How to design a vertical air storage tank
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Design a vertical air storage tank: :( :( :( Technical parameters: Design pressure: 5.0 MPa; Design temperature: 150°C; Container diameter: DN2000; Main material: 16MnR. There are two inlet/outlet pipes on the cylinder with a diameter of DN150. Manhole: DN450. There is one pipe each on the upper and lower end caps with a diameter of DN80. I would like to ask everyone the following questions: 1. Is it acceptable to use 16MnR as the main material? Are there any special requirements regarding the material, such as its condition at the time of supply? 2. Which is better for the pipes – steel tubes or forgings? Should the pipes be reinforced as a whole or using reinforcement rings? 3. Are there any special requirements during manufacturing, such as flaw detection, heat treatment, surface inspection, etc.? 4. Should the pipe flanges be long-neck butt-welded flanges?
It is acceptable to use 16MnR as the main material, while forged long-neck butt-welded flanges can be used for the connecting pipes
For this type of storage tank, one should consult manufacturers of pressure vessels; they have **industry-specific calculation software that can be used for such calculations. 16MnR will do. The reinforcement ring is determined through software calculations. Generally, if users want to save money, manufacturers will use reinforcement rings, which are much cheaper than full reinforcement. For flaw detection, 100% of the flanges need to be inspected; it is necessary to determine whether the standards set by the Ministry of Chemicals or the Ministry of Machinery should be applied, and this should be clarified with the manufacturer in advance. When designing, it is best to communicate with the manufacturer; this allows one to gain knowledge about actual tank design and also to become aware of certain precautions. . .
When the design pressure exceeds 4 MPa, integral reinforcement or forged thick-walled fittings should be used. Calculate whether the thickness determines a hot-rolled state or an normalized state. For 16MnR, heat treatment needs to be considered if the value exceeds 30; in addition, re-inspection for flaw detection is necessary when the value exceeds 38 (for details, refer to point 2 of Article 86 of the tolerance regulations)
When the thickness of the steel plate is greater than 34 MM, preheating to 100–150 degrees is required before welding. If the thickness is over 30 MM, stress-relief heat treatment is necessary after welding