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The following chart gives standard pipe schedule or pipes sizes as given by ANSI / ASME B36.10M and API 5L . Data given in based on the NPS Tables given by ANSI B36.10M and includes Pipe wall thickness, outside diameter, nominal diameter. O.D. =. Outside Diameter.
OD (Outer Diameter): This is the measurement from one external edge of the pipe to the opposite external edge. Think of it like measuring the total width of your pipe from the outside. ID (Inside Diameter): This type of diameter means the distance from one internal extreme of the pipe to the other internal extreme.
For example, an NPS 2” pipe has an OD of 2.375” while an NPS 6” pipe has an OD of 6.625”, and an NPS 12” pipe has an OD of 12.75”. However, NPS 14” and above has an OD that matches their NPS designation. This means an NPS 14” pipe has an OD of 14”, an NPS 16” pipe has an OD of 16” and so on. Chart in Inches (In.)
The outer diameter (OD) of a hollow circular pipe is the measurement of the outside edges of the pipe passing through its center. The outer diameter of a pipe, together with its wall thickness, are essential to inside diameter calculations.
To measure the OD of a pipe, use a caliper or a tape measure to determine the distance across the widest point of the pipe’s outer surface. Ensure the measurement is taken perpendicular to the pipe. This OD measurement is crucial for identifying the pipe size and selecting compatible fittings.
Pipe Outer Diameter Chart. This chart is based on the most recent pipe standards and informaion supplied by pipe manufacturers. Always check the pipe O.D. or circumference before ordering pipe joining and repair products.
OD is the outside diameter of the pipe and is fixed for a given size. The NPS is very loosely related to the inside diameter in inches, but only for NPS 1/8 to NPS 12. For NPS 14 and larger, the NPS is equal to the outside diameter (OD) in inches.