What is the pressure range of the pressure vessel?

The design pressure (P) of the pressure vessel is divided into four pressure levels: low pressure, medium pressure, high pressure and ultra-high pressure. The four pressure ranges are as follows:

1, low pressure (code L) 0. 1 MPa ≤ P

2. Medium voltage (code M) 1.6 MPa ≤ P

3. High pressure (code H)10.0 MPa ≤ P.

4. Ultra-high pressure (code U) p ≥100.0mpa.

Extended data:

manufacturing process

1, pressure vessel manufacturing process can be generally divided into: raw material acceptance process, marking process, cutting process, rust removal process, mechanical processing (including trimming, etc. ) process, rolling process, assembly process, welding process (product welding test plate), nondestructive testing process, hole marking process, general inspection process, heat treatment process, pressure test process and anti-corrosion process.

2. Different welding methods have different welding processes. The welding process is mainly determined according to the material, brand, chemical composition, structural type and welding performance requirements of the welded parts. First of all, the welding methods should be determined, such as manual arc welding, submerged arc welding, argon tungsten arc welding and gas shielded welding. There are many welding methods, which can only be selected according to the specific situation.

After the welding method is determined, the welding process parameters are determined. The types of welding process parameters are different. For example, manual arc welding mainly includes: covered electrode model (or brand), diameter, current, voltage, welding power supply type, polarity connection, number of welding layers, number of welding passes, inspection method, etc.

There are many classification methods for pressure vessels. From the perspective of use, manufacture and supervision, there are the following.

(1) is divided into low-pressure vessels, medium-pressure vessels, high-pressure vessels and ultrahigh-pressure vessels according to the pressure grade.

(2) According to the medium, it is classified as non-combustible and non-toxic; Flammable or toxic; Highly toxic.

(3) According to the different functions in the process, it can be divided into:

① Reaction vessel: a vessel used to complete the physical and chemical reactions of the medium.

② Heat exchange container: a container used for heat exchange of medium.

③ Separation vessel: a vessel used for mass exchange of medium, gas purification and solid, liquid and gas separation.

④ Storage and transportation container: a container for holding liquid or gas materials, storage and transportation media or balancing and buffering pressure.

Multi-cavity pressure vessels (such as tube side and shell side of heat exchanger, jacketed vessels, etc.). ) classify according to the pressure chamber with high classification and manage according to the classification. However, the technical requirements for design and manufacture should be put forward according to the respective categories of each pressure chamber. When classifying each pressure chamber, the design pressure is the design pressure of the pressure chamber and the volume is the geometric volume of the pressure chamber.

1, classification of multimedia containers in the same room

When there are many kinds of media in a pressure chamber, they are classified according to high grouping media.

2. Classification of containers with minimum medium content

When the content of a harmful substance in the medium is extremely small, the medium group should be determined by the pressure vessel design unit according to its harm degree and content.

References:

Baidu encyclopedia-pressure vessel