This standard specifies the characteristics of welded ferrules for inch series pipe couplings, 37°, in heat resisting steel, for aerospace applications. Nominal pressure: Class D in accordance with ISO 6771
DS/EN 4555:2003 history
2003DS/EN 4555:2003 Aerospace series - Pipe coupling, 37°, in heat resisting steel - Ferrules, welded - Inch series