Wall thickness is important because it determines the amount of internal pressure that the pipe can withstand. A pipe's schedule is the thickness of the pipe wall, which directly affects the interior dimension and weight of the pipe. While the Nominal Pipe Size identifies the outside diameter of the pipe, more information is needed to identify specific pipes. The DN dimensions must conform to ISO Standard 6708. Outside of North America, pipes are identified by Diametre Nominel (DN), which is a dimensionless value that roughly equates to the outside diameter of the pipe in mm. When specific pipes are specified, the NPS, Schedule, and material are required. Nominal Pipe Sizes apply to all materials of pipe. However, from NPS 14 and above, the NPS value matches the outside diameter of the pipe. Technically, the NPS is non-dimensional and only roughly refers to the diameter of the pipe. Nominal Pipe Size (abbreviated NPS) is a North American standard for identifying pipe sizes. Polyvinyl Chloride (PVC) Pipe Sizes - Schedule 80.Polyvinyl Chloride (PVC) Pipe Sizes - Schedule 40.Stainless Steel Pipe Sizes - Schedule 80S.Stainless Steel Pipe Sizes - Schedule 40S.Understanding Pipe Schedule Terminology.
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