What is the design temperature for styrene storage tanks?
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When selecting materials for styrene storage tanks, it is necessary to determine the design temperature. Could setting this design temperature too high affect the calculation of the allowable stress of the materials?
According to SH3007 \"Code for Design of Tank Areas in Petrochemical Storage and Transportation Systems\", the storage temperature for styrene storage tanks is 5–20°C.
Thank you, I understand this storage temperature. But how is the design temperature of the material determined? Is it reasonable to use 45°C as the design temperature? Please help answer the following~
This post was last edited by Zhizhi Ming on 2021-3-16 at 21:34. Stainless steel is generally used for styrene storage tanks; carbon steel Q235A is also used in some cases. The design temperature of the material is determined based on its type, and 45°C can be used as a suitable value.
Okay, thank you. May I ask if Q235B will work? I am working on my undergraduate thesis, and Q235B is more suitable for strength calculations. I majored in safety engineering in my undergraduate studies, and I’m not sure why I was given the task of designing storage tanks; I’m not very familiar with this area~
The designer’s concept isn’t quite correct. The selection of equipment materials is determined based on the design temperature, design pressure, and properties of the medium, rather than choosing a material first and then determining the design temperature. Styrene is characterized by its explosive nature and moderate hazard level; it causes little corrosion to carbon steel, allowing carbon steel such as Q235B to be used as the main material. Additionally, to ensure that the medium temperature remains within a specified range, the storage tank should also be equipped with cooling pipes (the design details to be determined by the process engineering team).
Yes, I also mentioned in the introduction that for styrene, the physical properties were taken into account, and as for the storage temperature and pressure, standard conditions of 1 kp were chosen; a vertical cylindrical dome-shaped storage tank was used, with Q235B material selected for its construction； But due to an incomplete understanding of the national standards, it seems that many different standards can be used, so I’m reaching out to the experts here for advice~
Regarding the design temperature, it is necessary to take into account environmental conditions and mechanical operating conditions, which involves some practical experience from on-site work. During a previous on-site visit to the company, the design temperature specified in the design report was much higher than the storage temperature; it was only after asking questions that I learned that an experienced expert was needed to determine the appropriate design temperature~
All I’ve seen are carbon steel ones, with cooling via spraying from the outside or internal coils. We are from Shandong. In summer, it’s 35 degrees outside; after the temperature drops, it’s 25 degrees inside the tank.