Description: the rated inlet pressure of the plant specified for normal working conditions; Name: nominal input pressure of the plant 
Description: Inlet pressure of the installation for the working conditions; Name: Rated inlet pressure of the installation
Description: PN (nominal pressure) is an alphanumeric variable for reference purposes, relating to a combination of mechanical and measurement properties of a pipe component. It comprises the letters PN followed by a dimensionless number (according to EN 1333/96.08); Name: Nominal pressure of the muffs, A1