What is Nominal Pipe Size (NPS) & Pipe Schedule (SCH)?
  Nominal Pipe Size: Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. The name NPS is based on the earlier "Iron Pipe Size" (IPS) system. That IPS system was established to designate the pipe size. The size represented the approximate inside diameter of the pipe in inches. An IPS 6" pipe is one who’s inside...
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