How to Classify Vessels as for Pressure-bearing, Design Temperature & Installation?
What types of pressure vessels are classified according to pressure-bearing methods?
According to different pressure-bearing methods of the shell, pressure vessels can be divided into two major categories: internal pressure (media pressure inside the shell) and external pressure (media pressure outside the shell). These two types of containers are quite different.
The difference is first reflected in the design principle. The wall thickness of the internal pressure vessel is determined according to the strength calculation, the design of external pressure vessels mainly considers stability issues; secondly, reflected in safety, external pressure vessels are generally safer than internal pressure vessels.
How to classify pressure vessels according to design temperature?
According to the height of design temperature (t), pressure vessels can be divided into low-temperature vessels (t≤-20℃), normal-temperature vessels (-20℃<t<50℃) and high-pressure vessels (t≥450℃).
How to classify pressure vessels in terms of installation method?
According to the installation method, pressure vessels can be divided into two categories: fixed vessels and mobile vessels:
① Fixed container.
Refers to a fixed installation and using location, process conditions and use of the operator is relatively fixed, usually a container connected to other equipment by piping, such as synthesis tower, steam ball, shell and tube waste heat boiler, heat exchanger, separator, etc.
②Mobile container.
Refers to a storage and transportation container, such as gas cylinders, automobile tank cars, railway tank cars, etc. Its main purpose is to ship pressured gas or liquefied gas. There is no fixed using place for such containers, and there is generally no fixed operator. The use environment often changes, the management is more complicated, and accidents are more likely to occur.
According to different pressure-bearing methods of the shell, pressure vessels can be divided into two major categories: internal pressure (media pressure inside the shell) and external pressure (media pressure outside the shell). These two types of containers are quite different.
The difference is first reflected in the design principle. The wall thickness of the internal pressure vessel is determined according to the strength calculation, the design of external pressure vessels mainly considers stability issues; secondly, reflected in safety, external pressure vessels are generally safer than internal pressure vessels.
How to classify pressure vessels according to design temperature?
According to the height of design temperature (t), pressure vessels can be divided into low-temperature vessels (t≤-20℃), normal-temperature vessels (-20℃<t<50℃) and high-pressure vessels (t≥450℃).
How to classify pressure vessels in terms of installation method?
According to the installation method, pressure vessels can be divided into two categories: fixed vessels and mobile vessels:
① Fixed container.
Refers to a fixed installation and using location, process conditions and use of the operator is relatively fixed, usually a container connected to other equipment by piping, such as synthesis tower, steam ball, shell and tube waste heat boiler, heat exchanger, separator, etc.
②Mobile container.
Refers to a storage and transportation container, such as gas cylinders, automobile tank cars, railway tank cars, etc. Its main purpose is to ship pressured gas or liquefied gas. There is no fixed using place for such containers, and there is generally no fixed operator. The use environment often changes, the management is more complicated, and accidents are more likely to occur.
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