1. Directive 97/23/EC of the European Parliament and of the council of 29 May 1997.
2. EN 13445-3:2009+A1:2012 Unfired pressure vessels. Design.
3. Eurocode 3: Design of steel structures.
4. EN 1993-1-8: Design of joints.
5. EN 1591-1 : 2002 Flanges and their joints - Design rules for gasketed circular flange connections - part 1: Calculation.