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Questions regarding the NB/T47023-2012 standard

2019-05-27View Original

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In Table 3 on page 70 of the revised NB/T47023-2012 standard (the table for correcting the total height H of long-neck welded flanges), there are two sets of values for the DN2200 PN1.0MPa welded flanges with necks: 12/200 and 14/200. These values indicate that the numerator represents the thickness of the mating cylinder, while the denominator represents the height H of the flange. So why are there two such sets of values? Why doesn’t the H value appear in the other cases as well? It’s the same situation (As can be seen from the figures in the table, increasing the thickness of the cylinder reduces the corresponding flange H value.)

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