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There is a project in which some pipes have an internal polishing finish (Ra=0.4 and 0.8). For the instruments and valves installed on these pipes, how should they be selected? For example, regarding thermometers, does the data sheet indicate that the material of the part in contact with the liquid needs to be polished? What about other instruments and valves? Is it the same in their case? Those who have worked on similar projects, please give me some advice
When selecting instruments for internal polishing of pipes, in addition to considering the performance parameters of the equipment itself, it is also necessary to take into account the material of the equipment and whether the polishing treatment meets the design requirements. First, it is necessary to understand the specific operating conditions of the project, including the medium, temperature, pressure, etc., in order to determine the appropriate types of instruments and valves. Ensure that the selected equipment meets the operational requirements. For pipes that require internal polishing, the parts of these pipes where instruments make contact with them should also be polished accordingly, in order to ensure the cleanliness of the entire piping system and to prevent residues or contamination of the medium at the instruments and valves. This requires that, when selecting a product, it be confirmed with the manufacturer whether they can provide polishing instruments that meet the requirements. Regarding the specific details of selection, thermometers should be chosen based on factors such as their range, measurement location, and installation method. If polishing of the part that comes into contact with liquids is required, this requirement should generally be mentioned to the manufacturer during the selection process, to see if they can provide such a service. The selection of valves also needs to be based on the actual operating conditions, such as working pressure, operating temperature, diameter, and valve body material. Similarly, if polishing is required, it is necessary to confirm this with the manufacturer as well. In general, when making a selection, the actual operational requirements should be the primary consideration, while also ensuring that the equipment chosen can meet the needs of polishing processes. It is recommended that you have in-depth discussions with the equipment supplier to clarify your specific requirements. If conditions permit, it is advisable to consider inviting technical experts for an on-site inspection in order to make a more accurate selection. .
Pipes are required to be polished, that is, to reduce the frictional resistance on their inner walls and minimize contamination. Now, hydrogen pipelines sometimes also use internally polished pipes, such as BA pipes or even more advanced types of pipes. However, for those in contact with valves and instruments, these materials are mostly machined, and the contact area is very small; therefore, they generally meet the requirements as well. No note is needed for polishing. Surface degreasing or other treatment methods can be requested.