Tank recertification & expiry, explained
If a refill attendant refuses your tank, this is almost always why. This page explains the concept in plain language and points you to the safety authorities — it is not a substitute for their guidance or for a qualified propane professional.
The basic idea
Portable propane cylinders are certified for use for a limited period from manufacture, and they need periodic recertification after that. The dates are stamped on the tank's collar. A refill station must not refill a tank that is past its certification, and must never refill a tank that is damaged — dents, heavy rust, a faulty valve, or fire damage are all grounds for refusal.
What to do if your tank is expired
- Ask a propane professional — a refill station or propane dealer can tell you whether your tank can be recertified or should be retired. Recertification is a professional inspection process; it is not a DIY task.
- Or exchange it. This is the one case where an exchange cage is the smart move: swap the expired tank for a certified one (typically filled to 15 lb), then refill that tank going forward. See refill vs. exchange.
- Never refill a damaged or expired tank anyway, and never attempt to refill a non-refillable 1 lb cylinder — those are single-use by design.
Transport, in brief
Public safety material from the Propane Education & Research Council (PERC) and the National Propane Gas Association (NPGA) consistently advises: transport tanks upright and secured so they cannot tip or roll, keep the vehicle ventilated, and never leave a tank in a hot enclosed vehicle. For the full, authoritative guidance, read the sources rather than a summary:
Safety note: this guide is general information framed on PERC/NPGA public safety material. For anything specific to your tank — dates, damage, recertification — ask a qualified propane professional. When in doubt, do not fill it.