I would like to ask everyone: in the design, the temperatures for the heat exchanger shell are specified as 456/313. Does this mean 313–456? Thank you
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I would like to ask everyone: in the design, the temperature values of 456/313 for the heat exchanger shell refer to 313–456, right? Thank you. Isn’t that usually the maximum temperature specified?
Got it! The 456/313 you mentioned generally refers to the design temperature range of the casing; 313°C is the lowest design temperature, while 456°C is the highest allowable design temperature, which also aligns with the idea that the highest temperature is usually indicated. However, different manufacturers may have slightly different conventions for labeling. If this parameter is to be used in a project, it is best to refer to the equipment’s drawings or consult the manufacturer to confirm the details, as that will ensure accuracy.
This is generally understood as the inlet temperature and outlet temperature
The design temperature is usually indicated as 456°C, meaning the operating temperature ranges from 0 to 456°C, while the design temperature itself is -40°C; the operating temperature range is from -40 to 0℃； Only for certain steel grades that are used at temperatures below 0°C or at temperatures other than 0°C is a working temperature range specified. For example, the working temperature range for Q345R extends up to -40°C; it should be written as -40~50°C, rather than just 50°C℃ ； For 15RCrMoR, write 20~200°C, etc.
It is speculated that the design takes into account two operating conditions
Generally, materials that are sensitive to temperature and experience temperature changes of over 110°C require a specific operating temperature range; for example, when the temperature of alloys exceeds 15°C, it is necessary to take into account the impact of temperature on these materials.