I am reviewing a drawing for a 3" 600# RTJ VanStone thermowell. ASME B16.5, Table 5, refers to note 4 when sizing the ring gasket. It clearly states to use the #30 ring rather than the #31. However, when I consider the K_min dimension, I am uncertain whether to use the dimension that corresponds to the #30 ring, which would be 5.25" diameter, or whether to use the dimension that corresponds to the #31 ring, which would be 5.75" diameter. Initially, I thought that 5.25" would be the correct choice, but now that I see the actual part being made and how little material is left on the outside of the groove in the VanStone, I'm second-guessing myself. The reference to Note 4 is shown in the ring-selection part of Table 5, but not in the K-diameter part.
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