ReinfS1.xls
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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