A commercial gas cylinder is a pressure vessel used for storage and containment of gases at above atmospheric pressure. These cylinders are used in various industries, institutions, and hotels for cooking, electricity generation, transportation, and other purposes. Commercial gas cylinders are available in different sizes ranging from 8 kg to 33 kg. For commercial and industrial use, the cylinders typically have capacities ranging from 45 kg to 50 kg). Smaller cylinders with capacities ranging from 1 kg to 3 kg are used for camping equipment and in developing countries where they often serve as an entry level for LP Gas applications in low-income households mainly for cooking). The body of the LPG cylinder is deep drawn in two pieces and then welded together to make a compact unit without any leak and defect). The cylinders are spray-painted with a signal red color, and different companies have different colored rings around the bung to differentiate their products).