Home brewing safety with CO2 cylinders glass and hot wort

Hot wort and scalds

Twenty litres of wort weighs about 21 kg. Carrying it boiling hot across a kitchen is the most dangerous thing most homebrewers do. Burns from hot sugary liquid can be worse than from water, because the wort sticks to skin.

• Fit a tap or valve to your kettle and drain it rather than lifting it.
• If you must move a full pot, wait until it is cool or get help.
• Wear closed shoes. Sandals and spilled wort do not mix.
• Keep children and pets out of the brewing area on brew day.
• Watch for boil-overs in the first minutes of the boil, especially when you add hops.

Gas burners and ventilation

Many Indian homebrewers boil on an LPG burner. These produce carbon monoxide if combustion is poor and they consume oxygen in a closed space. Brew outdoors, on a balcony or in a room with a window open and a fan running. Never run a high-output burner in a small closed kitchen.

Check hoses and regulator joints for leaks with soapy water. Replace cracked hoses. Turn the cylinder valve off when you finish, not just the burner knob.

CO2 cylinders

Once you start kegging, you have a high-pressure gas cylinder at home. Our guide to kegging homebrew covers the set-up. The safety rules are simple:

• Keep it upright and secured. Chain or strap it to a wall or a sturdy frame. A cylinder that falls and snaps its valve becomes a projectile.
• Always use a regulator. Never connect a cylinder directly to a keg. Cylinder pressure is many times what a keg can take.
• Buy and refill from a licensed supplier. Gas cylinders in India are regulated and must be periodically tested. Rules change, so ask your supplier to confirm the test date on the cylinder.
• Keep it out of the sun and away from heat. Pressure rises with temperature.
• Check for leaks at every joint with soapy water whenever you change a fitting.

CO2 in enclosed spaces

Carbon dioxide is heavier than air, has no smell at the levels that matter and displaces oxygen. A leak inside a closed kegerator, a small store room or a cellar can build up a dangerous concentration. Symptoms start with headache and breathlessness and can progress to collapse.

Keep the cylinder outside the fridge where possible, with only the gas line passing in. Ventilate small spaces. If you open a kegerator and feel a sudden headache or shortness of breath, step away into fresh air. Fermenting beer gives off CO2 too, so a closed cupboard full of active fermenters deserves the same respect. Our article on CO2 in the brewery covers the commercial side.

Bottle bombs

Overcarbonated bottles can burst. The usual causes are bottling before fermentation has finished, using too much priming sugar or a wild yeast or bacterial infection that keeps eating sugar after bottling.

• Confirm gravity is stable over two or three days before bottling.
• Weigh priming sugar. Do not guess.
• Store conditioning bottles in a closed box or crate, never on an open shelf at head height.
• If one bottle gushes or bursts, chill the rest at once to slow the yeast, then open them one at a time wearing safety glasses and pointing them away from faces.

Glass carboys

Glass carboys are lovely to look at and dangerous when wet. A full one weighs over 25 kg and is slippery. A dropped carboy breaks into large, sharp pieces. Carry them in a crate or a purpose-made harness, never by the neck. Never put hot liquid into a cold one. Many brewers now prefer PET or stainless for exactly this reason.

Chemicals and electrics

Caustic cleaners and acid sanitisers deserve gloves and eye protection, especially when mixing concentrate. Add chemical to water, not water to chemical. Label every spray bottle.

Store chemicals in their original labelled containers, high up and away from food, children and your brewing ingredients. Never decant caustic into a drinks bottle, even for a day.

Electric kettles, heating elements and pumps sit close to water and wort. Use a socket with earth leakage protection (an RCD or ELCB), keep cables off the floor and never handle plugs with wet hands. Most homebrew injuries are avoidable with habits like these. A short, structured safety course is the easiest way to build them before something goes wrong.

Common questions

Is it safe to keep a CO2 cylinder at home?

Yes, if it is upright, secured to a wall, fitted with a regulator, kept out of the sun and checked for leaks. Buy it from a licensed supplier.

How do I know if my bottles might explode?

Gushing on opening, very firm plastic test bottles or a gravity that was still falling at bottling are warning signs. Chill the batch and open bottles carefully with eye protection.

Can I boil wort indoors on a gas burner?

Only with good ventilation. LPG burners consume oxygen and can produce carbon monoxide, so open windows, run a fan or brew outdoors.