What are the requirements for thick-walled pressure vessels?
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Thick pipes: Some requirements for thicker pipes are as follows: 01 For steel pipes with a wall thickness greater than 30 mm, it is not allowed to use hot rolling at a final rolling temperature that corresponds to the normalizing temperature as a substitute for normalizing treatment. 02 When the wall thickness of the take over is greater than 10 mm, steel pipes of grades 10, 20, and Q345D as specified in GB/T 8163 shall not be used. 03 For 10 and 20 grade steel pipes specified in GB 9948, with an outer diameter of not less than 70 mm and a wall thickness of not less than 6.5 mm, impact tests at -20°C and 0°C shall be conducted respectively. The average impact energy of the three longitudinal standard specimens shall be not less than (31 J–GB150) / (40 J–GB9948), and the minimum value for any one specimen shall be not less than 22 J (28 J). The impact energy requirements for smaller-sized specimens are in accordance with the provisions of 3.8.2.
When the wall thickness of the take over is greater than 10 mm, steel pipes specified in GB/T 8163 such as grades 10, 20, and Q345D cannot be used. What kind of pipes should be used then?
As shown in the figure, the usage regulations for 10, 20 steel and Q345D steel pipes specified in GB/T8163 are as follows: 1. They shall not be used as heat exchange tubes in shell-and-tube heat exchangers； ……