ANSI / ASME B16.36 Class 300 Weld Neck Orifice Flange Dimensions

ASME B16.36 Class 300 Weld Neck Flanges

Nominal Pipe Size Outside Diameter of RF
R		 Outside Diameter of Flange
O		 Minimum Thickness of Flange
tf		 Length through Hub
Y1		 Diameter of Hub
X		 Hub Diameter Beginning of Chamber
A		 Bore B1 Diameter of Pressure Connection
TT		 Bolt Circle Number of Holes Diameter of Holes Diameter of Bolts Machine Bolts Stud Bolts
Notes:

A) Dimensions are in millimeters, except for bolts and bolt holes.
B) Welding neck flanges NPS 3 and smaller are dimensionally identical to Class 600 flanges and may be so marked.
C) All other dimensions are in accordance with ASME B16.5.
D) Other NPT sizes may be furnished if required.
F) Bolt lengths include allowance for orifice and gasket thickness of 6 mm (0.25 in.) for NPS 1 to NPS 12 and 10 mm (0.38 in.) for NPS 14 to NPS 24.
G) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
H) Bore diameter of welding neck flanges is to be specified by the purchaser.