Sealing head

Sealing head, used for plugging pipelines or pressure vessels.

Sealing head refers to the element used to close the end of the container to isolate the internal and external media, also known as end caps. The head of a cylindrical container is generally a rotating shell. According to the shape of the head surface, it can be divided into convex shape, cone shape, flat shape and combined shape. Convex heads refer to heads whose outer surface is convex, such as hemispherical, elliptical, dish-shaped and spherical heads without folding edges. Some gas cylinders use a combined bottom head with a convex surface inward, which can not only ensure the strength, but also meet the needs of safe use.

The head is a part of the container, which is connected to the cylinder by welding. In welding, it is divided into butt welding head and socket welding head. Used in various container equipment, such as storage tanks, heat exchangers, towers, reactors, boilers and separation equipment, etc. The materials are 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 etc.

The head is an indispensable and important part of pressure vessel equipment in many industries such as petrochemical, atomic energy and food and pharmacy. The head is the end cap on the pressure vessel and is a main pressure-bearing part of the pressure vessel. The role played is the sealing effect. One is to make the upper and lower bottoms of the tank-shaped pressure vessel, and the other is that the pipe is at the end and is not going to extend forward. Then a head is used to seal the pipe in the form of welding. Among the pipe fittings, there are blind plates and pipe caps that have similar functions to the head, but those two products can be disassembled. After the head is welded, it cannot be disassembled. The matching pipe fittings include pressure vessels, pipes, flanges, elbows, tees, crosses and other products.

What are the common forms of horizontal oil tank heads? When manufacturing gas station oil tank heads, it is necessary to effectively ensure that the geometric dimensions of the stamped and formed heads fully meet the technical requirements of the drawings, except for the unfolding and blanking dimensions of the heads In addition to accurate calculations, the quality of the entire manufacturing process must be strictly controlled. Our professional R&D technicians summarized in detail the key points of the core manufacturing link of the gas station oil tank head. The long axis of the standard elliptical head: the short axis=2:1. The reason why it is more commonly used is that it has absorbed the advantages of the hemispherical head with good force and the shallow depth of the dish-shaped head. Since the curvature of the warp of the ellipse is smooth and continuous, the sealing The stress distribution in the head is relatively uniform. The depth h of an elliptical head depends on the ratio of the long and short axis of the ellipse, that is, the ratio of the inner diameter Di of the head to the double depth of the head (Di/2h). The smaller the ratio, the greater the depth of the head , The force is uniform and the wall is thin, but processing and manufacturing is difficult; the larger the ratio, the smaller the depth of the head, which is easier to process and manufacture, but the stress state is poor and the wall thickness increases.

Therefore, oval heads are used without special requirements. The hemispherical head with a smaller diameter can be integrally pressed into shape, but the larger diameter is difficult to press because of its greater penetration. Compared with other types of heads, under the conditions of the same diameter and pressure, the required thickness is smaller. When the head volume is the same, the surface area is smaller and the materials used are less. The force is very uniform. However, due to the complicated manufacturing process, it is generally used for pressure vessels with higher pressure and larger diameter.

The model of our company's head products is Φ32mm-Φ3420mm.