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In order to deeply explore the updated content of the "Pressure Vessel" (GB/T 150.1~150.4-2024) standard, the equipment professional team of our company, Hebei Huafei Engineering Design Co., Ltd. Luoyang Branch (hereinafter referred to as "Huafei Engineering Luoyang Branch"), carefully organized a special seminar. The key points of the meeting are as follows:

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1. Article 3.1.8 of GB/T 150.1-2024 proposes "maximum design temperature" and "minimum design temperature" and cancels "minimum design metal temperature". The maximum design temperature and minimum design temperature are specified when the working temperature is above 0℃ and below 0℃.

2. "Maximum allowable accumulation pressure" replaces the "overpressure limit" of the 2011 version. Overpressure relief devices must be installed in internationally renowned specifications such as ASME and EN13445. According to the requirements for the location of safety devices for the installation of overpressure relief devices in Appendix B.9 of GB/T 150.1-2024, the maximum relief pressure (absolute pressure), maximum allowable accumulation pressure, safe relief volume and other specific contents are specified.

3. According to the different types of safety valves, the applicable occasions of safety valves are discussed: for example, ordinary safety valves are usually used in occasions where the additional back pressure is constant or the discharge back pressure is not greater than 10% of the set pressure; when the discharge back pressure is greater than 10% of the set pressure or the relative additional back pressure changes greatly, and the total back pressure does not exceed 50% of the set pressure, a balanced safety valve is usually selected; pilot safety valves are usually used in occasions where the back pressure is large (greater than 30% of the set pressure) or the difference between the working pressure of the container and the set pressure of the safety valve is small [usually refers to the difference between the two is less than 7% of the design pressure (working pressure greater than or equal to 0.5MPa) or the difference between the two is less than 0.05MPa (working pressure less than 0.5MPa)]; when the medium or environment has an impact on the performance of the spring, a balanced safety valve should be selected.

4. The relevant technical requirements and usage regulations for updating pressure vessel materials are clarified. For example, the impact performance indicators of non-alloy steel and alloy steel include the newly added lower limit of steel standard tensile strength>690MPa, impact absorption energy of 3 standard specimens, and average side expansion value (LE) of 3 standard specimens. The side expansion value refers to the lateral expansion increment on both sides of the back of the notch of the impact specimen due to hammering in the impact test. It is an indicator of material toughness and is usually obtained by measuring the surface area of the side expansion of the specimen. Austenitic-ferritic stainless steel plates, forgings and steel pipes should be measured in phase proportion according to the provisions of GB/T13005. The metallographic structure should be austenitic-ferrite, and the austenite content should be between 40% and 60% (ferrite should be between 60% and 40%). The ferrite or austenite content of austenitic-ferritic stainless steel welded joints should be in the range of 35% to 65%. The minimum temperature of austenitic stainless steel is reduced from -253℃ in the 2011 version (the boiling point of liquid hydrogen is -252.8℃) to -269℃ (the boiling point of liquid helium is -268.8℃). The minimum temperature in GB/T150.2-2024 is -269℃, which is the minimum applicable temperature for aluminum and aluminum alloys.

5. The main failure modes in common containers are sorted out: short-term failure modes (brittle fracture, ductile fracture, excessive deformation and buckling), long-term failure modes (creep rupture, creep excessive deformation, creep instability, corrosion and wear and environmentally promoted fracture) and cyclic failure modes (ratchet or incremental plastic deformation, alternating plasticity, fatigue and corrosion fatigue).

6. The background of the newly promulgated national standard GB/T 42594-2023 "Guidelines for Classification of Media Hazards in Pressure Equipment" and the main classification methods such as media toxicity and explosiveness were further compared. The changes in the current TSG 21-2016 media grouping according to GB/T 42594-2023 were further compared, and the rationality of the new standard for the classification of media hazards in pressure equipment was analyzed.

7. When the elliptical head is likely to buckle under internal pressure, it can be designed according to one of the analytical methods or empirical methods; when the dished head is likely to buckle under internal pressure, it can be designed according to one of the analytical methods or empirical methods.

8. Update the text descriptions of each chapter and the relevant contents in the charts according to the standard errata.

Through this exchange and discussion, it will help to improve the company's overall professional and technical level, improve the company's relevant regulations and requirements, continuously enhance the professional skills of employees, and contribute solid strength to the company's high-quality development.