8/9/2019 ReinfS1.xls
2/2
3/11/2012, ReinfS1.xls
Page 2 of 2Pipe Branch Reinforcement
per ASME B31.1 -2010 Power Piping Code
Branch (1) Calculations
Nom. thk. of pad: t nr = 0.322 in. =
8.18 mm
Width of pad from edge of branch: w r =
0.875 in. = 22.23 mm
Height of saddle above run: h s = n/a -
-
Optional Special Weld Dimensions:
Weld at pad or ring to branch periphery: W 1s = n/a -
-
Weld at ring, pad, or saddle outer edge: W 2s = n/a -
-Weld at saddle-to-branch periphery: W 3s = n/a - -
Angle between run and branch: α = 90
degrees
Integrally Reinforced B31.1 Branch:
Leg of 60 deg. triangle = n/a t r i = n/a
- -
Width integral reinf. area = (tr i) tan 30 w r
i = n/a - -
Other Dimensions
Inside centerline longitudinal dimension of finished branch
opening = [ D ob - 2 (T b - A )
] / sin α d 1 = 4.402 i
Half width of reinf. zone = d 1 or
(T b - A )+(T h -A ) + d 1
/ 2, whichever is greater, but not more than D oh
d 2 = 4.402 i
Reinf. zone height outside of run pipe, for ring or saddle = 2.5
(T h - A ) or 2.5 (T b - A ) +
t nr , whichever is less L r =
0.234 i
Reinf. zone height outside of run pipe, for integrally
reinforced fitting = 2.5 (T h - A ) L
i = 0.000 i
Reinf. zone height outside of run pipe = L r + L i L
4 = 0.234 i
Outside dimension of reinforcing ring or saddle (along run) = 2
w r + [ (D ob ) ( 2 - sin
α ) ] D r = 6.250 i
Minimum throat of fillet weld at saddle-to-branch = (smaller of
t nb or t nr ) ---[weld reference
para. 127.4.8(B)] t min = 0.000 i
Min. throat of weld at branch periphery (except saddle or
integrally reinf.) = smaller of 6.0 mm (1/4") or 0.7
t nb t c = 0.166 i
Minimum leg of weld at branch periphery (except saddle or
integrally reinf.) = t c / 0.707
W 1(min) = 0.235 i
Leg height of weld at branch periphery (except saddle or
integrally reinf.) = greater of W 1(min) or W 1s
W 1 = 0.235 i
Minimum leg of weld at outer edge of ring, pad, or saddle = 0.5
t nr / 0.707 W 2(min) =
0.228 i
W 2 = 0.228 i
Minimum leg height of fillet weld at saddle-to-branch periphery
= 0.7 t min /0.707 W 3(min)
= 0.000 i
Leg height of fillet weld at saddle-to-branch periphery =
greater of W 3(min) or W 3s
W 3 = 0.000 iMaximum width of ring, pad, or
saddle which would apply = d 2 -
(D ob / 2 ) / sin α WR max = 2.152
i
Reinforcement height (except weld) = lesser of (
t nr or L 4 ) , or lesser of (
t r i or L 4 ), as applicable
R h = 0.234 i
Reinforcement width (except weld) = (lesser of
w r or WR max ), or (lesser of
w r i or t ri ) tan 30, as applicable
R w = 0.875 i
Count of Welds Within Reinforcement Zone
Factor for complete fillet welds, other than on ring, pad, or
saddle edge, which will fit within the reinf. zone height
N wh = 0
Factor for complete fillet welds on ring, pad, or saddle edge
which will fit within reinforcement zone width
N ww = 2
Strength Correction Factors
Factor for strength correction of branch area = 1 if
SE b > SE h , or =
(SE b / SE h ) if SE b
SE h , or = (SE r /
SE h ) if SE r
