Head

Head, also known as end cover, refers to the element used to close the end of the container and isolate the internal and external media. According to the shape of the head surface, it can be divided into convex, conical, flat and combined shapes. According to the different geometric shapes, it can be divided into spherical, elliptical, saucer shaped, spherical crown shaped, conical shell and flat cap, among which spherical, elliptical, saucer shaped and spherical crown shaped heads are collectively referred to as convex heads. Materials include carbon steel, stainless steel, alloy steel, aluminum, titanium, copper, nickel alloy, etc

The head is a component of the container, which is connected to the cylinder by welding. (As shown in the following figure) According to the different geometric shapes, it can be divided into spherical, elliptical, dish shaped, spherical crown shaped, conical shell and flat cap, among which spherical, elliptical, dish shaped and spherical crown shaped heads are collectively referred to as convex heads. In terms of welding, it is divided into butt welding head and socket welding head. It is used for various vessel equipment, such as storage tank, heat exchanger, tower, reactor, boiler and separation equipment. Materials include 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 alloys

To measure the outer circumference of the head, the cylinder shall be processed in advance. The outer circumference of the head shall be divided into four equal parts and marked on the cylinder and head for tack welding. The customer shall select the tack point according to the diameter and plate thickness for the tack welding. After the tack welding is completed, the welding shall be carried out

Pay attention to the protection of the surface of the stainless steel head. After the head and cylinder are assembled and welded, the weld seam, the heat affected zone and the surrounding welding slag splash pollutants shall be cleaned in time, and PT inspection and surface pickling shall be carried out to prevent the stainless steel head surface from being scratched, directly contacting with carbon steel, avoiding iron ion pollution, storing in the open air to prevent rain, and avoiding the design of the forced assembly and welding structure to prevent excessive restraint stress, The chloride ion content of water for hydrostatic test shall not be greater than 25mg/L, and it shall be dried in time after the test. Reducing acids such as hydrochloric acid shall not be used for stainless steel pickling