In plumbing, NOM (short for nominal) refers to the approximate or standard dimension of a pipe or fitting, rather than its exact measurement. Nominal dimensions are used for identifying pipe sizes and fittings, providing a common reference point for compatibility and installation. For example, a nominal 1-inch pipe may have an actual outside diameter slightly larger than 1 inch. Understanding nominal measurements is crucial for selecting the right pipes, fittings, and components to ensure proper fit, pressure handling, and flow capacity in plumbing systems.
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