... standard: API6D, API600.Face to face dimensions: ANSI/ASME B16.10.Flange connection: ANSI/ASME B16.5 for NPS24,ASME B16.47A ... /MSS SP-44 for NPS>24.Butt-welding end dimensions: ANSI/ASME B16.25.Inspection & test standard: API6D, API598.Pressure: 150Lb ... , CF8(304), CF8M(316), CF3(304L), CF3M(316L), etc. API Y strainer