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October 2002 — Protect Cylinders from Extreme Temperatures Most people know that compressed gas cylinder pressure increases with an increase in temperature. Therefore, cylinders should not be exposed to excessive heat. For most gases, 125°F is the maximum. With winter approaching, gas users should be aware that extreme cold may also affect cylinders and the gases within them. Unless made specifically for low-temperature use to retain their ductility, cylinders should not be subjected to temperatures less than -20°F. However, even temperatures not nearly that cold can lead to problems. Cylinders should not be stored where ice or snow can accumulate. Valve protection caps can freeze tight and, more importantly, critical pressure relief devices can be affected. Cylinders subjected to these conditions should be allowed to thaw before use but never use a flame, steam or localized heat source. To ensure that gas mixtures remain homogeneous while cylinders are in storage, cylinders should be stored at about 70°F. Gases can liquefy below their condensation temperature and mixtures can separate. This is commonly called, "falling out of the mix." The gas is still present within the cylinder, but the mixture is no longer homogeneous. Gas mixtures exposed to temperatures below the condensation point of their components can be remixed by allowing the cylinder to warm to room temperature and lying the cylinder flat for at least 24 hours or by immersing the bottom 1/3 of the cylinder in a warm water bath for at least six hours (be careful to not allow the temperature to exceed 125°F). Different gases have different properties and do not all behave the same way. Always read and understand precautionary information and manufacturer's recommendations regarding the gases you use. Your manufacturer's operating manual is the best source of detailed information for safe usage and for ensuring a long service life of your pressure regulator.
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