ASTM A234 WPB Carbon Steel Pipe Caps
Carbon steel head (pipe cap), also known as plug, cap, pipe cover, blind head, is used to seal pipelines. Its function is the same as pipe plug, but the pipe cap can be directly screwed onto the pipe without the need for other fittings. The pipe cap includes the design of convex pipe cap, conical shell, variable diameter section, flat cover and tight mouth.
Convex pipe caps include hemispherical pipe caps, elliptical pipe caps, disc-shaped pipe caps, and spherical cap shaped pipe caps. From the perspective of force, the hemispherical cap in the convex cap is gradually becoming less desirable, but from the perspective of manufacturing difficulty, it is gradually becoming easier to manufacture.
The welding seam direction during splicing is only allowed to be radial and circumferential. In the future, this requirement may be cancelled for large pipe caps. The distance of splicing should be required to be greater than 3 δ and not less than 100mm (the welding heat affected zone is a high stress zone, and the chemical composition in this zone will be burned. Therefore, it is necessary to avoid high stress zones, which are related to thickness. According to practical experience, the stress attenuation length should be greater than 3 δ and not less than 100mm). But refrigeration equipment is difficult to meet this requirement and has its own particularities.
