nominal bore
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The conversion factor to convert inches to "Nominal Bore" (NB) is 25.4 mm per inch. NB sizes are based on the internal diameter of a pipe, and they do not directly correlate to inches.
NB stands for "Nominal Bore" and refers to the nominal size of the valve in a piping system, typically measured in inches. It represents the internal diameter of the valve or pipe. It is an important parameter used to select the right valve for a specific application.
Nb is the chemical symbol of niobium.
The full form of "Nb" is Niobium. Niobium is a chemical element with the symbol Nb and atomic number 41. It is a shiny, grey, soft and ductile metal.
Niobium
62 feet is about 18.898 meters. (1 foot = about 0.304 meters).