When a container is pressurized it is pressurized against the walls of the vessels. The pressure on the surface is always normal, regardless of size in High Pressure Gas Cylinders . There is a container that is a pressure different from atmospheric pressure. There are several types of them; Thin walls, thick walls, strong tanks, transportable containers, propane bottles and High Pressure Gas Cylinders . A container that holds liquid, vapor, or gas at different pressures and then atmospheric pressure at the same altitude. Generally, a thin-walled is considered if its radius is more than 5 times its wall thickness. Under this condition, the tension in the wall can be considered uniform. Thin walls are in fairly common use. They have two distinct types; cylindrical pressure vessels and spherical pressure vessels. Under this condition, the tension in the wall can be considered uniform. The stress in a vessel with thin walls varies from the minimum value on the outer surface of the vessel t