Branch Connections

Method for Determining if a Direct Branch Connection Will Meet a Design Condition Without Reinforcement
And if it Does Not, the Extent of Reinforcement Needed
Instructions:
(1) Enter the required branch angle in cell B26. Set cell J25 to zero.
(2) Enter the pipe data in cells A33 to H33. For welded pipe, if the weld seam of the main is not cut use S without the E factor. See typical materials list bel
(3) If the design pressure is higher than the joint pressure, JP, pressure, reinforcement is required.
(4) To calculate reinforcement area enter the pipe data on line 45 with the required design pressure under P.
(5) The required sq in of reinforcement will be under A4. Enter this value or whatever area you will use in cell J25.
(6) The value for JP line 33 will then show your new maximum pressure and the area check.

Typical Material Allowable Stresses:

A106B,A53B Smls S= 15000 psi
JP = Allowable joint pressure based on ASME B31.9 - 2005 A53B,ERW SE= 12800
2ShSb(dbTh+Tb^2(5+sin a)) Same, Seam Uncu S= 15000
(SbdbDh(3-sin a)+5ShTbDb) A53F, BW, Cont.Weld SE = 7200
Same, Seam Uncu S = 12000
JP = Allowable joint pressure
P= 2St/D A7 = th x d1 x (2-sina) ,sq.in.,(sq.mm.)
D = Nomina l pipe OD A1 = (2d2-d1)(Th-th)= db/sin a(Tm-PDm/2Sm), sq in(sq mm)
t = Required pipe wall = PD/2S A2 = 5Tb/sin a(Tb-tb), sq in (sq mm)
T = T-A, Nominal pipe wall less tolerance & corrosion. A3 = 2(0.7Tb)^2, sq in (sq mm)
h = main, header A4 = reinforcement, if needed, sq in (sq mm)
b = branch db = Db-2Tb
d1 = d2 = db/sina
Br.angle deg rad A4 = sq in 0.0000
a= 90 1.5708 sin a = 1.0000 sq mm 0

Basic Maximum Allowable Working Pressure

Main Branch Max Main Max Br
Size Sh Dh Th Size Sb Db Tb JP Pm Pb
in psi in in in psi in in psi
12" 15000 12.75 0.250 8" 15000 219.1 0.250 282.27 588 34
Area Check:

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A7 S A1 to A4 A1 A2 A3 A4 db
sq in sq in sq in sq in sq in sq in in
26.224 26.223 28.426 -2.264 0.061 0.0000 218.600

Reinforcement:
Main Branch
Size Sh Dh Th Size Sb Db Tb P A4 Reinf. db
in psi in in in psi in in psi sq in
12" 15000 12.75 0.250 8" 15000 8.625 0.250 700 2.680 8.125

METRIC UNITS -- SEE ASME B36.10 FOR METRIC DIMENSIONS

Size Sh Dh Th Size Sb Db Tb PF Pm Pb
DN kPa mm mm DN k/Pa mm mm kPa k/Pa k/Pa
300 103425 323.9 6.350 200 103425 219.1 6.350 2283 4055 5995
25 6.895 25.4 25.400 25 6.895 25.4 25.400 6.895 6.895 6.895
12 15000 12.752 0.250 8 15000 8.625984 0.250 331 588 869
Area Check:
A7 S A1 to A4 A1 A2 A3 A4 db
sq mm sq mm sq mm sq mm sq mm mm

737.896 737.090 572.7 124.830 39.516 0.0000 206.400

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See typical materials list below for examples

Table of Pipe Sizes and Schedules
US customary Units
Pipe Outside
Size Dia, in. Std X 0.875 40 X 0.875 XS 80 X 0.875 160 XXS

