Introduction of pressure temperature medium
pressure
The pressure of the pressure vessel can come from two aspects, one is that the pressure is generated (increased) outside the container, and the other is that the pressure is generated (increased) inside the container.
The highest working pressure refers to the highest pressure that may occur at the top of the container under normal operating conditions.
Design pressure refers to the pressure used to determine the thickness of the container shell at the corresponding design temperature, that is, the design pressure of the container marked on the nameplate. The design pressure of the pressure vessel shall not be lower than the maximum working pressure; When the static pressure of the liquid column subjected to the pressure component reaches 5% of the design pressure, the design of the part or component shall be calculated by the sum of the design pressure and the static pressure of the liquid column; the design pressure of the pressure vessel equipped with the safety valve shall not be Below the opening pressure or burst pressure of the safety valve. The design pressure of the container shall be determined in accordance with the corresponding provisions of GB 150.
temperature
Metal temperature is the average temperature of the pressure member of the container along the thickness of the section. In any case, the surface temperature of the component metal must not exceed the allowable temperature of the steel.
Design temperature is the highest or lowest temperature that a container wall or component metal may reach under normal design conditions under the appropriate design pressure. When the temperature of the shell wall or component metal is lower than -20 ° C, the design temperature is determined according to the lowest temperature; in addition, the design temperature is selected according to the highest temperature. The design temperature shall not be lower than the highest metal temperature possible for the component metal; for metal temperatures below 0 °C, the design temperature shall not be higher than the lowest metal temperature possible for the component metal. The design temperature of the container (ie, the temperature of the design medium marked on the nameplate of the container) refers to the design temperature of the housing.
medium
The production process involves a wide variety of media and a variety of classification methods. Classified according to the state of matter, there are gases, liquids, liquefied gases, simple substances and mixtures; according to chemical characteristics, there are four kinds of flammable, flammable, inert and combustion-supporting; according to their degree of toxicity to humans, they can be classified into extreme hazards ( I), high hazard (II), moderate hazard (III), and mild hazard (IV).
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