Classification of pipes and containers
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To all the experts passing by, for containers and pipelines shown in the table below, how should they be classified according to the definitions of pressure vessels and pressure pipelines? Does it fall under pressure vessels or pressure pipelines? :dizzy: 1. Pipeline: Medium: alkaline solution (liquid); Temperature: room temperature; Pressure: 1.0 Mpa; Pipe diameter: 150 mm. 2. Medium: alkaline solution (liquid); Temperature: room temperature; Pressure: 1.0 Mpa; Volume: 300 L
First, let’s understand the definitions of pressure vessels and pressure pipelines: 1. A pressure vessel is a device that can hold high-pressure gases or liquids. In industrial production, pressure vessels are widely used in fields such as petroleum, chemicals, metallurgy, pharmaceuticals, and food, playing an important role in production processes. 2. A pressure pipeline refers to a closed device used to transport substances such as gases and liquids and to generate a certain pressure in them. Based on the information provided above, we can classify it as follows: 1. Pipeline: Medium: Alkaline solution (liquid); Temperature: Room temperature; Pressure: 1.0 Mpa; Pipe diameter: 150 mm. This falls under the category of “pressure pipelines”. Because its main function is to transport liquid alkali, and there is a certain pressure during the transportation process. 2. Medium: Alkaline solution (liquid); Temperature: Room temperature; Pressure: 1.0 Mpa; Volume: 300 L. This falls under the category of \"pressure vessels\". This is because it is designed to store and transport high-pressure liquid alkali solutions, and pressure is generated during its use. It should be noted that to determine whether something constitutes a pressure vessel or a pressure pipeline, in addition to considering parameters such as the medium, temperature, and pressure, it is also necessary to take into account the specific design, manufacturing, and usage conditions, as well as complying with local or relevant regulations and standards. .
It can only belong to pressure pipelines; it cannot belong to pressure vessels.
The first is pressure pipelines; the second has incomplete conditions. But how can we be certain it is definitely not a pressure vessel? Poster: For Condition 2 with an alkaline medium, what is the filling coefficient (i.e., is there any gas space)? What are the device dimensions? If the volume of the gas phase space reaches 30 L, it still counts as a pressure vessel.
Diameter greater than 150 mm, full-liquid operation, no gas space
The container operates with a full liquid level, with no gas space. If its maximum operating temperature does not exceed the standard boiling point, can it still be considered a pressure vessel?
It cannot belong to a pressure vessel, as pressure vessels must be capable of generating a gas phase.
The second one does not belong to pressure vessels, because its operating temperature is at room temperature; it is a liquid whose temperature does not exceed the boiling point, so it is not considered a pressure vessel.
A pressure vessel, in a broad sense, refers to a sealed container with internal pressure higher than atmospheric pressure. In actual manufacturing, vessels that meet the criteria specified in TSG21-2016 are often referred to as pressure vessels, which are classified into Categories I, II, and III based on the degree of hazard in the event of failure ； Containers that do not meet the criteria specified in TSG21-2016 are referred to as non-pressure vessels, or as vessels outside this category.
How did you determine that it was a full-liquid operation with no gas space?