric acid solution at room temp, 15-30 minutes. Removes mineral scale.
5. Final water rinse: ensures no acid residue.
6. Sanitization: peracetic acid (PAA) at 0.1-0.2% concentration, 10-15 minutes contact, no rinse required. Or iodophor at recommended concentration.

Total cycle: 90-150 minutes per tank. Most brewers run CIPs overnight or during low-activity periods.

CIP supplies (caustic, acid, PAA) are the largest non-ingredient consumable in a brewery. Budget $5-15 per CIP cycle in chemicals. For a 15-bbl tank cleaned weekly, that's $250-800/year per tank.

Yeast harvesting and management

Each fermentation produces 2-4x the yeast you pitched. Harvesting that yeast for the next batch saves cost and produces beer that's already adapted to your conditions.

Harvest protocol:

• After primary fermentation completes (gravity stable for 48 hours), drop yeast into a sanitized brink (storage tank) or jar.
• Cold-crash the fermenter: 35-40°F drops yeast.
• Collect yeast from bottom of fermenter: sloped-bottom fermenters make this easy via a dump valve.
• Discard the first portion: the first material out is usually trub and dead yeast.
• Collect the middle portion: healthy, viable yeast.
• Stop before getting the late portion: the late portion can include early-flocculating mutants.
• Store under cool refrigeration (32-38°F) with minimal air exposure.
• Use within 1-2 weeks for best results.

Generation tracking matters. After 8-10 generations, yeast tends to drift — flocculation behavior changes, attenuation creeps, off-flavor character emerges. Reset with fresh culture from a lab.

When to dump a batch

The dump decision is one of the hardest in brewing. Dumping a batch costs ingredients, labor, and tank time. NOT dumping a flawed batch costs reputation and customer trust.

Dump triggers:

• Active infection visible: pellicle on top, gushing fermentation past expected end, sour off-flavor.
• Wild yeast contamination: phenolic / clove off-flavor in styles that should be clean.
• Severe off-flavor that won't resolve: diacetyl that doesn't clean up after 5-day rest. Major DMS that didn't blow off.
• Failed sensory panel: if multiple staff members confirm the beer is unacceptable, dump.
• Equipment failure during fermentation: if temp control failed during active ferment, the beer may be compromised.

Healthy breweries dump less than 2% of total production. A brewery dumping 5%+ has a systemic problem to investigate.

Document every dump: batch ID, volume, date, reason. TTB requires it. Brewers Association quality programs use the data for improvement.

Transfer timing

When do you transfer beer from fermenter to brite tank or to packaging?

Standard ales: typically 7-14 days after pitching, after FG is stable for 48 hours, and after diacetyl rest (if needed). Transfer when:

• Gravity stable at target for 48 hours
• Diacetyl level acceptable (sensory panel)
• Yeast has dropped (most of it)
• Cold crash has settled solids

Lagers: similar timing for primary, but typically 4-8 weeks of cold conditioning (lagering) at 32-38°F before packaging.

NEIPAs: rush this process. 7-10 days total, fast cold crash, fast transfer, fast packaging. Long aging muddies hop character.

Big stouts and barrel-aged: long aging in conditioning tanks (or barrels). 6-18 months common.

Transfer protocols

Tank-to-tank transfers should:

• Be closed-pressure where possible. CO2 push from source tank to destination tank, both under positive pressure.
• Use purged destination tanks. Sanitize, fill with sanitizer, push out with CO2. Tank now full of CO2 instead of air.
• Avoid splashing. Fill destination tank from the bottom up to minimize oxygen pickup.
• Be done at appropriate temperature. Cold beer holds CO2 better; transferring cold reduces foaming.

For NEIPAs especially, the transfer is where most oxygen pickup happens. A transfer that introduces 100+ ppb DO can ruin an otherwise well-made beer.

Cleaning supplies inventory

Always-stock cellar consumables:

Run out of caustic mid-CIP and you've got a half-cleaned tank. Run out of PAA before packaging and you delay a release. Inventory matters.

Common mistakes

Skipping CIP between batches. "It looked clean" doesn't cut it. Bacterial film builds up invisibly. CIP every transfer.

Improper caustic concentration. Too weak and it doesn't clean. Too strong and it damages stainless seams over time and wastes chemical. Use a refractometer or titration to verify concentration.

Pushing yeast harvest past viability. Yeast from a 5-day cold-crashed tank is fine. Yeast from a 3-week tank may have crashed below 60% viability.

Not training new staff on CIP procedures. A new cellar operator doing CIP incorrectly will produce contaminated tanks for weeks before you catch it.

Treating maintenance as optional. Glycol systems need annual coolant tests. Pumps need monthly inspection. Gaskets fail without warning. Build a maintenance schedule.

Next steps

Cellar work intersects with lab work — see lab equipment basics for the testing that confirms your cellar protocols are working.

Yeast management connects to your first brewer's responsibilities. Many small breweries have the head brewer running cellar themselves; bigger ones split the roles.