Author: Henry Chen Publish Time: 2026-04-14 Origin: Jinan Cassman Machinery Co., Ltd.
Three years ago, a craft brewer named Marcus opened his dream brewery in Portland, Oregon. He'd spent two years perfecting his recipes on a borrowed system, saving every penny for his own equipment. When it came time to buy fermentation tanks, he made a common mistake: he bought tanks that were too small.
"I thought I'd grow into them," Marcus told me during a recent visit. "But I ended up with tanks that didn't match my brewhouse capacity, inefficient glycol cooling routing, and constant scheduling headaches. It took me 18 months and a lot of lost sales to fix."
Marcus's story illustrates a crucial truth: your beer fermentation tanks define your brewery's production capacity more than any other equipment. Unlike the brewhouse, which you might use daily, your fermentation tanks are constant fixtures that shape everything from your beer styles to your cash flow.
In this comprehensive guide, I'll share what we've learned from helping 500+ breweries worldwide select their fermentation equipment. Whether you're choosing your first tanks or expanding an existing cellar, this guide will help you make confident decisions.
Beer fermentation tanks—also called fermenters, fermentation vessels, or CCTs (Cylindrical Conical Tanks)—are where the magic of fermentation happens. After your brewhouse produces sweet wort, it travels to these tanks where yeast transforms sugars into alcohol and carbon dioxide.
Modern fermentation tanks are designed to:
Provide optimal fermentation environment: Temperature control, pressure management, and sanitary conditions within your beer fermentation tanks
Facilitate yeast management: Conical bottoms allow easy yeast harvesting and sediment removal
Enable carbonation: Many beer fermentation tanks double as serving or brite tanks
Maximize product quality: Proper design prevents oxidation and contamination
Body: Cylindrical stainless steel vessel with domed top and bottom
Conical Bottom: Tapering cone (typically 60-75° angle) for sediment collection
Dimple Jacket: Double-wall construction with channels for glycol cooling
Insulation: Polyurethane foam between inner and outer shells
Manway: Entry point for cleaning and inspection
Ports: Sample valves, pressure relief, glycol connections, racking arms
Understanding the different tank types helps you build the right system for your needs.
The industry standard for craft breweries, conical fermenters feature a cone-shaped bottom that naturally separates yeast and sediment from the finished beer.
Advantages:
Excellent yeast management—harvest from the cone
Easy sediment removal without transferring beer
Versatile—works for virtually any beer style
Scalable—available from 1BBL to 100BBL+
Can double as serving tanks with pressure capability
Disadvantages:
Higher initial cost than basic designs
Requires more vertical space due to cone
More complex cleaning requirements
Best For: Craft breweries of all sizes, especially those harvesting yeast for repitching
Cassman conical fermenters feature 60° cone angles for optimal yeast sedimentation, dual-stage dimple jacket cooling for precise temperature control, and pressure-rated construction for force carbonation capability.
Unitanks are specialized fermenters designed to handle both primary fermentation and carbonation/serving in a single vessel—hence the name "unitank" or "uni-tank."
Key Features:
Pressure-rated construction (typically 14-30 PSI)
Integrated carbonation stones
Bottom-fill capabilities
No moving parts in product zone
Single-vessel fermentation and serving
Advantages:
Eliminates need for separate brite/serving tanks
Reduces equipment cost and floor space
Minimizes product transfers and oxidation risk
Streamlines operations for small breweries
Disadvantages:
Tank is committed to one batch until served
Requires more complex CIP programming
Limited flexibility if tank scheduling changes
Best For: Taproom-focused breweries, nano breweries, brewpubs with limited space
Brite tanks—also called bright tanks, serving tanks, or conditioning tanks—are pressure-rated vessels designed for carbonation, conditioning, and serving beer.
