How to Identify Welding Tanks

There are many welding processes, each using a different type of gas or mixture of gases. It can be difficult to identify the gas you have in the tank, but the easiest method to tell the contents of a welding tank is by cylinder color. When color alone is not enough, there are other reliable methods of identifying the content of the tanks.

The color of the tank with the markings will identify the type of gas inside.
  1. Identify the welding tank by the color of the gas tank. The most common colors in welding will be green for oxygen, maroon for argon, and red for acetylene and hydrogen. The Airgas website offers a more complete color chart. Do not rely on tank color alone, because many gas suppliers will repaint their gas cylinders a different color.

  2. Read the label near the head of the cylinder. The label is usually a sticker with a bar code. The label is placed by the gas company after filling the gas cylinder. This label will tell you the date and month of the fill date, chemical symbol of the gas inside and the name of the gas. This is the most reliable and secure method of identifying the gas tank.

  3. Read the manufacturing date of the tank. The date of manufacture is placed near the head of the cylinder and is written in month-year format, using one or two digits for month (M) and two digits for the year (YY). Look for a recertification stamp, usually marked with the month (M), location (L) and year (YY). If your welding tank is more than 10 years old and has does not have a recertification stamp, you must take it to a filling station to get it recertified. If it has a stamp but has not been recertified for five years, you must take it to get recertified.

About the Author

Louis Gutierrez began writing in 2010 for various websites, specializing in real estate, construction and electronics. He has over 10 years experience running and operating various successful businesses in these fields and holds a Bachelor of Arts in business administration, graduating magna cum laude from Florida International University.