This European Standard specifies requirements for circular copper alloy flanges and copper alloy collars combined with loose steel plate flanges in PN designations from PN 40 to PN 40 and nominal sizes from DN 1800 inThe types.
EN 1092-3:2003 history
2003EN 1092-3:2003 Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories PN designated - Part 3: Copper alloy flanges