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Brewery heat exchanger cleaning

When a wort cooler stops hitting pitching temperature and the usual caustic cycle no longer fixes it, the deposit has changed and not the cleaning. Send the unit details and what it is doing, and a specialist who cleans brewery plate packs will come back to you.

  • UnitsWort coolers, paraflows, condensers, glycol plates
  • DepositsBeerstone, protein, trub, hop resin, biofilm
  • Planned toBrew schedule and maintenance windows

Submit a cleaning request

Four steps: unit, deposit, postcode, contact details.

  1. 01Unit
  2. 02Situation
  3. 03Site
  4. 04Contact
What needs cleaning?

01What gets cleaned

Wort coolers foul with what the brew leaves behind, and condensers foul with what it carries over

Brewery heat exchanger cleaning starts from an unusual position: the plant is already cleaned every day. A brewery running caustic and acid through its wort cooler on a fixed cycle is not neglecting it. The reason a specialist gets called is that the routine has stopped working. Pitching temperature is drifting, the pressure drop is climbing, or a microbiological result has come back that points at the cooler instead of at the cellar.

01

Wort coolers and paraflows collect protein and trub before they collect scale

A plate wort cooler drops sixty degrees or more in a single pass, and cold break forms in exactly the place the plate pack is trying to move heat through. Protein, polyphenol and hop resin come out of the wort onto the plate surface and build in the low-velocity lanes at the edges of the herringbone. Beerstone follows: calcium oxalate crystallising into and around that organic layer, bonded to it instead of sitting on it. Once the two are combined, caustic alone cannot get at the mineral and acid alone cannot get at the protein.

Fouls with
Cold break protein, hop resin, polyphenol, calcium oxalate
First symptom
Pitching temperature drifting up, longer knockout, pressure drop rising
Watch for
Beerstone in the port areas, gasket swelling, plates sticking together
02

Biofilm in a cooler survives cleaning that the rest of the plant passes

The wort cooler sits on the cold side of the boil, which is the first point at which the process can be infected. Lactobacillus and pediococcus establish in the same plate crevices the protein occupies, and once they are inside an organic deposit they are protected from the caustic passing over the top of it. A brewery chasing a persistent spoilage result through the cellar and the fermenters is quite often looking in the wrong place, because the plate pack cannot be seen and everything else can.

Fouls with
Biofilm harbouring lactobacillus, pediococcus and wild yeast
First symptom
Recurring spoilage with no cellar cause, swabs clear but product not
Watch for
Deposit behind gaskets and in ports, which no CIP flow reaches
03

Distillery condensers and coolers foul with copper salts as well as with residue

Shell and tube condensers, worm tubs and spent lees coolers carry the same organic residue as brewing plant but add copper chemistry to it. Copper surfaces in contact with sulphur compounds in the vapour are doing useful work for the spirit, and the corrosion product that results deposits alongside the scale. Cleaning has to remove the fouling without stripping the copper the distillery depends on, which is a narrower chemistry window than a brewery needs.

Fouls with
Copper salts and verdigris, scale, residue, spent lees solids
First symptom
Condensing capacity down, spirit run slowing, cooling water outlet up
Watch for
Over-aggressive acid stripping copper, tube erosion at inlet ends

02What has built up

Beerstone needs two chemistries in sequence and one on its own will not shift it

The reason a standard caustic cycle stops working is not that the caustic is weak. It is that the deposit has become two deposits interlocked, and each one shields the other from the thing that would remove it.

DepositWhere it comes fromHow it is removed
BeerstoneCalcium oxalate from the malt crystallising onto the plate, growing into and around the protein layer already there.Acid after caustic, in sequence and with a rinse between. Neither alone reaches it once layered.
Two-stage CIP
Protein and cold breakHot and cold break coming out of solution across the wort cooler exactly where heat transfer happens.Hot caustic, or an enzymatic stage where the layer has set hard enough to resist it.
CIP / enzymatic
Hop resinAlpha acids and resins carried over from the boil, more pronounced on heavily hopped and dry-hopped production.Hot alkaline circulation with a surfactant. Temperature matters more than concentration.
CIP
BiofilmSpoilage organisms establishing in plate crevices and behind gaskets, protected inside the organic layer.Remove the deposit first, then sanitise. Sanitising over a biofilm achieves very little.
CIP + sanitise
Water scaleCalcium carbonate on the cooling water side, from liquor or from an untreated glycol or mains circuit.Inhibited acid circulation on the service side, separately from the product side.
CIP
Copper saltsDistillery condensers and worm tubs, where copper reacts with sulphur compounds in the vapour.Mild acid, controlled carefully. The aim is to clean the surface, never to strip the copper.
Controlled acid

03In place or off site

The question is not how to clean it but why the existing clean stopped working

A brewery already owns a CIP set and uses it daily. What a specialist adds is either a chemistry the site cannot run, or the strip that answers what the circulation cannot.

  1. 01

    A corrected two-stage CIP fixes most coolers without opening them

    Hot caustic to take the organic layer, a rinse, then acid to take the mineral, at the right temperature and contact time and with flow reversal part way through. Most breweries running into trouble are running one stage, running it cold, or running it too briefly, and correcting the cycle recovers the unit.

