In chemical production, what is the definition of high temperature and high pressure?
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In production, we often say that the operating conditions are high temperature and high pressure. But what exactly are the definitions of high temperature and high pressure in terms of material usage? Is there any difference in the classification of high temperature and high pressure for pipes versus containers or reactors? Please advise, and it would be great if you could list the relevant standard documents. Thank you!!
The pressure rating is determined in accordance with the Safety Technical Inspection Regulations for Pressure Vessels: First, based on the design pressure (p) of the pressure vessel, it is classified into four pressure categories: low pressure, medium pressure, high pressure, and ultra-high pressure. The specific classifications are as follows: (1) Low pressure (code L): 0.1 MPa ≤ P
Regarding the pressure, I agree with what was said above: a temperature of over 250 degrees is considered high. This is based on the GB50235 standards for the construction and acceptance of industrial metal piping systems, which specify that a temperature of over 250 degrees is required for thermal tightening of such pipes. No other sources provide this information; some materials state that a temperature of over 200 degrees counts as high.
The pressure rating is determined in accordance with the Safety Regulations for Pressure Vessels: 1. Based on the design pressure (p) of the pressure vessel, there are four pressure rating categories: low pressure, medium pressure, high pressure, and ultra-high pressure. The specific classifications are as follows: (1) Low pressure (code L): 0.1 MPa ≤ P
Have you seen reaction vessels for medium pressure, with temperatures around 200 degrees, or large-scale production equipment in workshops?