If your propane tank has been requalified, the requalification date will be printed on an oval sticker and affixed to the collar of the tank. If the date on the sticker does not have a letter to the right of it, your propane tank needs to be requalified within 12 years of the date on the sticker. If the date printed on the sticker has a letter "S" to the right of it, then your propane tank needs to be requalified within 7 years of the date printed on the sticker. If the date printed on the sticker has the letter "E" to the right of it, then your propane tank needs to be requalified within 5 years of the date printed on the sticker.
Do not use a propane tank that is 12 years older than its manufacture date if it has not been requalified until you have it inspected and requalified to ensure that it is safe to use.
It's important to know the age of your propane tank, because propane tanks must be requalified within 12 years of their manufacture date in order to be refilled. If you are not the original owner of the propane tank or can't remember when you bought it, do not worry. All propane tanks and cylinders are stamped with their manufacture date, you just need to know where to look for it and how to read it.
Locate the collar of your propane tank. The collar is the raised piece of metal at the top of the tank, surrounding the valve.
On the bottom half of the collar, look for the letters "MFG DATE." This indicates the manufacturing date.
Locate four numbers with a space between the second and third numbers directly beneath the letters "MFG DATE."
The first two numbers represent the month the propane tank was manufactured. The second two numbers represent the year the propane tank was manufactured in.
Subtract the year that the propane tank was manufactured from the current year to determine the age of your propane tank.
Based in Grand Rapids, Michigan, Elizabeth Grace is a freelance writer. She holds a Bachelor of Arts in public relations from Pepperdine University, and has 15 years of experience developing marketing campaigns for universities and multinational corporations.