Is Your Propane Grill Tank Cylinder Ready for the Next Fill?

Propane Grill Tank Cylinder with Marking to Show Expiration Date Ensuring it is Safe to Fill

Every portable propane grill tank cylinder has an expiration date of 12 years from original manufacturing date (by federal law). At the 12-year mark, cylinders must be tested and requalified, or disposed of. As we enter grilling season, many Blossman customers are asking how to know if their propane grill tank cylinders qualify for refilling. Per regulations by the Department of Transportation, there are clear markings to help people know if their cylinders are qualified, safe for residential and recreational use.

Cylinder Markings

Portable cylinders (such as those used for gas lanterns, recreational vehicles, barbecue grills and camp stoves) have several permanent markings on the cylinder body. As a heads-up, you will find several technical notations intended for the use of the manufacturer and propane provider such as “cylinder specification design code” and “cylinder tare weight.” For everyone else who just wants to grill a hamburger, it is only important to recognize the “test” or “requalification” date. 

What the cylinder markings mean

  • Here’s a key to understanding the original date or requalification markings on your cylinder:
    • A date without a letter indicates the next requalification must be within 12 years.
    • The letter “S” following the date indicates the cylinder must be requalified within seven years of the marked date.
    • The letter “E” following the date indicates that requalification is required again within five years of the marked date.
    • No date? A date past one of the guidelines above? Take this cylinder to your propane provider and get your cylinder recertified (if possible) or get a new one.

A few more cylinder safety items to keep in mind:

  • If your cylinder has been subjected to fire, please return to your propane provider immediately.
  • One thing to watch for if using tank exchange services, you might encounter a cylinder with XXXs over the DOT specification number or marked “CONDEMNED” on the shoulder, collar, or head. Do not use this tank! Instead, return this tank immediately to your propane provider for proper disposal.

Still not sure if your tank is ready to fill? Don’t worry – it’s what your local Blossman team is here for! Our trained propane experts know all of these cylinder safety guidelines, and a whole lot more about how to keep you and your family safe. Stop by your local store today with questions, or call 1-888-BLOSSMAN.