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Dry hopping has become the signature technique of modern craft brewing. Yet many breweries struggle with two persistent problems: oxygen pick-up during addition, and the difficulty of removing hop debris afterward. Procurement managers often ask: “What equipment do I need to dry hop safely and efficiently?”

The oxygen threat during dry hopping

Each time you open a fermenter port to add hops, you introduce atmospheric oxygen. Even 100 ppb of O₂ can oxidize hop oils, turning vibrant citrus notes into stale, onion-like flavours. The solution is a closed-loop dry hopping system—a hopper that allows you to load hops, purge with CO₂ or nitrogen, and inject them into the fermenter without breaking the seal.

Question: “What is the best way to add dry hops without oxygen ingress?”

We recommend a dry hop doser—a small pressure-rated vessel with a butterfly valve at the bottom. You load the hops, attach the doser to the fermenter's 4-inch port, evacuate air with CO₂ (three cycles), then open the valve. The hops fall in, the valve closes, and the fermenter remains under positive pressure. The entire operation takes under 5 minutes and keeps O₂ below 30 ppb.

Question: “How do I prevent hop particles from clogging my heat exchanger or transfer lines?”

Hop trub is fibrous and sticky. A standard transfer will drag it into your bright tank or filter. Our fermenters include a hop arrestor—a screened dip tube that separates the beer outlet from the sediment cone. For heavy dry-hopping, we also offer a hop separator that uses centrifugal force to separate particles before transfer, reducing downstream fouling.

Question: “Does the shape of the fermenter affect hop utilization?”

Yes. A flat-bottomed fermenter leaves hops scattered across the entire surface, making harvest difficult. A conical fermenter with a 60–65° cone collects hop debris and yeast together, allowing you to dump them from the bottom valve before transferring. We design our cones with a central dump port that handles up to 10 kg of dry hops per 20hL batch.

Question: “Can I dry hop under pressure to reduce foaming?”

Absolutely. Dry hopping releases nucleation sites that can cause gushing. Our fermenters are rated for 2.5 bar working pressure; we recommend maintaining 0.5–0.8 bar head pressure during dry hopping to suppress foaming and keep hop oils in solution.

Dry hopping is an art—but the equipment must be science

Invest in a system that protects your hop investment and minimizes labour. A closed doser, a robust cone, and a reliable separator will pay for themselves in reduced losses and superior hop expression.

→ Share your typical hop load (kg per batch) and your current dry-hopping method. Our process engineers will recommend a dry hop skid and cone design that eliminates oxygen and maximises extraction—complete with a layout drawing.