What does OD stand for in pipe measurements?

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Multiple Choice

What does OD stand for in pipe measurements?

In pipe measurements, the important dimension is the Outside Diameter, which is the measurement across the exterior of the pipe from outer edge to outer edge. This is the standard way we size pipes because fittings, flanges, and the piping system interface with the pipe along its outer surface. The Outside Diameter determines how the pipe fits into sockets, clamps, and couplings, and it’s the value most often specified on drawings and catalogs. This dimension contrasts with the Inside Diameter, which is the hollow bore of the pipe, and with wall thickness, which is derived from both OD and ID. For example, if a pipe has an outside diameter of 4 inches and an inside diameter of 3 inches, the wall thickness would be (4 − 3) / 2 = 0.5 inches. Other phrases like “over diameter,” “outer depth,” or “overall diameter” aren’t standard terms for pipe sizing and don’t describe the correct external measurement used for fitting and specification.

In pipe measurements, the important dimension is the Outside Diameter, which is the measurement across the exterior of the pipe from outer edge to outer edge. This is the standard way we size pipes because fittings, flanges, and the piping system interface with the pipe along its outer surface. The Outside Diameter determines how the pipe fits into sockets, clamps, and couplings, and it’s the value most often specified on drawings and catalogs.

This dimension contrasts with the Inside Diameter, which is the hollow bore of the pipe, and with wall thickness, which is derived from both OD and ID. For example, if a pipe has an outside diameter of 4 inches and an inside diameter of 3 inches, the wall thickness would be (4 − 3) / 2 = 0.5 inches. Other phrases like “over diameter,” “outer depth,” or “overall diameter” aren’t standard terms for pipe sizing and don’t describe the correct external measurement used for fitting and specification.

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