OD identical to the nominal size for all pipe?

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Multiple Choice

OD identical to the nominal size for all pipe?

The outer diameter is not equal to the nominal size for pipe. The nominal size is a labeling system, not the actual measurement of the outside diameter. For a given nominal size, the outside diameter is set by standard pipe dimensions, while the inside diameter changes with wall thickness (the schedule). For example, a 1/2-inch nominal pipe actually has an outside diameter of 0.625 inches, and a 1 inch nominal pipe has an outside diameter of about 1.315 inches. The nominal size is used for fittings and flow references, not as the exact outside measurement. So stating that the OD matches the nominal size for all pipe is not correct.

The outer diameter is not equal to the nominal size for pipe. The nominal size is a labeling system, not the actual measurement of the outside diameter. For a given nominal size, the outside diameter is set by standard pipe dimensions, while the inside diameter changes with wall thickness (the schedule). For example, a 1/2-inch nominal pipe actually has an outside diameter of 0.625 inches, and a 1 inch nominal pipe has an outside diameter of about 1.315 inches. The nominal size is used for fittings and flow references, not as the exact outside measurement. So stating that the OD matches the nominal size for all pipe is not correct.

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