Oval head is also called oval head, divided into EHA oval head, EHB oval head. The head is the final cover of the pressure vessel, which is an important pressure-bearing part and plays the sealing role. The head of the pressure vessel is to make the top and bottom bottom of the tank.
Oval head is also called oval head, divided into EHA oval head, EHB oval head. The head is the final cover of the pressure vessel, which is an important pressure-bearing part and plays the sealing role. The head of the pressure vessel is to make the top and bottom bottom of the pressure vessel tank, and the second is that the pipe is at the end and is not ready to extend forward, then use a head to seal the pipe at welding form. Products with head-like functions have blinds and caps, and the threaded blinds and caps are removable. After the head is soldered, it cannot be disassembled. The quality of the head is directly related to the long-term safe and reliable operation of the pressure vessel. According to the different geometric shapes, the head can be divided into spherical, oval, disc, spherical crown, cone shell and flat shell, among which the spherical, oval, disc and spherical crown head is also known collectively as convex head. In welding, it is divided into butt welding head and socket welding head.
Oval head is divided into carbon steel, stainless steel, alloy steel, special alloy steel, duplex stainless steel, etc. depending on the manufacturing material; Carbon steel: (20#, A3, Q235, Q235A, Q235B, 20G, Q245R, Q345, Q345R, 16Mn, ASTM A234WPB, ASTM A105, etc.); Stainless steel: (304, 304L, 316, 316L, S30408, S30403, S31608, S31603, SUS304, ASTM A403, TP321, TP317L, 347, 0Cr18Ni9, 00Cr19Ni10, , 1Cr18Ni9Ti, 06Cr17Ni12Mo2 , 022Cr17Ni12Mo2, etc.); Alloy steel: (16MnR, Cr5Mo, 12Cr1MoV, 10CrMo910, 15CrMo, 12Cr2Mo1, A335P22, St45.8/III., A10bB, etc.); Special alloy steel: (TP310S, 904L, Incoloy800, Incoloy825, Incoloy600, Incoloy625, etc.); Duplex stainless steel: (F51, S31803, S2205, F53, 2507, S32750, F55, 2607, S32760, etc.).
The commonly used type names and codes of the head are as follows:
1. Hemispherical head: type code: HHA;
2. Oval head: type code: EHA, EHB;
3. Disc head: type code: THA, THB;
4. Spherical crown head: type code: SDH;
5. Flat Bottom Head: Type Code: FHA;
6. Conical head: type code: CHA (30), CHA (45), CHA (60);
Common Executive Rule for Header: GB/T Pressure Vessel Header25198-2010
National header standard pipe standards: GB/T12459-2017, GB/T13401-2017
Petrochemical standards: SH/T3408-2012, SH/T3409-1996
Oval head is an indispensable and important part of pressure vessel equipment in many industries, such as petrochemical, nuclear, water conservancy, food, machinery, medical equipment, fertilizer, shipbuilding, etc. It is used in various vessel equipment such as storage tanks, heat exchangers, towers, reactors, boilers and separation equipment.
