Design Standards

Typical Cylinder Design

LPG household cylinders consist of two shells, each forming one half of the egg-shaped tank. The rim of the lower shell is drawn in ("joggled"), so that it fits inside the upper half and the upper half has a hole in the center of the dome to accomodate the valve neck or bung. The halfs are welded together and the bung is welded into the hole.

The bottom of this cylinder is further welded to a footring in order to make the cylinder stand on its own. The top is fitted with a shroud or collar, forming a handle for the cylinder and at the same time protecting the valve (screwed into the bung) from mechanical damage during handling of the tank. The neck ring is kept at the proper distance from the shell by stayplates. Neck- and footring are often sized in such a manner that the cylinders are stackable.

As the quality of the whole cylinder design and manufacturing is a safety issue, there are strict standards to adhere to (e.g. EN1442, BS5045, DOT4BA, ISO..etc).