Maximum length of straight pipe section without compensation
Thread Content
The maximum length of a straight pipe section without a compensator is 33 m for civil buildings and 42 m for industrial buildings. (The pipe elongations are 40 mm and 50 mm respectively). What is the theoretical basis for requiring that the pipe elongation in residential buildings not exceed 40 mm, and that it not exceed 50 mm in industrial buildings?
The theoretical basis for the pipe elongation in residential buildings not exceeding 40 mm and that in industrial buildings not exceeding 50 mm is the principle of thermal expansion. When the temperature of the medium flowing through the pipeline changes, both the pipe wall and the medium expand to varying degrees, which causes the length of the pipeline to change, either by stretching or shrinking. To prevent the pipeline from experiencing performance degradation or damage due to thermal expansion and contraction, appropriate measures need to be taken to compensate for the deformation of the pipeline. The maximum length for which a straight pipe section can be without compensation can be calculated based on factors such as the pipe material, diameter, type of fluid, and range of temperature changes. Generally, the maximum length of pipes in civil buildings is 33 m, and that in industrial buildings is 42 m; these values are determined after taking all these factors into consideration. .
Do you mean that this is experimental data with no theoretical basis?
The principle of thermal expansion cannot explain why the limit value is 40 millimeters; why not 35 or 38?
The maximum length for which a straight pipe section can be used without compensation generally depends on factors such as the pipe material, size, operating temperature, and pressure. For example, in the case of carbon steel pipes, the maximum length of a straight section that can be without compensation is usually around 6 meters. However, in the case of stainless steel pipes, due to their good mechanical properties and corrosion resistance, the maximum length of straight sections that can exist without the need for compensation can be increased appropriately. Additionally, it should be noted that in actual engineering projects, the stress conditions on the pipes must also be taken into account. Pipes at certain critical points require the installation of compensators to enhance their resistance to stress, which can also increase the maximum length of the pipes to a certain extent. Therefore, when designing pipelines, it is necessary to take various factors into account to ensure their proper operation and safety. .
The principle of thermal expansion cannot explain why the limit value is 40 millimeters; why not 35 or 38?
The maximum length of a straight pipe section that can be without compensation depends on various factors, including the length of the straight pipe, the pipe material, temperature changes in the pipe, the properties of the fluid, and the way the pipe is installed. Generally speaking, if the pipe length is short, the temperature changes are relatively small, and the material used has high strength, then it is possible to consider fixing the pipe directly to the supports without using any compensation mechanisms. However, in cases where the pipe length is large, the temperature difference is significant, the strength of the materials used is low, or the pipes need frequent maintenance, it is necessary to consider installing compensators in order to reduce the stress and deformation on the pipes and ensure their proper operation. Therefore, the maximum length for which a straight pipe section can be used without compensation needs to be evaluated and calculated based on specific circumstances. .
This post was last edited by xwxlovezyy on 2023-3-22 at 15:24. Table 7-23 on page 346 of the Power Design Manual (2nd edition) specifies a maximum length without compensation based on this value; what we want to know now is the basis for this figure. Additionally, it seems that this value cannot be calculated from the data provided in the Power Design Manual.
The maximum length for which a straight pipe section can be used without compensation needs to be determined based on specific circumstances. Generally speaking, the maximum length of a straight pipe section that can be without compensation should be less than a few meters. If the length of the straight pipe section is too large, it can cause the pipeline to bend or deform due to factors such as temperature changes, thereby affecting its normal operation. Therefore, it is generally recommended to install appropriate compensators in the pipelines to ensure their proper operation. .