Expanding tank capacity and when the numbers justify it

Start with the problem, not the tank

Breweries usually start talking about new tanks when beer runs out. Before buying, check that tank space really is the bottleneck. A brewery can run short because of a slow brewing schedule, long conditioning, a packaging line that limits throughput or simply poor planning. Each has a cheaper fix than a new fermenter.

Map a month: when each tank was full, empty, cleaning or waiting. If tanks sat empty for several days between batches, you have a scheduling problem, not a capacity problem.

Utilisation is the share of days a tank holds beer. Count it per tank over the last three months. Many breweries feel full at 70% because tanks are busy at the wrong times. A brewery consistently above about 85 to 90% has little room left for delays, a stuck fermentation or a sudden order.

Look at turnaround days by beer too. If one lager ties up a tank for six weeks, ask whether its sales justify that. Sometimes the right move is to brew it less often in bigger batches, or swap it for an ale that turns in two weeks.

Put a value on lost sales

The case for expansion rests on sales you are losing. Be specific. How many litres did outlets ask for that you could not supply? How many weeks did a core beer run out? If you run a brewpub, how many guests were told a beer was finished?

Turn that into litres a year, then into money. Use margin per litre after excise duty, ingredients, packaging and the variable cost of selling, not the menu price. Duty in India is high and varies by state, so a litre's contribution is far lower than its selling price suggests.

The payback sum

Here is a worked example with round numbers you should replace with your own:

• A new 2,000 litre fermenter on an ale schedule of 14 days at 80% use adds about 2,000 x 26 x 0.8, or roughly 41,600 litres a year.
• Say you can sell 30,000 of those litres, since new capacity rarely fills at once.
• Multiply by your margin per litre to get extra yearly contribution.
• Divide the tank's installed cost by that contribution to get payback in years.

Installed cost means everything: the tank, freight, rigging, glycol work, valves, platforms, any extra chiller capacity and the floor or drain work. Founders often count only the tank price.

Hidden costs that change the answer

More tanks bring more than more beer. They need more glycol cooling, which in a hot Indian summer can push your chiller past its limit. They need more cleaning chemicals, more labour hours and more keg or bottle capacity downstream. More output may also mean more licence volume. In many states, production volumes are recorded and approved by excise, so check your licence allows the higher output before you buy.

Finally, ask whether the market will take the beer. Our guide to opening a second outlet looks at growing demand rather than supply.

Cheaper ways to find capacity

• Shorten turnaround where quality allows, for example with better temperature control or a cleaner fermentation schedule.
• Move conditioning into bright tanks so fermenters turn faster.
• Brew double batches into larger tanks.
• Cut slow-selling beers from the core range.
• Use contract brewing for overflow volume.

Each of these frees tank days without a large capital spend. Try them first, then buy steel.

How investors look at it

If expansion needs outside money, investors will ask for the same sums: utilisation, lost sales, contribution per litre and payback. Have them ready in a clean spreadsheet. Our guide on pitching to angel investors covers what they look for. The founders who get funded are usually the ones who can show the bottleneck in data, not in adjectives.

Timing the order

Tanks are not off-the-shelf items. Fabrication, shipping and installation can take several months, so the decision to expand has to be made before the brewery is completely full. If utilisation is climbing past 80% and sales are still growing, start getting quotes. By the time a new tank is installed and commissioned, you will need it.

The best time to install is your quiet season. In much of India that is the monsoon, when beer sales often dip. Installing in March means rigging and commissioning during the run-up to the summer peak, which is the worst moment to lose a week of brewing.

Your first step

Pull three months of tank records and mark each day as full, empty, cleaning or waiting. Work out utilisation per tank. If the brewery is under 80%, fix the schedule before calling a supplier.

Common questions

What tank utilisation means a brewery is full?

Consistently above about 85 to 90% leaves little room for delays. Below about 80%, scheduling improvements usually free more capacity than new tanks.

How do I calculate payback on a new fermenter?

Estimate extra litres you can sell, multiply by margin per litre after duty and costs, then divide the full installed cost by that yearly contribution.

Do I need excise approval to increase production?

In many Indian states production is licensed and recorded, so check whether your licence allows higher output. Rules vary by state, so ask your licensing adviser.