In spring 2023, a small craft brewery in Sturgeon Bay reached out about replacing their fermenter capacity. They had eight 175-gal stainless fermenters and were running at capacity. New stainless fermenters would have cost them around $4k apiece. They asked whether reconditioned food-grade IBCs would do the same job for less.
What we sold them
Twelve reconditioned 275-gallon food-grade caged HDPE totes. NSF gaskets, food-line wash, documented prior contents (corn syrup and HFCS exclusively). New 304 SS racking arms, new 2″ tri-clamp adapters, and a custom airlock setup. Total cost: about $5,800 for the dozen.
What worked
- Fermentation temperature held within ±0.5°F using a glycol jacket wrapped around each cage.
- Cleaning between batches was faster than expected. Their wash cycle took ~12 minutes per tote, well within their existing CIP capabilities.
- Footprint per gallon was better than the steel fermenters had been. The cage form factor stacked their cellar more efficiently.
- Two years in, leak rate across all twelve totes is zero. (We were nervous about the gaskets; they are doing fine.)
What did not
- The factory fill cap was not great for sanitary purposes. They custom-fabricated a tri-clamp adapter to replace it. Cost about $40 per tote.
- Light. HDPE transmits more visible light than they wanted for the lager fermenters. They wrapped four of the totes with light-blocking sleeves.
- Pressure rating. Standard IBCs are atmospheric. Their stout program had been pressure-conditioning in stainless. They moved that program to a separate steel vessel.
The economics
Their math: capital cost per gallon of fermentation capacity dropped from $22.86 (steel) to $1.76 (reconditioned IBC). About 13x. Even adding the custom fittings and sleeves, it is the cheapest fermenter capacity expansion they have ever done.
The catch is that not every brewing operation can go this route. Theirs is a small-batch craft program where atmospheric fermentation in food-grade plastic was always acceptable. A brewery with a pressure-conditioning program needs steel. A brewery with a regulator that classifies plastic differently might need to have a conversation. For the right operation, the trade is excellent.