What This Article Answers
Fermentation tanks are the heart of your cellar. They determine how much beer you can produce, how consistent it tastes, and how often you clean. These are the questions that come up in every brewery project — and the answers you need before you order.

Q1: What is the difference between a fermenter, a brite tank, and a unitank?
A dedicated fermenter is a conical vessel for primary and secondary fermentation. It operates at low pressure. Beer transfers out to a brite tank for carbonation and packaging.

A brite tank is a pressure-rated vessel for clarifying, force-carbonating, and holding finished beer. It is not designed to ferment.

A unitank is a pressure-rated vessel that ferments and carbonates in the same tank. It skips the transfer step, saving floor space and reducing oxygen exposure — but it locks up the tank for the entire fermentation plus carbonation window.

The choice depends on your batch frequency and space. Unitanks save floor space. Dedicated fermenters plus brite tanks give you more scheduling flexibility.

Q2: What is the right pressure rating for a fermentation tank?
A fermentation tank should have a design pressure of 0.2 MPa and a test pressure of 0.3 MPa. These are the industry benchmarks you should verify before purchase. A tank that cannot hold pressure cannot carbonate beer or transfer under counter-pressure.

Q3: How much headspace do I need?
Standard tanks assume 15 to 20 percent headspace. For a high-gravity stout or a heavily dry-hopped IPA that produces aggressive krausen, you need 25 to 30 percent headspace. Without enough room, you either underfill the tank (losing yield) or risk blow-off losses that carry away yeast, hops, and aroma.

A custom tank can oversize the headspace without increasing total height beyond practical ceiling limits.

Q4: What cooling jacket design actually delivers consistent temperature?
Dimple jackets, half-pipe jackets, and full-coverage jackets perform differently. For precise lager fermentation, full-coverage jackets on both the body and cone are essential. Tanks with partial cooling coverage create temperature gradients that stress yeast and produce off-flavors.

One brewery that moved to custom fermentation tanks with three independent dimpled cooling jackets saw temperature variance drop from ±2.2°F to ±0.4°F across a 15-barrel batch.

Q5: What stainless steel grade should fermentation tanks use?
304 stainless steel is the industry standard for most fermentation tanks. It provides reliable corrosion resistance against wort, beer, and standard CIP chemicals.

316L stainless steel adds molybdenum for resistance to chloride-driven pitting. Choose 316L if your brewery is in a coastal area with high chloride in the air, if you brew sour beer or fruit beer, or if your water has elevated chloride levels.

The grade matters less than the weld quality. A 304 tank with proper orbital TIG welding and acid passivation will outlast a poorly welded 316L tank.

Q6: Can I clean fermentation tanks effectively with CIP?
Yes — but only if the tank was designed for it. Look for a CIP spray ball that provides 360-degree coverage, a tank interior with no dead corners, and a drainage slope that allows complete evacuation. Tank geometry that creates dead zones cannot be cleaned effectively regardless of chemical strength.

Ask your supplier for the CIP coverage test results. A tank with documented 99% surface coverage is different from one that just says "CIP-ready."

Q7: How many fermentation tanks do I need?
The standard ratio is 3:1 to 4:1 fermentation volume to brewhouse batch size. A 20-barrel brewhouse should have 60 to 80 barrels of total fermentation capacity. This allows you to brew consistently without waiting for tanks to free up.

If you brew multiple beer styles with different fermentation times, you need more tanks. A lager that ferments for 21 days occupies a tank three times longer than an ale that ferments for 7 days.

Trying to figure out the right fermentation tank mix for your brewery? We calculate tank count based on your actual batch schedule and beer styles — not on generic rules. Leave a message below with your brewhouse size and beer types, and we will send you a tank configuration proposal with occupancy calculations.