  2. 02

    Enzymatic cleaning reaches protein that caustic has already baked on

    Where repeated hot caustic has denatured the protein layer instead of removing it, enzyme formulations break it down at lower temperature without the aggression that shortens gasket life. It is slower than caustic and it is the sensible route on a pack that is otherwise sound.

  3. 03

    Stripping the pack is the only way to see what is behind the gaskets

    Circulation never touches the gasket groove or the port shadow, and those are where beerstone and biofilm persist. Opening the pack means every plate is cleaned and inspected individually, cracks are found before they become a cross-leak into the glycol, and the gasket set is assessed while it is accessible.

  4. 04

    Passivation after acid protects the stainless the acid has just stripped

    Acid cleaning removes the passive layer along with the deposit, and a plate returned to service without it will re-foul faster and pit sooner. Passivation restores the surface, and on product-contact plant it is part of the clean, not an extra.

04What happens next

Four steps take a fouled unit from enquiry to a tested return

The enquiry goes straight to a contractor who cleans that unit type. There is no qualifying call in between.

  1. You send the unit details, the deposit and the postcode.

  2. The enquiry goes to a specialist set up for that unit type and that fouling.

  3. They come back with method, timescale and price.

  4. The clean is carried out in place or off site, and the unit is tested before it goes back.

05Questions

Cycle chemistry, brew schedule and gasket life decide how brewery cleaning is planned

Why has our normal CIP stopped shifting it?

Almost always because the deposit is now two deposits. Caustic removes protein and does very little to calcium oxalate; acid removes the oxalate and does very little to protein. Once beerstone has grown into a protein layer, each shields the other and a single-stage cycle stops making progress no matter how hot or how strong it is run.

The fix is usually sequence rather than strength: caustic, rinse, acid, rinse, with enough contact time at temperature and a flow reversal part way through. Where that has already been tried and failed, the deposit has generally layered far enough that the pack needs opening.

What is beerstone?

Calcium oxalate, mostly. Oxalic acid from the malt combines with calcium in the liquor and crystallises out onto any surface the wort contacts, preferring one that already carries a protein film to nucleate on.

That preference is the important part. Beerstone is not a hard water scale sitting on clean steel. It is interlocked with organic material, so it behaves differently from the scale in the rest of the plant.

Can a wort cooler be cleaned between brews?

A corrected CIP cycle, yes, and that is normally where to start because it costs no production time. A full two-stage cycle with proper contact times is longer than a routine rinse but still fits most schedules.

Opening the pack does not fit between brews. Breaking, cleaning, inspecting, re-gasketing where needed and pressure testing is measured in days, so it belongs in a maintenance window or a seasonal shutdown, planned and not forced.

Could the cooler be causing our spoilage problem?

It is a common source and a commonly missed one. The wort cooler is the first point after the boil where the process can be infected. Biofilm inside a plate crevice or behind a gasket survives cleaning that the rest of the plant passes easily.

It is also the hardest place to sample. Swabs cannot reach a closed plate pack, so a brewery can return clean results everywhere it can test while the actual source stays hidden. If spoilage recurs with no cellar explanation, opening the pack is a reasonable diagnostic step instead of a last resort.

Do the gaskets have to be replaced?

Not automatically. Gaskets that are sound, in date and not bonded to the plate are re-used, and the set is assessed plate by plate once the pack is open.

They do need replacing more often than in most sectors, because repeated hot caustic and acid cycling is hard on nitrile and EPDM. Where they are near end of life, doing it during a clean is much cheaper than paying to break the same pack again a few months later.

Is the unit food safe when it comes back?

That is the point of the last stage, not an afterthought. A pack that has been opened is reassembled with food-grade gaskets, pressure tested, and given a final CIP and sanitisation before it sees wort.

Ask for the record. What was cleaned, what chemistry, what was replaced, what pressure it was tested to, and the final sanitisation. On product-contact plant that documentation is part of the deliverable.

What does brewery heat exchanger cleaning cost?

A corrected CIP with the site's own set and specialist chemistry is at the low end and often the whole answer. A strip, clean, inspect, re-gasket and test on a large plate pack is a different order of cost, and plate count drives it more than anything else.

The number that decides it is how many plates, and whether the gasket set is being renewed at the same time. Both are worth stating in the enquiry, because a quote without them is guesswork.

How often should a wort cooler be stripped?

Trend it rather than schedule it. Pitching temperature at a known wort flow, and the pressure drop across the cooler, are the two figures that say when circulation is no longer keeping up. Most breweries already record both.

As a rough shape, routine CIP every brew, a full two-stage cycle at a regular interval, and a strip when the trend says the circulation is losing ground or the gaskets are due. Heavily hopped production and hard liquor both shorten that considerably.

06Other industries

Fouling follows the process, so every sector fouls its exchangers differently

Food and dairyDenatured protein and milkstone baked onto pasteuriser plates, with hygiene standards to return to.food and dairy heat exchanger cleaning →PharmaceuticalProduct residue and biofilm on jacketed vessels and purified water circuits, with documentation to match.pharmaceutical heat exchanger cleaning →Chemical processingPolymer, salt and process solids on reactor coolers, condensers and interchangers.chemical plant heat exchanger cleaning →Power generationSilt, shell and biofilm through condenser tubes, and scale on auxiliary and lube oil coolers.power station heat exchanger cleaning →

A specialist who cleans that unit type answers the request

Unit, deposit and postcode are enough to start. Your details go to a specialist who cleans that unit type. No obligation.

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