PRESSURE SAFETY

Hey, could you hold my beer?

Sure. But let’s check the pressure before we turn that knob. A good pour is worth a little care; getting hurt isn’t.

30 PSI is KegCalc’s calculation limit, not your equipment’s safety limit. Check the manufacturer’s working-pressure limit for every part exposed to pressure. The lowest applicable limit wins—even below 30 PSI. Unknown rating? Don’t pressurize until the manufacturer or a qualified draft-system technician confirms it.

Why we stop at 30 PSI

We chose 30 PSI to keep KegCalc focused on ordinary home CO₂ draft setups and to prevent unusually high calculated settings from being presented as instructions, including after an input mistake. It covers all 128 unchanged beer-style presets at sea level and at 5,000 feet, but some targets at higher elevations need more. We do not have usage data showing that it covers 99% of users. The cap reduces one risk; it does not make every setting below 30 PSI safe.

Find the weakest link

Your keg is only one part of the system. Check the regulator’s outlet limits, gas hose, manifolds and check valves, coupler or disconnects, keg and its lid/posts/seals, beer tubing, fittings and clamps, shank, and faucet. Identify every part in the pressurized path, including other branches sharing a regulator. Do not assume that beer line is protected by its flow resistance: pressure can remain when the faucet is closed. Cylinder pressure is a separate high-pressure side; a serving-pressure calculation says nothing about its safety.

Read the right number

Look for maximum working pressure or MAWP for the exact manufacturer, model, size and operating temperature. A gauge’s top number, regulator adjustment range, relief-valve setting, or a proof, test or burst pressure is not a substitute for a working-pressure rating. A pressure-relief valve is backup protection, not permission to exceed a rating. Never disable or bypass one.

A real tubing example

Accuflex’s published table for Bevlex 200-0307 tubing—3/16-inch inside diameter and 7/16-inch outside diameter—lists 80 PSI working pressure at 70°F, but only 26 PSI at 122°F. That is below our 30 PSI cap. It is a temperature-specific example, not a 26 PSI rating for every beer line. Warm equipment and cleaning conditions matter. Do not apply a rating from another size, material or temperature, or guess between published temperatures.

Different products, different limits

For reference: Accuflex Bevlex 200-0609 tubing (3/8-inch ID × 9/16-inch OD) lists 40 PSI working pressure at 70°F and 13 PSI at 122°F. Petainer’s 20 L Hybrid keg specifies dispensing pressure below 3.1 bar (listed as 45 PSI). KegLand’s premium 9.5 L stainless ball-lock keg lists 130 PSI working pressure. These are examples for those specific products and conditions—not permission to use those pressures, and not ratings for everything connected to them. Check your own exact equipment and all manufacturer conditions.

How to verify your setup

Read each component’s markings and manual, then find the manufacturer’s current data sheet for that exact part. Record the working-pressure limit, temperature range, approved gas or liquid use, connection requirements and source. Check the actual temperature of each part: a gas line outside the fridge may be warmer than the beer. If any rating is missing, conflicting or unclear, stop and ask the manufacturer or a qualified draft-system technician. A seller’s generic description or a familiar-looking fitting is not enough. Follow any lower operating restriction and required maintenance or replacement interval.

A rating assumes suitable equipment

A pressure rating is not a promise that an old or damaged part is safe. Before use, inspect equipment as its manufacturer directs for cracks, cuts, corrosion, bulging, brittle or discolored hose, damaged threads, worn seals, loose connections, and other signs of damage or degradation. Follow replacement and inspection intervals. A visual check cannot prove internal condition or pressure capability. If a part’s history or condition is uncertain, do not pressurize it; have it assessed or replaced with a compatible part.

What could go wrong?

CO₂ under pressure can be dangerous if mishandled. A damaged cylinder valve, incompatible connection or failed component can release gas suddenly; escaping gas, flying parts and pressurized liquid can cause serious injury, death or property damage. Secure cylinders and handle them as the supplier instructs. Follow manufacturer instructions for assembly, leak checks, isolation and pressure release before disconnecting or servicing anything. Never disable a relief device. KegCalc cannot inspect your equipment or prevent a regulator failure.

CO₂ does not give you a warning smell

Escaping CO₂ can accumulate in enclosed or low areas and cause rapid incapacitation or suffocation. Follow supplier instructions for ventilation and any required gas detection. If you suspect a dangerous accumulation, leave the area, keep others away and seek emergency help. Do not enter or attempt a rescue. Do not rely on smell to decide an area is safe.

Before you drill

Unplug the appliance and confirm the entire drilling path is clear of wiring and refrigerant lines using manufacturer information before making any hole—even a pilot hole. A door, lid or sidewall is not automatically clear. If you cannot confirm the path, do not drill; use a manufacturer-approved alternative or consult a qualified appliance technician. Hitting hidden services can cause injury, refrigerant release or property damage.

A calculator, not an equipment inspection

KegCalc estimates equilibrium carbonation pressure and approximate beer-line length for home systems using CO₂. Results depend on your inputs and simplified assumptions; line length does not predict flow rate. The carbonation correlation’s calibration range and uncertainty have not been independently established for this app. Beer-style targets are starting points, not your brewer’s specification. Nitrogen blends, long-draw systems and other specialized configurations require appropriate guidance. Manufacturer limits and instructions take precedence over KegCalc.

Keep the limits in perspective

KegCalc does not currently store or check your individual equipment ratings. You must verify them before using any result, including a manually entered pressure. A recommendation below 30 PSI is not a guarantee of safe operation or a particular pour. Nothing in this notice excludes rights or liabilities that applicable law does not allow to be excluded. If a setup needs more pressure than KegCalc supports, get qualified advice rather than treating the cap as the correct setting.

Sources & references

Examples reviewed September 25, 2026. Specifications may change. Safety notice version 1. Questions or a calculation issue?