How to design low-temperature containers?
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I would like to ask the experts: I have a steam cooler whose heat source is saturated steam at 125°C, and which needs to be cooled down to 25°C. The cooling water used is cold brine at -20°C, although its temperature must not drop below -15°C. Can this type of heat exchanger be designed as a conventional one? If so, what considerations are necessary?
Consider the low-temperature condition; the materials and processes are different from those at normal temperature
There is a design concept known as low temperature and low stress, which allows one to legally avoid low-temperature design at temperatures that are not extremely low, such as in the heat exchanger mentioned by the original poster.
How exactly should I put it, bro? Is a design temperature of -20°C and an operating temperature of -20°C okay?
But in terms of cost, the difference between Q345R and 16MnDR is enormous
See the last appendix in the design section of GB150
This situation is not suitable for low temperature and low stress conditions; low temperature and low stress refer to situations where the shell’s temperature drops below -20 degrees due to environmental factors, while this case is influenced by the temperature of the medium； In container design, conditions where *inertia is less than -19 degrees are classified as low-temperature containers; according to GB50, those with temperatures below -20 degrees are considered low-temperature containers ； Additionally, the minimum inlet temperature of the medium for this equipment is -20 degrees, while the maximum inlet temperature is 125 degrees; there is a significant temperature difference, so the expansion coefficients of the casing and the tube bundle must be taken into account during design.
The device mentioned by the original poster does not belong to a cryogenic vessel.