1/8 0.405 0.068 0.060 0.068 0.060 0.095 0.095 0.083

1/4 0.54 0.088 0.077 0.088 0.077 0.119 0.119 0.104
3/8 0.675 0.091 0.080 0.091 0.080 0.126 0.126 0.110
1/2 0.84 0.109 0.095 0.109 0.095 0.147 0.147 0.129 0.187 0.294
3/4 1.05 0.113 0.099 0.113 0.099 0.154 0.154 0.135 0.218 0.308
1 1.315 0.133 0.116 0.133 0.116 0.179 0.179 0.157 0.250 0.358
1-1/4 1.66 0.140 0.123 0.140 0.123 0.191 0.191 0.167 0.281 0.382
1-1/2 1.9 0.145 0.127 0.145 0.127 0.200 0.200 0.175 0.281 0.400
2 2.375 0.154 0.135 0.154 0.135 0.218 0.218 0.191 0.344 0.436
2-1/2 2.875 0.203 0.178 0.203 0.178 0.276 0.276 0.242 0.375 0.552
3 3.5 0.216 0.189 0.216 0.189 0.300 0.300 0.263 0.438 0.600
3-1/2 4 0.226 0.198 0.226 0.198 0.318 0.318 0.278 0.636
4 4.5 0.237 0.207 0.237 0.207 0.337 0.337 0.295 0.531 0.674
5 5.563 0.258 0.226 0.258 0.226 0.375 0.375 0.328 0.625 0.750
6 6.625 0.280 0.245 0.280 0.245 0.432 0.432 0.378 0.719 0.864
8 8.625 0.322 0.282 0.322 0.282 0.500 0.500 0.438 0.906 0.875
10 10.75 0.365 0.319 0.365 0.319 0.500 0.594 0.520 1.125 1.000
12 12.75 0.375 0.328 0.406 0.355 0.500 0.688 0.602 1.312 1.000

14 14 0.375 0.328 0.438 0.383 0.500 0.750 0.656 1.406

16 16 0.375 0.328 0.500 0.438 0.500 0.844 0.739 1.594
18 18 0.375 0.328 0.562 0.492 0.500 0.938 0.821 1.781
20 20 0.375 0.328 0.594 0.520 0.500 1.219 1.067 1.969
24 24 0.375 0.328 0.688 0.602 0.500 1.219 1.067 2.344
> 24 0.375 0.328 0.000 0.500 0.000

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SI Units

Schedule or Designation, wall thickness in millimeters

Dia Outside
No. Dia. mm 5S 10S Std 40 XS 80 120 160 XXS

3 10.3 0.09 1.24 1.73 1.73 2.41 2.41

6 13.7 1.24 1.65 2.24 2.24 3.02 3.02
10 17.1 1.65 1.65 2.31 2.31 3.20 3.20
15 21.3 1.65 2.11 2.77 2.77 3.73 3.73 4.87 7.47
20 26.7 1.65 2.11 2.87 2.87 3.91 3.91 5.56 7.82
25 33.4 1.65 2.77 3.38 3.38 4.55 4.55 6.35 6.35
30 42.2 1.65 2.77 3.56 3.56 4.85 4.85 6.35 9.70
40 48.3 1.65 2.77 3.68 3.68 5.08 5.08 7.14 10.15
50 60.3 1.65 2.77 3.91 3.91 5.54 5.54 8.74 11.07
65 73.0 2.11 3.05 5.16 5.16 7.01 7.01 9.53 14.02
80 88.9 2.11 3.05 5.49 5.49 7.62 7.62 11.13 15.24
90 101.6 2.11 3.05 5.74 5.74 8.08 8.08 16.15
100 114.3 2.11 3.05 6.02 6.02 8.56 8.56 11.13 13.49 17.12
125 141.3 2.77 3.40 6.55 6.55 9.53 9.53 12.70 15.88 19.05
150 168.3 2.77 3.40 7.11 7.11 10.97 10.97 14.27 18.26 21.95
200 219.1 2.77 3.76 8.18 8.18 12.70 12.70 18.26 23.10 22.23
250 273.0 3.04 3.96 9.27 9.27 12.70 15.09 21.44 28.58 25.40
300 323.8 3.96 3.96 9.53 10.31 12.70 17.48 25.40 33.23 25.40
350 355.6 3.96 6.35 9.53 11.13 12.70 19.05 25.40 35.71
400 406.4 3.96 6.35 9.53 12.70 12.70 21.44 30.96 40.49
450 457.0 3.96 6.35 9.53 14.27 12.70 23.83 34.93 45.24
500 508.0 4.78 6.35 9.53 15.09 12.70 26.19 38.10 50.01
600 601.0 5.54 6.35 9.53 17.48 12.70 30.96 46.02 59.54
> 600 9.53 12.70

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