General - ASME/ANSI B16.5 & B16.47
Weld Neck Flanges - Welding Ends
ASME/ANSI B16.5 (NPS 1/2 to 24) Weld Neck Flange
Bevel (with no backing ring) for Wall Thicknesses (t)
from 0.19 to 0.88 in (4.83 to 22.35 mm).
ASME/ANSI B16.5 (NPS 1/2 to 24) Weld Neck Flange
Bevel (with no backing ring) for Wall Thicknesses (t)
>0.88 in (22.35 mm).
ASME B16.47 and MSS SP-44 (>NPS 24) Weld Neck
Flange Bevel (with no backing ring) for Wall
Thickness (t) = 0.19 to 0.88 in (4.83 to 22.35 mm).
ASME B16.47 and MSS SP-44 (>NPS 24) Weld Neck
Flange Bevel (with no backing ring) for Wall
Thicknesses (t) > 0.88 in (22.35 mm).
Note
- t = Nominal wall thickness of the pipe. Additional thickness at the weld bevel (up to 0.5 x t) may be provided on the inside
or outside diameter (or partially on both) of the hub if it is used with light walled higher strength pipe. Hub diameter, F, may
also be increased.
Tolerances on welding end dimensions (ASME/ANSI B16.5 and B16.47, and MSS SP-44)
Dimension Range Tolerance
in mm
E (outside diameter at
welding end)
< NPS 5 +0.09, -0.03 +2.29, -0.76
NPS 6 to 24 +0.16, -0.03 +4.06, -0.76
> NPS 26 +0.21, -0.06 +5.33, -1.52
B (inside diameter of
flange)
B < NPS 10 ±0.03 ±0.76
B > NPS 12 to 18 +/-0.03 ±0.76
B > NPS 20 +0.12, -0.06 +3.05, -1.52
t (thickness at weld bevel) All >87.5%