Primary Functions:
Carbonation via carbonation stone
Final conditioning and flavor refinement
Storage before packaging or serving
Pressure serving directly to taps
Advantages:
Dedicated conditioning space
Allows faster turnaround of fermenters
Excellent for maintaining draft quality
Can serve multiple batches in sequence
Disadvantages:
Additional equipment cost
Requires separate conditioning time
More tanks needed overall
Best For: Breweries with significant draft distribution, those packaging into kegs and cans
Jacketed Tanks:
Double-wall construction with glycol cooling channels
Precise temperature control throughout fermentation
Essential for ales (typically 65-72°F/18-22°C) and lagers requiring cold temperatures (45-55°F/7-13°C)
Higher cost but essential for quality control
Unjacketed Tanks:
Single-wall vessels relying on ambient temperature
Only viable in very stable, cool climates
Limited temperature control
Generally not recommended for serious craft production
Recommendation: Always choose jacketed fermenters. The temperature control they provide is essential for consistent, quality beer and is non-negotiable for professional operations.
Tank sizing is where many breweries make costly mistakes. Getting this right shapes your entire production capacity.
Nominal Capacity: The tank's rated volume (e.g., 15BBL tank)
Working Volume: Actual volume you'll use (typically 80-90% of nominal, to allow for foam and headspace)
Maximum Volume: Highest safe fill level (never exceed 95%)
For a 15BBL tank:
Working volume: 12-13.5BBL
Allows 1.5-3BBL for blow-off and foam
Never fill above 14.25BBL
Step 1: Determine Weekly Production
How many barrels per week do you need to produce?
Step 2: Calculate Fermentation Time
Ales: 10-14 days typical
Lagers: 21-30+ days typical
Add 2-3 days for conditioning/carbonation
Step 3: Determine Required Tank Capacity
Formula: Weekly BBL × Fermentation Days ÷ 7 = Minimum Tank Capacity
Example:
Target: 50 BBL/week
Ales (12 days fermentation + 3 days conditioning = 15 days)
50 × 15 ÷ 7 = 107 BBL minimum tank capacity
With 15BBL tanks: 107 ÷ 15 = 7.1 tanks
Round up: 8 tanks minimum
Your fermentation tank capacity should be approximately 2-3× your brewhouse batch size for craft breweries. For example:
Brewhouse Size | Minimum Fermenter Capacity | Recommended Capacity |
7BBL | 14-21 BBL | 21-28 BBL |
15BBL | 30-45 BBL | 45-60 BBL |
30BBL | 60-90 BBL | 90-120 BBL |
This buffer allows for:
Multiple concurrent batches
Scheduling flexibility
Growth without immediately buying tanks
Seasonal style variations
Cassman offers fermentation tanks in all standard sizes from 1BBL pilot systems to 100BBL+ commercial vessels, and our team helps breweries calculate optimal tank counts based on their specific production plans.
The materials and construction quality of your fermentation tanks directly impact beer quality, durability, and long-term cost of ownership.
304 Stainless Steel:
Industry standard for most brewing applications
Excellent corrosion resistance
Good thermal conductivity for glycol cooling
Cost-effective for standard applications
316L Stainless Steel:
Enhanced corrosion resistance, especially against chlorides
Required for wine, cider, or sour beer applications
Superior surface finish potential
Higher cost but longer tank life
Recommendation: For standard beer brewing, 304 stainless is sufficient and cost-effective. Choose 316L for acidic environments, sour beer programs, or if your water chemistry requires extra protection.
The interior surface finish of fermentation tanks affects:
Cleanability (easier cleaning = lower contamination risk)
Beer contact quality (smoother = less bacterial harborage)
Overall tank hygiene
Standard Finish: Ra 0.8-1.2μm—suitable for most applications
Premium Finish: Ra ≤ 0.4μm—optimal for high-quality craft production
Mechanical Polish: Creates the smoothest, most hygienic surface
Cassman fermentation tanks feature Ra ≤ 0.4μm interior finish on all product-contact surfaces, exceeding industry standards for craft brewery applications.
