Important position of stainless steel cap

　　The opposite radial displacement occurs at the connecting part, which strengthens and counteracts most of the radial displacement, so that the circumferential compressive stress of the cylinder reduces the circumferential tensile stress of the stainless steel caps.

　　When the elliptical stainless steel caps and the cylinder are connected, the bending radius of the elliptical stainless steel caps is continuous and does not produce stress, so it can be used in the container of higher pressure, while the disc. The connection of shaped ASTM A312 TP304L stainless steel pipe fittings cap is discontinuous and the productivity stress is generally applied in low pressure vessel, especially for stamping and butterfly stainless steel caps.

　　The structural discontinuity zone of pressure vessel is usually the high stress zone of pressure vessel. Generally speaking, the structural discontinuity zone of pressure vessel can be divided into two types: the general structural discontinuity zone and the local structural discontinuity zone.

　　Overall structural discontinuity refers to the stress or strain sources that affect a considerable part of the structure, such as the joint area between stainless steel caps and shell, flange and shell, nozzle area, joint area of different diameters or thicknesses or materials, etc. Local structural discontinuity refers to the stress that affects a relatively small area of the structure. Or strain sources, such as small fillet radius, small connectors, partially penetrated welds or holes, etc. Many structures, such as pressure vessel nozzles with openings, have both overall structural discontinuity and local structural discontinuity. Because the geometric structure of discontinuous zone is usually complex, it is difficult to solve it accurately by analytic method, and the finite element method is usually used to calculate it.