What pressure does the maximum working pressure refer to in the Announcement on the Catalogue of Special Equipment [No. 114, 2014]?
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According to the definition of pressure pipelines in the catalog of special equipment, a pressure pipeline is a tubular device that uses certain pressure to transport gases or liquids. Its scope is defined as those with a maximum operating pressure of 0.1 MPa (gauge pressure) or more. Here, the maximum operating pressure refers to either the design pressure specified in the pipeline’s design documents or the operating pressure. I would appreciate a professional answer to this question; thank you all.
The operating pressure is generally lower than the design pressure
For us as valve manufacturers, the maximum operating pressure refers to the highest pressure at which the valve can be installed in a pipeline. Since the pressure in pipelines often fluctuates, for example, the normal pressure under operational conditions might be 10 kilograms, but sometimes it can rise suddenly to as high as 14 kilograms. This 14 kilograms represents the maximum operating pressure. Based on the normal pressure of 10 kilograms, the nominal pressure is 1.5 times the operating pressure; therefore, a nominal pressure of 1.6 MPa is sufficient. However, in some cases the maximum operating pressure can reach 14 kilograms, and for safety reasons, the nominal pressure of the valve is chosen to be 2.5 MPa. Therefore, the maximum operating pressure is quite important for valve selection. Especially in high-pressure environments
A pressure pipeline refers to a tubular device that uses a certain pressure to transport gases or liquids. It is defined as one whose maximum operating pressure is greater than or equal to 0.1 MPa (gauge pressure). Here, the maximum operating pressure refers to either the design pressure specified in the pipeline’s design documents or the operating pressure. I would appreciate a professional answer; thank you all. Isn’t work pressure just operational pressure? I don’t understand:L
Our design documents here include normal pressure, maximum pressure, and design pressure. Normal pressure is the pressure under normal operation, maximum pressure is the highest pressure that can be reached, and the design pressure is taken as the maximum pressure. When classifying pressure pipelines, classification is based on the maximum pressure.
The highest pressure that can be reached, including the operating pressure; for example, the pressure increase that occurs when the oil pipes are exposed to sunlight is also included
Here, what is meant by the maximum operating pressure – is it the design pressure or the operating pressure?
According to what you say, when determining whether a pipeline is considered a pressure pipeline, it is necessary to use the design pressure for that purpose. So, in the case of many pipelines whose operating pressure is less than 0.1 MPa, should they still be classified as pressure pipelines just because their design pressure is greater than 0.1 MPa? For example: a pipeline with an operating pressure of 0.06 MPa and a design pressure of 0.35 MPa, with a diameter of DN80, and carrying acidic gas as the medium
The maximum operating pressure is still considered part of the operating pressure. The pressure under which the device operates varies depending on different operating conditions; in actual operation, it takes on values within a certain range, rather than being a fixed value. The design pressure is determined during the design phase by referring to the upper limit of this range – that is, it is set based on the highest possible operating pressure