Dished only Head is a component used to close the end of the container , so as to realize the isolation of the internal container from the external medium, it also called end cap. The head of a cylindrical container is usually a truncated shell. It can be divided into convex, conical, flat and combined shapes according to its surface shape. The so-called convex head refers to the head, whose surface shape is convex, such as hemispherical, elliptic, saucer-shaped and uncrimped spherical head.
For example, in practical application, we can see that some cylinders adopt a convex inward composite bottom head, which can not only meet the strength requirements, but also guarantee the safe use. This product is mainly used for various container equipment, such as storage tank, heat ex-changer, tower, reaction kettle, boiler and separation equipment. They are made of carbon steel (A3, 20#, Q235, Q345B, 16Mn, etc.), stainless steel (304, 321, 304L, 316, 316L, etc.), alloy steel (15Mo3 15CrMoV 35CrMoV 45CrMo), aluminum, titanium, copper, nickel and nickel alloy.
Combined with the current application, the head has become an indispensable and important component, it is in the pressure vessel equipment of petrochemical, atomic energy and food and pharmaceutical industries. As the end cover on the pressure vessel, this element is a main pressure bearing part of the pressure vessel, which plays a role of sealing. Therefore, it is an important component for practical production.
So what is the actual application? Typically, one is to use the head product as the top and bottom of the tank pressure vessel, and the other is to use a head to seal the pipe in the form of welding ,when the pipe ends and is not ready to extend further.
There are some products are close to the function of the head, such as the blind plate and the pipe cap, but the two products can be disassembled. After the sealing head is welded, it can not be disassembled. The supporting pipe fittings include pressure vessel, pipe, flange, elbow, tee and other products. The quality of head is directly related to the long-term safe, and reliable operation of pressure vessel.