Carbon steel butt welded head

Carbon steel butt welded head is an end cap on pressure vessels, which is a major pressure bearing component and plays a sealing role. Carbon steel butt welded heads are used to seal the upper and lower parts of pressure vessel bodies, 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. Carbon steel butt welded head is an excellent and important component of pressure vessel equipment in many industries such as petrochemicals, nuclear energy, water conservancy, food, machinery, diagnostic and treatment equipment, fertilizers, shipbuilding, etc. Carbon steel butt welded head is used in various container equipment, such as storage tanks, heat exchangers, towers, reactors, boilers, and separation equipment

Common materials for carbon steel butt welded heads: (20 #, A3, Q235, Q23 excellent, Q235B, 20G, Q245R, Q345, Q345R, 16Mn, ASTM A105, 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