A fifteen-barrel brewhouse does not have one tote application. It has five, each wanting a different grade and sometimes a different seat material. The glycol loop is the one most worth getting right, because contaminating it is expensive in a way the others are not.
What the glycol tote is doing
Holding the reservoir for your chiller loop, topping it up, and occasionally receiving a drained charge during maintenance. It is not a process vessel and it does not touch product, which means the requirements are lower than brewers often assume — with one significant exception we will come to.
Propylene glycol at 30 to 40 per cent in water is the normal working fluid. Specific gravity around 1.04, so a full 275 gallon unit is roughly 2,526 pounds. Entirely benign against HDPE and against EPDM seats.
Which grade
Grade B. There is no operational argument for Grade A on a glycol reservoir — you are paying for cosmetic condition on a tote that lives behind the fermenters. A sound, leak-tested Grade B unit with a fresh EPDM seat does the job for years.
The exception is the one rule worth being rigid about: do not use a unit whose prior cargo you cannot document. A glycol loop is a closed system that touches your jackets, and anything that leaches out of a bottle wall over months ends up circulating through the brewery. This is one of the few places where we recommend a documented food-history unit even though the glycol never touches beer.
The mistake that costs a system
Rotating a tote between duties. A unit that held CIP caustic last month and glycol this month is carrying residual caustic into your chiller loop, where it will attack solder joints, gaskets and anything aluminium.
Dedicate your units. Permanently. Not with a marker pen that washes off, but with a bolt-on plate. We fabricate these for a few dollars and they have prevented a great deal of expensive confusion. Label them GLYCOL, CAUSTIC, ACID, GRAIN and WATER, and never swap them, even once, even in a hurry.
The other four duties, briefly
- CIP caustic. Grade C is fine. EPDM seat. The cargo stains everything and nobody cares.
- CIP acid (phosphoric or peracid). Grade C, EPDM seat. Peracid degasses — use a vented lid, always.
- Spent grain or trub for farm collection. Grade C, vented lid, and do not leave it over a warm weekend. It keeps fermenting, produces gas and will deform a sealed bottle faster than you would believe.
- Cleaning and dilution water. Grade C. The cheapest thing we sell and perfectly adequate.
Anything touching wort or finished product is a different conversation entirely: documented food-history Grade A only, with the prior-cargo declaration in your file. No shortcuts there and we will not sell you one.
Sizing the reservoir
One 275 gallon unit covers top-up and a partial drain for most small systems. If you want to be able to drain the whole loop into storage during maintenance, work out your actual system volume first — jackets, lines, chiller and reservoir — and size for that plus twenty per cent. A pair of linked totes manifolded at the base gives you 550 gallons without a single component you cannot move through a doorway.
Practical fittings
S60x6 male to 2 inch NPT female adapter, then whatever your pump wants. A float level gauge on the side is worth the small cost — glycol loss is slow and invisible until something runs warm. A lockable valve cover is worth it too if the tote lives anywhere the public can reach.
Buying small, which is normal here
Breweries are our fastest-growing sector and almost all of them buy two to eight units at a time. There is no minimum order. If you are within driving distance, yard pickup is the cheapest route by a distance; if you are not, grouping an order with two other breweries in your city turns three LTL charges into one partial truckload.
Tell us all five duties at once and we will spec each one separately on a single quote. More on the sector on the breweries page.
Concentration, and why it matters more than volume
Propylene glycol is sold concentrated and run diluted. The working concentration sets the freeze protection and the heat transfer efficiency, and the two pull in opposite directions — more glycol means better freeze protection and worse heat transfer.
Most brewery chiller loops run somewhere between 30 and 40 per cent. Below about 25 per cent you are losing meaningful freeze protection; above 50 you are losing meaningful cooling capacity and paying for glycol you do not need.
Check it with a refractometer rather than trusting the label on the tote, especially if the loop has been topped up with water over time. A loop that has been topped with water for two years is not at the concentration anybody thinks it is.
Why the reservoir tote is worth caring about
It feels like a storage question and it is actually a contamination question. The reservoir is plumbed into a closed loop that touches every jacket in your brewery. Whatever is in the reservoir circulates.
That is why we recommend a documented food-history unit for glycol even though glycol never touches beer. Not because of a regulation, but because the consequence of being wrong is a system flush rather than a discarded tote, and the price difference between a documented unit and an undocumented one is trivial against that.
Labelling, and the plate that prevents a disaster
The expensive failure in a small brewery is rotating a tote between duties. Caustic residue in a glycol loop attacks solder joints, aluminium components and gaskets, and the symptoms appear weeks later as unexplained leaks.
A marker pen washes off. A bolted steel plate does not. We fabricate these for a few dollars each and they are genuinely the best value item in a brewery's container programme. Label GLYCOL, CAUSTIC, ACID, GRAIN and WATER, and treat swapping as a prohibition rather than a preference.
The spent grain tote, which is the dangerous one
Spent grain and trub keep fermenting. They produce gas, and in warm weather they produce it faster than people expect. A sealed tote of spent grain over a hot weekend will deform, and occasionally it will do so dramatically.
Vented lid, always. Never a solid lid on anything organic. And do not fill above about 80 per cent, because the foam headspace is real.
The second issue is weight. Spent grain slurry is dense — comfortably above water — so a full 275 is well over 2,600 pounds and a 330 is over 3,100. If a farmer collects with a trailer and a tractor loader, check the loader rating before the first collection rather than after.
CIP chemistry and seat materials
- Caustic: EPDM seat, Grade C unit, vented or solid as you prefer.
- Phosphoric or nitric acid blend: EPDM is fine. Grade C.
- Peracetic acid: EPDM, and vent it — peracid degasses and a sealed tote will pressurise.
- Iodophor: EPDM, but expect permanent staining. Nobody minds.
- Chlorinated caustic: EPDM, and dedicate the unit permanently.
None of these need anything exotic, which is why Grade C is the right answer across the board. The full matrix is in chapter six of the size guide.
Buying as a small brewery
There is no minimum order here and small orders are completely normal — breweries are our fastest-growing sector and most of them buy two to eight units.
Two practical suggestions. If you are within driving distance of Indianapolis, yard pickup is dramatically cheaper than freight on a small order. And if you are not, ask the two or three other breweries in your city whether they need anything — three small orders become one partial truckload and the freight per unit drops by more than half. We will happily split the paperwork.
