When recertifying Acetylene cylinders we inspect the shell and porous mass. Cylinders that pass inspection receive a stamp qualifying them for another 10 years of service.
Unlike most industrial gases, Acetylene is dissolved into a solvent to increase safety and improve stability. When mixed with oxygen it has a burning temperature up to 3,148℃. Acetylene cylinders have a steel shell, the interior is constructed of a fire resistant monolithic filler referred to as the porous mass. The porous mass is saturated with acetone or dimethyl formamide.
Acetylene cylinders should be stored in a upright position. The temperature should never exceed 52℃. In the winter the pressure can drop to nearly zero. When flowed at low temperatures acetone may leak from the cylinder resulting in clogging of downstream equipment.
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