A conical head is a closure with a conical surface on the shell. Its features include uniform velocity change of the medium as it passes through, facilitating the emptying of thick liquids and materials containing solid particles. However, it has poor mechanical properties, and the discontinuous stress at the junction with a cylinder or pipe due to the shape change is significant. To reduce the discontinuous stress, a flanged structure with a curved transition or locally thickened structure can be used at either the large or small end of the conical shell. According to the Chinese pressure vessel design specifications, when the semi-锥 angle is greater than 30°, the large end of the conical shell should be a flanged structure; when the semi-锥 angle is greater than 45°, the small end should be a flanged structure. Due to the thicker wall thickness of the conical head, manufacturing is not convenient, and it is only used when necessary for the process.