What is the main difference between the head and the cap?

The head is an indispensable main pressure component in the pressure vessel, and the convex head of the rotation surface is used more. The types of convex head are hemispherical head, oval head, dished head, conical head and so on. The hemispherical head has good stress and is often used in high-pressure vessels, but it is difficult to manufacture, so the use of medium and low-pressure vessels is less.

Pipe caps are also called caps, plugs, caps, pipe caps, and bulkheads. A fitting for capping the end of a pipe. Its function is the same as that of pipe plug, but it is not necessary to cooperate with other pipe fittings and can be directly screwed on the end of the pipe. Used for threaded connection of welded steel pipes, plastic pipes, etc. Because the shape of the pipe cap and head is similar, the material is stainless steel, the pipe cap size is relatively small, can be forged; The head size is relatively large, generally pressed by steel plate, the pipe cap is generally used for the end of the pipe, and the head is used for the upper and lower (vertical equipment) parts or left and right ends (horizontal equipment) of container equipment.