Polyurethane (PU) Foam Insulation:
Standard insulation type, 50-80mm thickness
Reduces glycol consumption by 30-50%
Essential for maintaining fermentation temperatures
Must be properly injected to avoid voids
Dual-Stage Dimple Jackets:
Glycol flows through dimpled channels in tank walls
Provides even, efficient cooling distribution
Dual-stage allows different temperatures in cone vs. body
Essential for lager production
Glycol Cooling System Requirements:
Ensure adequate glycol chiller capacity
Plan cooling routing for multiple tanks
Consider flow rates and pressure requirements
Budget for glycol chiller separately from tanks
When comparing fermentation tanks, evaluate these critical features:
Range: -2°C to +30°C (28°F to 86°F) for versatility
Precision: ±0.5°C accuracy
Zones: Dual-zone cooling (body and cone) for lager production
Response: Fast temperature changes fordiacetyl rests and crash cooling
Fermentation pressure: 1-2 PSI relief for CO₂ escape
Serving pressure: 12-30 PSI for force carbonation
Test pressure: 2× working pressure for safety
PRV setting: Adjustable pressure relief valve
Pressure-rated tanks (unitanks) cost more but offer versatility for serving directly from fermentation tanks.
Essential Valves:
Sample valve (sanitary sampling without contamination)
Blow-off valve (fermentation relief)
racking arm (clean transfer of finished beer)
Bottom dump (complete emptying, yeast harvest)
Port Configuration:
Side manway vs. top manway (top preferred for cleaning access)
Adequate glycol connections (inlet/outlet)
Thermometer/probe wells
Carbonation stone port (if pressure-rated)
Adjustable legs for leveling
Casters for smaller tanks (optional)
Load capacity for full tanks
Floor drain clearance
Recommended Configuration:
1-3 tanks, 2-3 BBL capacity each
Can use unitanks to minimize equipment count
Budget for at least 6-8 tanks over 2 years
Jacketed construction essential
Considerations:
Space is precious—unitanks maximize efficiency
Growth projections may require reselling smaller tanks
Consider used equipment for first tanks
Recommended Configuration:
8-16 tanks minimum
Mix of fermenters and brite tanks (50/50 split)
Pressure-rated for serving flexibility
Room for expansion
Considerations:
Schedule tanks for 2-3 batches per week per tank
Brite tanks reduce fermenter turnaround time
Budget for future expansion capacity
Recommended Configuration:
20-40+ tanks
Dedicated brite tank cellar
Separate hot and cold glycol systems
Automated CIP systems
Considerations:
Tank scheduling software becomes valuable
Yeast propagation facilities for large volumes
Cold storage for crash cooling capacity
Redundancy planning for tank failures
Cassman works with breweries at all scales, providing configuration recommendations based on production goals, space constraints, and budget parameters.
Fermentation tank costs vary based on size, features, and quality level.
Tank Size | Basic Fermenter | Unitank | Premium Fermenter |
1BBL | $1,500-2,500 | $2,500-4,000 | $3,000-5,000 |
7BBL | $5,000-8,000 | $8,000-12,000 | $10,000-15,000 |
15BBL | $8,000-14,000 | $14,000-20,000 | $18,000-25,000 |
30BBL | $15,000-25,000 | $25,000-35,000 | $30,000-45,000 |
Glycol Chiller:
Separate purchase, essential for all jacketed tanks
$5,000-50,000 depending on capacity
Typically 20-30% of tank investment
Tank Calibration:
Tilted tanks for yeast collection require calibration
Professional leveling and installation
$500-2,000 per tank
Freight and Delivery:
Large tanks are expensive to ship
International shipping adds significant cost
Factor 10-20% of tank cost for logistics
Installation Labor:
Setting, leveling, connecting utilities
$1,000-5,000 depending on complexity
Local contractors often required
Accessories:
Sample valves, racking arms, carb stones: $200-500 each
Pressure gauges, thermometers: $50-200 each
Add 10-15% of tank cost for accessories
For a small craft brewery (7BBL brewhouse):
10× 15BBL fermentation tanks: $100,000-150,000
4× 15BBL brite tanks: $40,000-60,000
Glycol chiller system: $25,000-40,000
Accessories and installation: $20,000-35,000
Total fermentation system: $185,000-285,000
Cassman provides comprehensive proposals including all components, freight, and installation options. Our turnkey approach ensures you understand total project costs upfront.
