Elliptical head

Elliptical head, also known as elliptical head, is divided into EHA elliptical head and EHB elliptical head. The head is the end cap on a pressure vessel, which is a major pressure bearing component and plays a sealing role. The head of a pressure vessel is used to seal the upper and lower parts of the pressure vessel body, and when the pipeline reaches its end and no longer extends forward, a head is used to seal the pipe by welding. Products that have similar functions as head seals include blind plates and pipe caps. Blind plates and threaded pipe caps can be disassembled. After the head is welded, it cannot be disassembled again. The quality of the head is directly related to the long-term performance and good operation of the pressure vessel. According to different geometric shapes, heads can be divided into several types such as spherical, elliptical, disc-shaped, spherical crown shaped, conical shell, and flat cap. Among them, spherical, elliptical, disc-shaped, and spherical crown shaped heads are also collectively referred to as convex heads. In welding, it is divided into butt welding heads and socket welding heads

Elliptical heads are classified according to their manufacturing materials, including carbon steel, stainless steel, alloy steel, special alloy steel, duplex stainless steel, etc; Carbon steel: (20 #, A3, Q235, Q23 excellent, 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, 00Cr17Ni14Mo2, 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.); Dual phase stainless steel: (F51, S31803, S2205, F53, 2507, S32750, F55, 2607, S32760, etc.)

The commonly used names and type codes for heads are as follows:

1. Hemispherical heads: Type code: HHA;

2. Elliptical head: Type code: EHA, EHB

3. Dish shaped head: Type code: THA, THB

4. Spherical head: Type code: SDH

5. Flat bottomed head: Type code: FHA

6. Conical head: Type codes: CHA (30), CHA (45), CHA (60)

Common execution standards for heads: GB/T25198-2010 Pressure vessel heads

Head national standards, pipe fittings and pipeline standards: GB/T12459-2017, GB/T13401-2017

Head petrochemical standards: SH/T3408-2012, SH/T3409-1996

Elliptical heads are excellent and important components of pressure vessel equipment in many industries such as petrochemicals, nuclear energy, water conservancy, food, machinery, diagnostic and treatment equipment, fertilizers, shipbuilding, etc.

. Applied to various container equipment, such as storage tanks, heat exchangers, towers, reactors, boilers, and separation equipment