Connection type between the jacket and the cylinder body

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The connection between the jacket and the cylinder is mostly achieved through welding of sealing elements, with the common structures for such elements being the co-axial variable-diameter structure and the ring plate structure. a. Coaxial tapered structure: When considering conical closures, when a ≤ 30° and the temperature of the jacket fluid fluctuates little with low pressure, a butt joint without flanges can be used, as shown in Figure 2(a). Since the fillet welds between the cylindrical closure element and the jacket suffer from poor stress conditions and it is difficult to ensure good welding quality, the welds must have a fully penetrated structure; the wall thickness is calculated based on the strength requirements of a conical head subjected to internal pressure without flanges. At 30°12 mm, a sealing element structure is used because it is difficult to flange the cylinder and the forming quality cannot be ensured. Image b. Ring plate structure: The ring-shaped plate closures have a simple structure and are easy to construct; since the ring plate bears the loads, it is generally quite thick. Ring plate seals can have their strength calculated in accordance with GB/T150.3-2011; the weld structure is designed appropriately, allowing them to be used in demanding operating conditions. Image