Proper installation ensures your fermentation tanks perform optimally for decades.
Minimum Clearances:
24 inches (60cm) between tanks
36 inches (90cm) for maintenance access
6-8 feet ceiling height for tank cleaning
Floor rated for tank weight when full (tanks can weigh 10,000-30,000 lbs)
Layout Considerations:
Glycol supply and return routing
Tank leveling requirements
Manway access for cleaning
Spent yeast collection area
Tank identification and labeling
Glycol System:
Dedicated glycol chiller
Proper pipe sizing (typically 1-1.5 inch)
Circulation pumps
Expansion tank
Compressed Air:
Clean, oil-free air supply
80-100 PSI for CIP and purging
Air filtration recommended
CO₂ Management:
Venting for fermentation CO₂
Pressure relief routing
CO₂ recovery option for larger operations
Drains:
Floor drains rated for high volume
Hot and cold drainage
Spent yeast collection system
Cassman provides detailed installation specifications and P&ID diagrams with every project. Our installation teams serve 60+ countries, understanding local requirements and codes.
Well-maintained beer fermentation tanks provide decades of reliable service.
Check glycol temperatures and flow
Monitor fermentation activity (blow-off, temperature rise)
Record specific gravity samples
Check pressure readings
Visual inspection for leaks
CIP cycle review and optimization
Clean sample valves
Check and adjust pressure relief valves
Review and log tank performance
Deep clean glycol system
Inspect gaskets and seals
Check leveling
Verify temperature calibration
Inspect manway gaskets
Professional tank inspection
Replace wear parts (gaskets, valves)
Recalibrate sensors and gauges
Check insulation integrity
Review tank certification expiration
Proper maintenance extends tank life to 20+ years and ensures consistent beer quality from your beer fermentation tanks.
Learning from others' mistakes helps you make better decisions:
Marcus's story at the beginning of this guide is common. Calculate your actual needs based on your production plan, not just current sales. Add 30-50% capacity for growth.
Your fermentation tanks are only as good as your cooling system. An undersized glycol chiller means poor temperature control and inconsistent fermentation. Budget appropriately.
Running at 100% capacity means no flexibility for scheduling, maintenance, or growth. Always maintain 20-30% headroom in your tank count.
Used beer fermentation tanks may seem attractive, but hidden damage, uncertain history, and lack of warranty often make them false economies. Buy quality beer fermentation tanks the first time.
Buy tanks that work with your expansion plans. Consistent tank sizes and connection standards simplify future additions.
Written by Henry Chen (陈鸿林), CEO
With over 20 years of experience in craft beverage equipment, Henry Chen has helped 500+ breweries worldwide configure their perfect fermentation systems. As the founder and CEO of Cassman, he leads a team dedicated to transforming brewing visions into successful operations across 60+ countries. His expertise spans from small pilot systems to large-scale commercial installations, with particular focus on helping breweries optimize their production capacity and achieve consistent quality. Connect with Henry on Facebook or learn more about Cassman's fermentation solutions.
Selecting the right manufacturer for your beer fermentation tanks shapes your tank ownership experience.
