For a given NPS, the OD stays fixed and the wall thickness increases with increase in schedule number.In other words, an NPS 14 pipe is actually 14 inches (360 mm) OD.įew general rules regarding nominal pipe size (NPS) and schedule, For NPS 14 and above – The NPS and OD values are equal.To find the actual OD for each NPS value, refer to the reference tables which are based on ASME standards B36.10M and B36.19M. For example, the OD of an NPS 12 pipe is actually 12.75 inches (324 mm). ![]()
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