Nominal Diameter

Numerical designation of size that is common to all components in a piping system, other than components designated by outside diameters or by thread size.

  • Note: 1 to entry: It is a convenient round number for reference purposes and is only loosely related to manufacturing dimensions.

Source: ISO 14692-1:2017, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping — Part 1: Vocabulary, symbols, applications and materials, Second Edition, August 2017. Global Standards

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