How to determine the material for the outer vessel of a cryogenic adiabatic pressure vessel
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A low-temperature insulated pressure vessel designed and manufactured in accordance with GB 18248 standards is a jacketed vessel, with its interlayer evacuated and filled with pearlescent sand. The inner container is made of stainless steel for use in low-temperature environments, and it falls into Category 3 according to the capacity regulations. Since the outer container is under an external pressure of 0.1 MPa due to vacuum, should it also be classified as a Category 3 container? Can carbon steel material be used under low-temperature conditions to take advantage of the reduced stress associated with such temperatures? Regarding domestic manufacturing, the outer containers are sometimes made of Q235B and sometimes of 16MnR – which is more appropriate? Can it be used in the Northeast region?
The two chambers of this container should be classified separately; the entire container is to be managed under 3 categories, with the inner container being designed and manufactured according to those 3 categories. The outer container should not be subject to regulatory control, so it is not classified. However, the outer container must also be designed and manufactured to meet the 150 standard. Is this the correct way to understand it? When the outer container is under external pressure and in a low-temperature environment, can carbon steel be selected based on the principles of low temperature and low stress?
The jacket is subject to external pressure; how can low-temperature and low-stress conditions be taken into consideration?
Can external pressure take low-temperature and low-stress conditions into account? It’s worth discussing. However, practice has shown that carbon steel for outer containers works well in low-temperature environments; does this meet the standards?
1. The quality of the materials used for the tank body shall comply with the provisions of the \"Safety Technical Supervision Regulations for Fixed Pressure Vessels\", **standards, and industry standards, taking into account compatibility with the medium. 2. The mechanical properties, bending properties, and impact test requirements of the tank body materials (steel plates, forgings, steel pipes, etc.) shall comply with the relevant provisions of TSG R0004 \"Regulations on Safety Technical Inspection of Fixed Pressure Vessels\", GB 150, and the standards referenced in the design drawings.
No conclusion has been reached on this issue yet; we can’t give up. Which expert can offer some guidance? There will be a reward
The commonly used ones are 16MnDR and 09MnNiDR.
Out! The casing should be selected based on the lowest temperature in the area where the container will be located: Q345R is used when the temperature is below -20°C, while Q235B is sufficient for other cases. Other materials are used only in special cases or at the user’s request.