1. Approach

We present here the first phase of the study of the equations of EN 1591, which concerns the equations of reference document CR 13642 relating to one-piece flange connections with a flat gasket. The notations and symbols used in the standard are listed in the table at the end of the text.

We have chosen to follow the structure (paragraph numbers and titles) of CR 13642, without however reproducing all the equations.

To read the following with profit, it is therefore necessary to have it available and to follow its content in parallel with our comments below. This text is available from AFNOR :

Reference FD CR 13642 — Flanges and their joints: calculation rules for gasketed circular flange joints, December 2000, classification index E86-402. This document was drawn up by CEN/TC 74, the technical committee behind...