HG/T 20703.5-2000 Requirements for the content depth and format of the provisions for the selection of engineering materials HG/T20703.5-2000 standard download decompression password: www.bzxz.net

Requirements for the content, depth and format of the engineering material selection regulations HG/T20703.5-2000
Subject content and scope of application
This standard specifies the content, depth and file format of the engineering material selection regulations (also known as material memorandum), which is applicable to design quality management. wwW.bzxz.Net
2 Contents of engineering material selection regulations
The engineering material selection regulations are an important document compiled by the material profession. It mainly explains the selection principles and regulations for process equipment and pipeline materials in the design of an engineering project, and is also the basis for the selection of equipment and pipeline materials by relevant professionals. The content of the engineering material selection regulations should include the following aspects: According to the category of process equipment, list the main materials of each equipment. 2.0.1
List the materials of each pipeline or each type of pipeline according to the classification number of the process pipeline. If necessary, various 2.0.2
symbol lines can be used to directly indicate the materials of the process on the process flow chart, that is, in the form of a "pipeline material identification diagram". 2.0.3
Specify the general requirements of materials:
Corrosion allowance;
Welding and lining materials;
Material requirements for machines, pumps, etc.;
Materials for instruments;
Materials for internal parts;
Specify the test methods, welding or construction requirements, etc. for materials with special requirements and the engineering standards, regulations and instructions to be followed.
7Specify the international and domestic standards and specifications for the materials. 2.0.4For steel structures such as smoke windows, platforms, ladders, and floor slabs, there are generally no special requirements except for those used in low-temperature occasions. However, the title should be indicated in the engineering material selection regulations and the words "no special requirements" should be written. 253
3 Depth of engineering material selection regulations
The content of the engineering material selection regulations is mainly to explain the selection principles and regulations for relevant equipment materials. Therefore, its depth will be related to the material. The preparation of the engineering material selection regulations should be based on meeting the requirements of specific process production. Its depth has the following requirements:
The materials listed in the engineering material selection regulations should meet the requirements of process production, especially the special process production requirements, such as corrosion resistance and low temperature resistance. The specified materials should be mature, with good processing technology and welding performance, and easy to manufacture. 3.0.2
The selection of the specified materials under specific process production conditions should be reasonable, economical and easy to purchase. Under certain process conditions, when there is no suitable material, it is allowed to use a certain material that has been used in production. However, as a material professional, attention should be paid to the trend of new materials that have been developed and produced at home and abroad, or cooperate with scientific research departments to improve this material, conduct further analysis and supplementary tests, and try to apply new materials to future projects to meet the requirements of Articles 3.0.1 and 3.0.2.
Format of Engineering Material Selection Regulations
The format of Engineering Material Selection Regulations is as follows: Regulations for Engineering Material Selection of ××× Installations
4.1 General
4.1.1 Scope
It shall be stated which equipment and pipelines the provisions of the Engineering Material Selection Regulations apply to. 4.1.2 Substitute Materials
The provisions for substitute materials shall be stated.
4.1.3 Abbreviations
4.2 General Materials for Process Equipment (including Main Pipeline Materials)4.2.1 Material Standards and Corrosion Allowances
The material standards and corrosion allowances generally selected for process equipment in the project shall be stated. 254
4.2.2 Overlay and Lining
The provisions and requirements for overlay and lining structural materials shall be stated. 4.2.3 Austenitic Stainless Steel
The material and model of austenitic stainless steel, the requirements for the relevant materials selected, and the numbers of other engineering standards, regulations and instructions shall be stated.
4.2.4. Provisions for other materials
The types and grades of non-metallic materials used, relevant material requirements and other engineering standards, regulations and instruction manual numbers should be stated. At the same time, occasions that may not be applicable should be stated. 4.2.5 Various media
It should be stated which materials are not applicable in specific media. 4.2.6 Materials for equipment and pipelines in contact with cooling water The materials used for equipment and pipelines in the case of different types of cooling water should be stated. For example, if seawater is used as cooling water, the materials of equipment, pipelines and valves in contact with seawater should be specified. For some materials, their corrosion margins should also be specified.
Process equipment materials
The main materials used for each process equipment should be listed separately. Such as 4.3.1 "B\ type equipment
B1070 Vent smoke window: 304L
"c" type heat exchanger
C1021 High-pressure heat exchanger
Shell side: carbon steel
Tube side lining: 316Lmod (engineering standard number adopted) Heat exchange tube: X2CrNiMo25-22-2 (engineering standard number adopted) Expansion joint: 304L
C1032 Low-pressure ammonium carbamate condenser
Shell side: 304L (including heat exchange tube, tube sheet) Tube side: carbon steel
Tube mouth a+gas distributor: 316L
4.3.3 "D type reactor
D1021 Urea synthesis tower
Lining and internal parts: 316Lmod (engineering standard number adopted) Shell and head: carbon steel
"E\ type tower
E1031 distillation tower
shell, head and internal parts: 316L
Padding, ball ring: 316L
Steam coil: carbon steel
"F\ type tank
C02 separation tank
shell, head: carbon steel + epoxy resin coating"H\ type steel structure: no special Requirements
"Type of machines and pumps
J1011 Process air blower
Casing: carbon steel
Impeller: carbon steel
Shaft: carbon steel
2J1032 Urea solution pump
Casing: 304L
Impeller: 304L
Shaft: 304L
3J1091 Steam condensate pump
Casing: Carbon steel
Impeller: Carbon steel
4.3.8 "L\" special equipment
L1061 granulation equipment: Carbon steel
Frame: Carbon steel
Granulation nozzle: 304L
4.3.9 "M" type piping materials
The pipes connected to the equipment are made of the same material as the equipment. Use the pipe material identification diagram to illustrate the materials used for process pipes. 2
Appendix Pipe material identification diagram example
NHs first 104-c
CO2 from 1102-C
903-J/3
Urea synthesis high pressure ring pipe material identification diagram example 1301-J/JA
Go to 1201-E
Go to 1301-C||tt ||From 1905-J/JA
1904-J/JA
1301-ECB
1301-ECB
1201-c
to 1301-8
1201-D
1202-C
1203-C
120 1-FA/FB||tt| |1902-C
1903-J/34
1904-J/IA
Material Legend
Urea Synthesis Tower
High Pressure Ejector
High Pressure Heat Exchanger
High Pressure Condenser
High Pressure Washer
Circulating Cooler
High Pressure Washer Circulating Attenuation
Urea Grade
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