When to Replace Propane Tanks
Everything you need to know about the lifespan, warning signs, and replacement timeline for propane tanks.
The Short Answer
Portable propane tanks (the 20-pound tanks used for gas grills) must be requalified or replaced 12 years from the manufacture date. The date is stamped on the tank collar. Many exchange services will not accept expired tanks. After requalification (which adds 5 years), the tank must be recertified again every 5 years.
Why Propane Tanks Need Replacing
Propane tanks are pressurized steel vessels that hold liquefied petroleum gas at approximately 120 to 200 PSI depending on temperature. Over time, the steel can corrode externally from weather exposure and internally from moisture in the propane. The valve assembly, safety relief valve, and O-rings degrade from thermal cycling and corrosion.
The 12-year rule comes from the DOT (Department of Transportation), which regulates portable propane cylinders. After 12 years, the tank must be visually inspected and requalified by a certified facility. The inspection checks for corrosion, dents, gouges, and valve condition. If the tank passes, it is stamped with a new qualification date and is good for 5 more years.
Most propane tank exchange programs (Blue Rhino, AmeriGas) will not accept tanks past their 12-year date. Refill stations at some hardware stores will also refuse to fill expired tanks. This is both a legal requirement and a safety measure.
Warning Signs It's Time to Replace
- The manufacture date stamped on the collar is more than 12 years ago
- Visible rust, deep pitting, or corrosion on the tank body
- Dents or gouges in the tank wall
- The valve is stiff, leaking, or damaged
- A propane smell near the tank when the valve is closed (leak)
- The tank exchange service refuses the tank
- The foot ring (base) is severely rusted or detached
How to Check the Age of Your Propane Tanks
Look at the tank collar (the raised ring around the valve at the top). You will see a date stamped in the format MM-YY (month and year). This is the manufacture date. The tank expires 12 years from this date. After requalification, a new date with an "E" prefix is added. Example: a tank stamped "06-14" was manufactured in June 2014 and expired in June 2026.
Replacement Recommendations
Tank exchange programs are the simplest option: bring your old tank, receive a filled one. When buying new, look for tanks with OPD (Overfill Protection Device) valves, which are required on all tanks manufactured since 2002. Store propane tanks outdoors in an upright position, never in a garage, basement, or enclosed space. Even a small propane leak in an enclosed space can create an explosion hazard.
The Bottom Line
Check the date stamp on your propane tank collar. Tanks expire 12 years from manufacture. After requalification, they are good for 5 more years. Exchange or replace expired tanks. Never store propane tanks indoors. At $30 to $60 for a new tank, replacement is straightforward and eliminates any safety concern.
Frequently Asked Questions
Yes. Certified propane dealers and some hardware stores can perform the visual inspection and requalification. The process involves checking the tank for corrosion, structural damage, and valve function. If it passes, the technician stamps a new qualification date on the collar. The cost is typically $10 to $30, which may not be worthwhile if the tank shows any signs of corrosion, since a new tank costs $30 to $60.
Do not put propane tanks in regular trash or recycling. Many propane exchange programs will accept expired tanks. Some municipal hazardous waste collection sites accept them. Scrap metal recyclers may accept empty tanks with the valve removed. Contact your local waste management authority for disposal options in your area.