Manufacturing Experience:
Years in business
Tanks produced
Markets served
Quality Certifications:
ISO, CE, ASME, UL standards
Material certifications
Pressure vessel certifications
Customization Capability:
Standard vs. custom sizes
Feature flexibility
Layout accommodation
Support Infrastructure:
Warranty terms (longer is better)
Spare parts availability
Technical support access
Installation services
Customer References:
Talk to existing customers
Visit installations if possible
Review online feedback
For 20 years, Cassman has been the trusted fermentation tank partner for breweries worldwide. Here's why:
500+ completed projects across 60+ countries
20 years of manufacturing excellence
3-5 year warranties on all equipment
316L stainless options for demanding applications
Ra ≤ 0.4μm surface finish for superior hygiene
Dual-stage dimple jackets for precision temperature control
Turnkey solutions from consultation to commissioning
Lifetime after-sales support for long-term partnership
Every Cassman tank is built to exceed industry standards, backed by our commitment to your brewery's success.
Your beer fermentation tanks are the foundation of your production capacity. They're not just vessels—they're the environment where your recipes become reality, where yeast performs its alchemy, and where your brand's quality is either maintained or compromised.
Take Marcus's lesson to heart: invest the time to understand your actual needs, plan for growth, and choose quality equipment from a partner who'll be with you for the long term.
Whether you're building your first brewery or expanding your existing capacity, Cassman is ready to help. Our team of brewing equipment specialists will work with you to configure the perfect fermentation system for your goals, budget, and space.
Ready to discuss your fermentation tank needs? Contact our team for a customized proposal and tank configuration recommendations.
A fermentation tank (fermenter) is designed for the fermentation process—converting wort to beer through yeast activity. It typically has conical bottoms for yeast collection and may not be pressure-rated for serving. A brite tank (bright beer tank) is designed for carbonation, conditioning, and serving. Brite tanks are always pressure-rated and often have carbonation stones. Many breweries use "unitanks" that combine both functions.
For a 7BBL brewhouse targeting 50 BBL/week of ales, you need approximately 20-30BBL of fermentation capacity, suggesting 4-5 tanks at 7BBL each. This allows 2 batches per tank per week, scheduling flexibility, and some growth buffer. For lagers with longer fermentation times (21+ days), you'd need significantly more capacity—potentially 8-10 tanks.
Match tank size to your brewhouse batch size for flexibility. If you brew 15BBL batches, 15BBL tanks work well—allows full-batch fermentations without dead space. Larger tanks (30BBL for a 15BBL brewhouse) work if you consistently brew double batches or want maximum efficiency. Avoid tanks larger than 2× your batch size to prevent extended turnaround and scheduling complexity.
Beer can safely remain in fermentation tanks through complete fermentation and conditioning. For ales, 14-21 days is typical. For lagers, 30-60 days is common. After fermentation completes and the beer is clear, you should transfer to brite tanks or package to avoid oxidation and flavor degradation. Tanks used as unitanks can hold carbonated beer for weeks when properly pressurized.
Quality 15BBL fermentation tanks range from $8,000-14,000 for standard fermenters, $14,000-20,000 for pressure-rated unitanks, and $18,000-25,000 for premium models with advanced features. Prices vary based on stainless grade, surface finish, pressure rating, accessories, and manufacturer. Budget an additional 30-40% of tank cost for glycol chiller, installation, and accessories.
Pressure rating is essential if you want to serve beer directly from fermentation tanks (unitank configuration) or carbonate during fermentation. Standard fermenters handle 2-5 PSI; pressure-rated tanks handle 12-30+ PSI. If all your beer goes to brite tanks first, standard fermenters suffice. For taproom operations or flexible configurations, pressure-rated tanks offer more versatility.
About Cassman
Jinan Cassman Machinery Co., Ltd. is a leading manufacturer of craft beverage equipment, serving breweries, wineries, and distilleries in 60+ countries. With 20 years of experience and 500+ completed projects, Cassman provides turnkey solutions from consultation through commissioning. All equipment carries 3-5 year warranties with lifetime after-sales support.
Learn more at www.cassmanmachine.com
