EN 1092 is a series of standard specifications for flanges and their joints – circular flanges for pipes, valves, fittings and accessories, PN designated. These directive codes are released by EU’s standardization organization CEN and they are mainly derived from relative British and German flange standards (BS 4504 & DIN, etc). EN 1092 covers four parts: Part 1(EN 1092-1): steel flanges; Part 2(EN 1092-2): cast iron flanges; Part 3(EN 1092-3): copper alloy flanges; Part 4(EN 1092-4): aluminium alloy flanges. Pressure ratings: from PN 2.5 to PN 400; Nominal size: from DN 10 to DN 4000.

The EN 1092 series of standard specifications are applicable in the following EU countries: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.