Seal point statistics

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2.1 Classification of sealing points and scope of statistics 2.1.1 Dynamic sealing: The sealing of two mating surfaces in various mechanical and electrical equipment (including machine tools) that are in continuous motion (rotation and reciprocation) falls under dynamic sealing. Components such as compression shafts, pump shafts, and rotating shafts of various types of reactors all fall under dynamic sealing. 2.1.2 Static seal: In the operation of equipment (including machine tools and plant heating equipment) along with their associated pipelines and accessories, the seal between two mating parts that do not move relative to each other is considered a static seal. Such as flanges on equipment or pipelines, various valves, plug valves, and union joints ； Oil gauges and auxiliary pipelines on pump equipment ； The transformers, oil switches, cable terminations of electrical equipment, instrument orifice plates, control valves, auxiliary leads, and the joints of other equipment all constitute static seals. 2.2 Calculation method for sealing points 2.2.1 Calculation method for static sealing points: One sealing point is counted for each static sealing joint. For example, a pair of flanges is considered one sealing point, regardless of their size specifications ； A valve is generally considered to have four sealing points. If the valve is equipped with an additional plug or if there is an exhaust outlet right after the valve, a slightly higher amount should be accounted for ； A threaded union is considered to have three sealing points. In special cases, such as when the bolt holes of the connection flange are connected to the interior of the equipment, in addition to the joint surface which counts as one sealing point, each bolt hole requires its own sealing point. 2.2.2 Method for calculating leakage points: One leakage is counted as one leakage point; whether it is at a sealing point or due to weld cracks, porosity, corrosion, or other causes, such leaks are all counted as leakage points.