What are the shapes of stainless steel caps?

　　Casing stainless steel caps, also known as cap, plug, cap, pipe cap, stuffy head, welded at the end of the pipe or fittings installed on the thread outside the end of the pipe to plug the pipe.

　　Stainless steel caps is used to close the pipeline and has the same function as pipe plugging. The form of blind plate is similar, but the blind plate can be disassembled and blocked, while the welded pipe stainless steel cap can not be disassembled. The ASTM 2 Inch Sch40 Stainless Steel Cap includes the design of convex cap, conical shell, variable diameter section, flat cover and contraction opening. The convex cap includes: hemispherical cap, elliptical cap, dish cap and spherical cap. From the point of view of force, the hemispherical cap is not good gradually in convex cap, but from the point of view of manufacturing difficulty, it is good gradually. The r part of the disc cap avoids splicing, which will reduce the thickness and increase the stress. When splicing, only radial and circumferential weld directions are allowed. This requirement may be cancelled in the future for large pipe stainless steel caps. The splicing distance should be more than 3 Delta and not less than 100 mm (HAZ is a high stress zone, and the chemical composition in this area will be burnt out). So avoid the high stress area, which is related to thickness. According to practical experience, the stress attenuation length is greater than 3 Delta and not less than 100 mm. But refrigeration equipment is difficult to meet this requirement, and has its particularity.