Design Features : Design and Manufacturing : BS 1868 Inspection and Testing : API 598 , BSEN 12666 PART 1 & 2 End Flanges Dimension : ASME B 16.5(for NPS ≤ 24”) Series A & B (for NPS ≥ 24), MSS SP – 44 (for NPS ≥ 24) BW End Dimension : ASME B 16.25 Face to Face & End to End Dimension : ASME 16.10, BS 2080 Gasket Design : ASME B 16.20 Disk Design : Gravitational acceleration