CIP Cleaning in a Small Brewery: Equipment and Routine
Clean-in-place is the routine that decides whether your beer tastes the same every week. A small brewery needs a CIP unit with its own pump and heater, spray devices in every vessel, a documented sequence of caustic, rinse, acid and sanitiser, and a record of each cycle. Hermann has supplied brewing equipment for 23 years and lists cleaning equipment alongside mash, fermentation and filling, because a plant that cannot be cleaned reliably cannot be scheduled.
What follows is the loop, the chemistry in plain terms, and one set of water and energy figures you can check against your own plant.
Key takeaways
- Design the loop for contact time and flow, not for splash: pipes need a sustained flow to scrub the wall, and vessels need spray coverage over the whole head space.
- Caustic removes organic soil, acid removes beer stone and mineral scale, and sanitiser is applied last to a surface that is already clean.
- Keep a log per vessel and per line. A cycle you cannot date and initial is a cycle you cannot rely on when a batch tastes wrong.
- Budget cleaning water honestly: a modest 1,000 L four-tank brewery can use 1,500 litres of cleaning liquid a month on my worked assumptions below.
What a clean-in-place loop actually does
A CIP cycle is a sequence of liquids pushed through equipment in a controlled order, and each stage has a job. A hot caustic wash lifts organic soil, protein and hop residue from the surface. A rinse carries that soil away before it can redeposit. An acid wash dissolves mineral scale, including the beer stone that builds where hard water and wort meet. A final sanitiser reduces the surface population before the vessel is filled, and it only works on a surface the earlier stages already cleaned.
Four variables decide whether the sequence works: temperature, concentration, contact time and flow. Flow is the one small breweries get wrong most often, because a vessel that looks wet all over may still have unwashed shadows. Pipes are cleaned by velocity, and a useful design figure is a sustained flow fast enough to keep the liquid turbulent along the whole run. Vessels are cleaned by impingement, so the spray device has to reach the top of the side wall and the underside of the top plate, which is where a badly placed spray ball leaves a ring of soil above the beer line.
The equipment a small brewery needs
At the centre is a CIP unit: one or more dedicated tanks, a pump sized for the longest run in the plant, a heater, and a way to dose chemicals accurately. The unit should not be the brewhouse pump borrowed for the afternoon, because a pump that has to serve double duty will eventually be needed in two places at once.
Inside the vessels, you need a spray device chosen for the vessel diameter and height, plus a return path that lets the solution drain back to the unit without letting the pump run dry. Fermentation tanks, bright tanks, hoses, the filler and the transfer lines all need to be reachable by the same loop, and the pipework should be designed so that every low point drains and no dead leg holds stale liquid.
Around the loop sit the small items that decide whether the routine survives a busy week: sample valves you can dismantle, gaskets kept in date, a brush set for the parts the loop cannot reach, and an obvious place to hang the log sheet. The order the equipment arrives in matters too, since each shipment is inspected before it leaves the factory and travels with a checking list, and unpacking against that list is the moment to confirm that the CIP parts you ordered are the parts you received.
Chemistry, concentration and the records that prove it
Concentration is usually controlled by conductivity, which gives a repeatable signal without a laboratory. Whatever method you use, the numbers on the sheet should be concentrations and temperatures rather than ticks, because the point of a log is to show that the cycle met its conditions. Verification then comes from two cheap tests: a rinse-water check for the last traces of chemical, and a periodic swab or ATP test on a tank wall after cleaning.
Sanitiser choice deserves care for a second reason. Chlorine-based products are effective and inexpensive, but they are aggressive to stainless steel in high concentrations and over long contact times, and they attack copper outright. If chlorine is part of your routine, keep the concentration and the contact time inside the supplier's limits, rinse thoroughly, and keep the sanitiser away from any copper in the plant.
| Stage | Typical conditions | What it removes | Record to keep |
|---|---|---|---|
| Pre-rinse | Ambient water, short cycle | Loose soil and most of the sugar | Volume and duration per vessel |
| Caustic wash | Warm, dosed, circulated with flow | Protein, hop residue and organic film | Concentration, temperature, minutes |
| Intermediate rinse | Water until the return runs clear | Residual caustic and lifted soil | Rinse volume, visual check |
| Acid wash | Dosed, circulated | Beer stone and mineral scale | Concentration and contact time |
| Sanitiser | Per supplier limits, then drain | Surface organisms before filling | Product, strength, date, initials |
Worked example: water and energy for a four-tank brewery
My assumptions, stated so you can substitute your own figures: four fermentation vessels of 1,000 L, one cycle per vessel per batch, a caustic solution of 120 L per cycle dosed at 2 per cent, a 120 L intermediate rinse, a 60 L sanitiser charge, five brews a month, and a caustic temperature of 70 degrees Celsius reached from about 15 degrees.
Step one, liquid per cycle: 120 plus 120 plus 60 is 300 L. Step two, monthly cleaning liquid: 5 brews multiplied by 4 vessels multiplied by 300 L is 6,000 L, or 6 cubic metres. Step three, cleaning liquid against brewed wort: five brews of 1,000 L is 5,000 L of wort, so the cleaning liquid is 1.2 times the wort volume on this schedule, which is why CIP water is a real line in a brewery's water account rather than a rounding error.
Step four, chemical: 120 L at 2 per cent is 2.4 L of caustic per vessel cycle, so 20 cycles a month is about 48 L of caustic concentrate. Step five, heat: raising 120 L of water from 15 to 70 degrees Celsius lifts 120 kg by 55 kelvin, which at about 4.18 kilojoules per kilogram per kelvin is 120 multiplied by 4.18 multiplied by 55, or 27,588 kilojoules, about 7.7 kilowatt hours of heat per cycle. Across 20 cycles that is roughly 153 kilowatt hours a month, before any losses in the heater and the pipework.
Frequently asked questions
How often should a small brewery clean its fermentation tanks?
Clean and sanitise a vessel after every batch it holds, and clean transfer lines and hoses before and after each use. Sampling valves, filler heads and any part the loop cannot reach need a manual clean on the same schedule, with the cycle logged per vessel so you can trace a problem batch back to its cleaning record.
What equipment does a clean-in-place routine require?
A CIP unit with its own tanks, pump and heater, spray devices inside the vessels, a return path to the unit, pipework and hoses that drain completely, and a chemical dosing method you can verify. Published equipment lists cover cleaning and control equipment alongside mash, fermentation and filling plant.
Write the routine before you write the order
List every vessel, hose and line that will need cleaning, then decide how each one is reached by the loop and how the result will be recorded. That list is also the best way to catch design gaps early: a dead leg, a tank with one spray ball where it needs two, or a filler head nobody planned to dismantle. The equipment list published for a complete brewery system covers cleaning and control hardware alongside the brewing vessels, so a supplier can quote the whole loop instead of the tanks alone.
For the wider plant layout, the brewhouse pages show how vessel configurations are grouped, and the About Us page explains how a design proposal is built from a business plan. Send your line list with the enquiry and the answer you get back will be a cleaning design rather than a tank quotation.
Published equipment groups, the 6-year warranty on tank accessories and electronic components against manufacturing defects, and the 90 to 150 day delivery window come from the manufacturer's own website, read 23 Sept 2026; the water, chemical and energy figures above are my own arithmetic from the stated assumptions.[1]