What is a spool in a pipeline?
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I’m working on a project abroad, and there’s a sentence in the documentation that reads: “For pipes less than 3 inches, an expansive spool should be considered in the piping design.” Looking up this term in a chemical engineering dictionary, it seems to refer to a pipe segment; but is expansion only taken into account for pipes that are 3 inches in diameter? I don’t understand. Does anyone know?
Here, a spool refers to a pre-made pipe component used to compensate for thermal expansion in pipe design. The document states that for pipes with a diameter of less than 3 inches, it is necessary to anticipate the need to use expansion spools during design. This does not mean that only pipes with a diameter of 3 inches need to be considered for expansion; it could be specific requirements or standards for this project. In fact, expansion may need to be considered for pipes of any size, depending on factors such as the pipe material, temperature, and pressure. .
A spool piece is a short tube with flanges on both the left and right sides; it is commonly known as a wheel tube
It seems to refer to temporary fake parts used for purging (in an extended sense), employed on pipes as substitutes for valves and similar components.
As mentioned above, expansion must be taken into account for all pipes over a certain length; however, the use of SPOOL here along with the standard of 3 inches is confusing
In my personal opinion, the spool referred to here is usually understood to be a short pipe with flanges, which serves to isolate the system; generally, there is a manual valve on the upstream side. Considering the expansion due to stress, we usually call it a loop.
In pipeline design, for pipes smaller than 3 inches, the need to install expansion joints should be anticipated. An expansion joint is a compensating fitting installed at the point where a pipe is fixedly connected to the ground; it allows for free expansion and contraction within a certain range, and can overcome the misalignment that occurs when pipes are aligned along different axes. Its main functions include compensating for the axial, lateral, and angular thermal deformation of pipelines, absorbing equipment vibrations and reducing their impact on the pipelines, as well as absorbing the deformation caused by earthquakes and land subsidence on the pipelines. By installing expansion joints in the pipes, it is possible to effectively prevent pipe breakage or joint failure caused by changes in pipe length due to heating or cooling. For pipes smaller than 3 inches, although the pipe diameter is small, the amount of expansion and contraction can still be quite significant when the entire piping system is heated or cooled simultaneously. Therefore, in pipeline design, it is very important to anticipate and install expansion joints to ensure the safe operation of the pipelines. A spool refers to an expansion joint; expansion joints can also be installed for diameters larger than 3 inches, and they can be made manually as well.