Do propane tanks expire or need recertification?
Portable cylinders do; big home tanks don't. A refillable 20 lb cylinder must be recertified 12 years after its manufacture date, then every 5 years after that — the dates are stamped on the collar. Large stationary and buried ASME tanks are built to a different standard and never 'expire' or need recertification, just periodic inspection.
Portable cylinders: 12 years, then every 5
The stamped manufacture date (month and year) on the collar starts the clock. At 12 years a cylinder needs recertification; after that it's good for another 5 years at a time. A refill station or propane dealer won't fill an out-of-date cylinder until it passes inspection. This is one more reason keeping your own tank and refilling beats the exchange cage — you can actually track the date instead of inheriting a stranger's.
Big tanks are a different animal
The 250- and 500-gallon tanks feeding home fireplaces out in Fairview, Candler, and the cabins are ASME tanks — no expiration, no recertification cycle. They get periodic visual inspection and their valves and regulators are checked over time, but there's no 12-year clock, and a buried tank is the same. One exception worth knowing: a 100 lb cylinder, big as it is, is still a portable DOT cylinder, so it follows the same 12-year-then-every-5 rule as a 20-pounder. It's all a real argument for a permanent tank over juggling cylinders for a fireplace or a frequently used fire pit.
When in doubt, ask before you fill
An old, rusty, or out-of-date cylinder isn't worth the risk. If you're setting up a propane fireplace or gas fire pit, we'll help you get the tank side right with your supplier and handle the licensed gas connection ourselves. Call (828) 545-0525.
Related questions
- Does propane go bad if it sits unused for a long time?
- Is it better to refill or exchange 20 lb propane tanks for a fire pit?
- Is it safe to store spare propane cylinders in my garage?
- How do I check how much propane is left in my tank?
- Does it matter whether I lease or own my propane tank when adding a fireplace?
- How do I know if my house has natural gas or propane?
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