If you have any bulges or dents, this could compromise the tank as well. Where rust appears on a steel tank, that means the steel is starting to be compromised. You should routinely inspect your propane tanks for rust and corrosion. The requalification date will be stamped on the collar as well. After this time, you can have your tank inspected and requalified for another 5 years. The manufacture date is stamped on the collar in a month-year format. In the US, DOT propane tanks are considered qualified for 10-12 years from the date of manufacture.
Now will you ever use this information? Maybe not, but now you know why your propane filling attendant keeps throwing your tank on that scale! When should I replace my propane tanks?
The average DOT tank weighs about 17 pounds empty, so a 20-pound tank will weigh around 37 pounds when full.
When you add the TW to the weight of the propane, you have your full tank weight. On the neck of your DOT tank, there is a Tare Weight (TW). How do you know what your tank should weigh when filled?
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