Gas Cylinder Sizes. Last Updated December 24, 2021 March 1, 2021 by John Ward. We're a group of welders dedicated to helping people enjoy welding and become better welders. We decided to set up this website to help you make better decisions about how to weld, what equipment to use, and to provide useful information about choosing a career.. Although it is considered to be a low-pressure gas, it has a fairly high-pressure rating of 250 psi (pounds per square inch). Its volatile nature required special gas cylinders for storage. Common sizes are: Common Acetylene Cylinder Name. Common Acetylene Cylinder Capacity.

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How long your welding gas cylinders will last depends on the gas flow rate. A cylinder with a capacity of 80cf will last about 4h if the flow rate is set at 20cfh. In comparison, a 125cf cylinder will last 12.5h if you use a flow rate of only 10cfh. Estimating how much gas you have left depends on the gas type but it's fairly easy to do.. Let's assume welding tank volume = 60cf. Flow rate = 20cfh. Then, gas welding time = 60/20 = 3 hours. This means if you're using a 60 cubic feet tank under a 20cfh flow rate, the gas will last for 3 hours. So, if your project would last much longer, it would be best to have a backup welding tank or get a bigger one.