PN - nominal pressure. alphanumerical designation used for reference pouposes related to a combination of mechanical and dimensional characteristics of a component of a pipework sysem. It comprises the letters PN followed by a dimensionless number.
DN - nominal size. alphanumerical designation of size for components of a pipework system, which is used for reference purposes. It comprises the letters DN followed by g dimensionless whole number which is indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end connections. |