įibre composite cylinders were originally specified for a limited life span of 15, 20 or 30 years, while steel cylinders are nowadays typically withdrawn after 70 years, or may continue to be used indefinitely providing they pass periodic inspection and testing. When they were found to have inherent structural problems, certain steel and aluminium alloys have been withdrawn from service. Diving cylinders that are used in water must be inspected more often. The inspection interval of steel cylinders has increased from 5 or 6 years to 10 years.
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Ĭylinders reinforced or built-up with a fibre material usually must be inspected more frequently than metal cylinders, e.g., every 5 instead of 10 years, and must be inspected more thoroughly than metal cylinders. Due to the very high tensile strength of carbon fiber reinforced polymer, these vessels can be very light, but are more difficult to manufacture. Some newly developed lightweight gas cylinders are made from stainless steel and composite materials. Materialsįor a detailed discussion about the materials for gas cylinders, see Pressure vessel § Construction materials.ĭesign codes and application standards and the cost of materials dictated the choice of steel with no welds for most gas cylinders the steel is treated to resist corrosion. In contrast, what is called liquefied petroleum gas in the United States is known generically in the United Kingdom as "LPG" and it may be ordered by using one of several trade names, or specifically as butane or propane, depending on the required heat output. The United Kingdom and other parts of Europe more commonly refer to "bottled gas" when discussing any usage, whether industrial, medical, or liquefied petroleum.
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The term propane tank is also used for cylinders with propane.
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Packaged industrial gases are frequently called "cylinder gas", though "bottled gas" is sometimes used.
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"Bottled gas" is sometimes used in medical supply, especially for portable oxygen tanks. In the United States, "bottled gas" typically refers to liquefied petroleum gas.