ASME B16.36 Class 300 Threaded Orifice Flange Dimensions
| Nominal Pipe Size | Outside Diameter of RF R |
Outside Diameter of Flange O |
Minimum Thickness of Flange tf |
Diameter of Hub X |
Diameter of Counterbore | Counterbore (From Face) |
Diameter of Pressure Connection TT |
Bolt Circle | Number of Holes | Diameter of Holes | Diameter of Bolts | Machine Bolts | Stud Bolts | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Back QB |
Face QF |
F | G | ||||||||||||
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.
E) For slip-on and threaded flanges, verify that TT drilling extends
to inside diameter of pipe after assembly and is free from burrs.
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) Threaded flanges are furnished in NPS 1 to NPS 8 only.