Overview of the oval cylinder

The function of the cylinder is to provide the pressure space required for the process. It is one of the most important pressure components of the pressure vessel, and its inner diameter and volume often need to be determined by process calculation. Cylindrical cylinders (ie cylinders) and spherical cylinders are the most commonly used cylinder structures in engineering.

When the diameter of the cylinder is small (generally less than 500mm), the cylinder can be made of seamless steel pipe. At this time, there is no longitudinal weld on the cylinder; when the diameter is large, the steel plate can be rolled into a cylinder on the coiling machine or used in a hydraulic press. The upper half is pressed into two semi-cylinders, and the two are welded together by a weld to form a complete cylinder. Since the direction of the weld is parallel to the longitudinal direction (ie, the axial direction) of the cylinder, it is called a longitudinal weld, or simply a longitudinal weld. If the diameter of the container is not very large, there is generally only one longitudinal weld; as the diameter of the container increases, there may be two or more longitudinal welds due to the size of the steel sheet. In addition, the shorter length of the container can be directly connected to the ends of a cylinder to form a closed pressure space, thus forming a pressure vessel casing. However, when the container is long, due to the limitation of the size of the steel sheet, it is necessary to first weld the steel sheet into several cylinders (a certain cylinder is called a cylinder section), and then two or more cylinder sections. The assembly is welded to a cylinder of the desired length. The joint weld between the barrel section and the barrel section and between the barrel and the end head is called a circumferential weld, which is called a ring weld, because its direction is perpendicular to the axial direction of the cylinder.