Recruitment of natural gas producers

A, pressure vessel classification method:

(1) Basic classification: The classification of pressure vessels should be based on the characteristics of the medium, and the classification diagram should be selected according to the following requirements, and then coordinate points should be marked according to the design pressure P (MPa) and volume V (L) to determine the classification of pressure vessels.

(2) Classification of multi-cavity pressure vessels: multi-cavity pressure vessels (such as tube side and shell side of heat exchangers, jacketed vessels, etc.). ) according to the classification of high pressure chamber, and managed according to this category. 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.

(3) Classification of multi-media pressure vessels in the same cavity: when there are multiple media in a pressure cavity, they should be classified according to the media with high group.

(4) Classification of pressure vessels with extremely small medium content: When the content of a harmful substance in the medium is extremely small, it should be classified according to the medium category determined by the pressure vessel design unit according to its harm degree and content.

(5) Classification of special circumstances.

Two. Classification of pressure grades: the design pressure (P) of pressure vessels is divided into four pressure grades: (1) low pressure (code L), 0.1MPa ≤ P <1.6mpa; (2) Medium pressure (code M),1.61MPa ≤ P <10.0mpa; (3) high pressure (code H),10.0 MPa ≤ P <100.0; (4) Ultra-high pressure (code U), p ≥ 100.0mpa.

Three. Classification of pressure vessels

Pressure vessels are divided into reaction pressure vessels, heat exchange pressure vessels, separation pressure vessels and storage pressure vessels according to the principle of action in the production process. The specific division is as follows: (1) reaction pressure vessel (code R) is mainly used to complete the physical and chemical reactions of media, such as various reactors, reaction kettles, polymerization kettles, synthesis towers, shift furnaces, gas generators, etc. ; (2) The heat exchange pressure vessel (code E) is mainly used to complete the heat exchange of media, such as various heat exchangers, coolers, condensers, evaporators, etc. (3) The separation pressure vessel (code S) is mainly used to balance and buffer the fluid pressure for the purification and separation of medium and gas, such as various separators, filters, oil collectors, absorption towers, copper washing towers, drying towers, stripping towers, sub-cylinders, deaerator, etc. (4) The storage pressure vessel (code C, in which the code B is spherical tank) is mainly used to store and hold gas, liquid, liquefied gas and other media, such as various types of storage tanks, buffer tanks, sterilizers, printing and dyeing machines, dryers, steamers, etc. In a pressure vessel, if there are more than two process action principles at the same time, the varieties should be divided according to the main role in the process.