Categorizing Vessels by Pressure, Design Temperature, and Installation
Pressure vessels can be classified based on various factors, including pressure-bearing methods, design temperature, and installation method.
1. Pressure-Bearing Methods:
Pressure vessels are categorized into two major types based on pressure-bearing methods:
(1) Internal Pressure Vessels: These containers have media pressure inside the shell. The design focuses on wall thickness determined by strength calculations.
(1) External Pressure Vessels: These containers have media pressure outside the shell. Design considerations primarily address stability issues, and they are generally considered safer than internal pressure vessels.
2. Design Temperature:
Pressure vessels are classified according to design temperature (t):
Low-Temperature Vessels: t ≤ -20℃
Normal-Temperature Vessels: -20℃ < t < 50℃
High-Pressure Vessels: t ≥ 450℃
3. Installation Method:
Pressure vessels can be categorized based on their installation method:
(1)Fixed Containers: Installed in a fixed location with relatively stable process conditions and operators. Examples include synthesis towers, steam balls, shell and tube waste heat boilers, heat exchangers, and separators.
(2)Mobile Containers: Used for storage and transportation, such as gas cylinders, automobile tank cars, and railway tank cars. These containers lack a fixed usage location, often experience changing environments, have more complex management, and are more prone to accidents.
1. Pressure-Bearing Methods:
Pressure vessels are categorized into two major types based on pressure-bearing methods:
(1) Internal Pressure Vessels: These containers have media pressure inside the shell. The design focuses on wall thickness determined by strength calculations.
(1) External Pressure Vessels: These containers have media pressure outside the shell. Design considerations primarily address stability issues, and they are generally considered safer than internal pressure vessels.
2. Design Temperature:
Pressure vessels are classified according to design temperature (t):
Low-Temperature Vessels: t ≤ -20℃
Normal-Temperature Vessels: -20℃ < t < 50℃
High-Pressure Vessels: t ≥ 450℃
3. Installation Method:
Pressure vessels can be categorized based on their installation method:
(1)Fixed Containers: Installed in a fixed location with relatively stable process conditions and operators. Examples include synthesis towers, steam balls, shell and tube waste heat boilers, heat exchangers, and separators.
(2)Mobile Containers: Used for storage and transportation, such as gas cylinders, automobile tank cars, and railway tank cars. These containers lack a fixed usage location, often experience changing environments, have more complex management, and are more prone to accidents.
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