Pipe bore is the actual minimum inside diameter of a pipe, which is not necessarily the nominal pipe size.
Use full bore for applications where pressure drop should be minimum (such as in the suction pipe of a pump with required NPSH very close to available NPSH), or for pipes which could be cleaned with a pig (so that the pig doesn't get stuck on the valve). In other applications a reduced bore should be OK.
NB (nominal bore) is the European designation equivalent to NPS is DN (diamètre nominal/nominal diameter/Durchmesser nach Norm), in which sizes are measured in millimeters. NB (nominal bore) is also frequently used interchangeably with NPS.You can refer more details herehttp://www.piping-engineering.com/nominal-pipe-size-nps-nominal-bore-nb-outside-diameter-od.html
Blood vessels, can contribute to Blood Pressure, as a result of their Bore diameter. This can be regulated by the Blood Vessel either Constricting (reducing its Bore Diameter) or Dilating (increasing its Bore Diameter). The pressure of given volume of fluid, is inversely proportional, to the diameter of the pipe through which it must flow. Hydraulics 101.
NB is nominal bore of that pipe, that doesn't mean that the pipe diameter (Inner or Outer)will be equal to the NB, but it is an digit nearest to the out side diameter of the pipe. That digit will be an easily memorable one like 25, 20, 32, 40 etc (Not like 23.25, 27.5, 41.8 etc). In standard pipes, the NB and the outside diameter will be same from 14 inches and above...
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