Definition of normal temperature
Thread Content
In chemical engineering design, does normal temperature refer to 20°C? Is there a clear source in the regulatory standards? Thank you
There is no precise definition for this; current standards specify actual temperature values, rather than using this vague concept. The room temperature that was commonly mentioned before was 20℃
The normal temperature is not specified, nor is it mentioned in the standards; instead, a specific value for the operating temperature is given. Room temperature is used in the tensile bending test.
Before the adoption of the SI system, this temperature was used as the standard; now that a standard has been established, 0°C is designated as the standard temperature. For the temperatures mentioned in certain processes, you should convert them according to the relevant rules, or simply use those temperatures directly. For reference.
Normal temperature is generally considered to be between 0°C and 40°C, referring essentially to the temperature of the atmospheric environment, with temperatures below zero excluded.
The design temperature of many pipes is at room temperature; is this in compliance with standards?
It’s not standardized; usually, the operating temperature can be indicated as room temperature, but the design temperature must be specified as a specific value.
Room temperature is a very vague concept, and the values vary across different industries; it is generally advisable to provide a specific figure.
Personal opinion. In accordance with the Code for Fixed Pressure Vessels, 3.1.9.3 for pressure vessels storing liquefied gases at normal temperatures, and 3.1.10. It can be assumed that it refers to the temperature of the environment. ≤50°C. Then, in GB150, the term “low-temperature vessel”. It can be considered as ≥-20°C. Therefore, -20℃ ≤ normal temperature ≤ 50℃. The above is complete nonsense; don’t take it seriously. It is the designer’s responsibility to select the appropriate design data; as a designer, one should be precise and write down the exact value, avoiding anything that could lead to ambiguity or inaccuracy.