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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 NeededInstructions:

(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 below for examples

(3) If the design pressure is higher than the joint pressure, JP, pressure, reinforcement is required. Table of Pi

(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. Pipe Outside

(6) The value for JP line 33 will then show your new maximum pressure and the area check. Size Dia, in. Std X 0.875

Typical Material Allowable Stresses: 1/8 0.405 0.068 0.060

 A106B,A53B Smls S = 15000 psi 1/4 0.54 0.088 0.077

JP = Allowable joint pressure based on ASME B31.9 - 2005 A53B,ERW SE= 12800 3/8 0.675 0.091 0.080

  2ShSb(dbTh+Tb^2(5+sina)) Same, Seam Uncut S = 15000 1/2 0.84 0.109 0.095(SbdbDh(3-sin a)+5ShTbDb) A53F, BW, Cont.Weld SE = 7200 3/4 1.05 0.113 0.099

Same, Seam Uncut S = 12000 1 1.315 0.133 0.116

JP = Allowable joint pressure 1-1/4 1.66 0.140 0.123

P= 2St/D A7 = th x d1 x (2-sina) ,sq.in.,(sq.mm.) 1-1/2 1.9 0.145 0.127

D = Nomina l pipe OD A1 = (2d2-d1)(Th-th)= db/sin a(Tm-PDm/2Sm), sq in(sq mm) 2 2.375 0.154 0.135

t = Required pipe wall = PD/2S A2 = 5Tb/sin a(Tb-tb), sq in (sq mm) 2-1/2 2.875 0.203 0.178

T = T-A, Nominal pipe wall less tolerance & corrosion. A3 = 2(0.7Tb)^2, sq in (sq mm) 3 3.5 0.216 0.189

h = main, header A4 = reinforcement, if needed, sq in (sq mm) 3-1/2 4 0.226 0.198

b = branch db = Db-2Tb 4 4.5 0.237 0.207

d1 = d2 = db/sina 5 5.563 0.258 0.226

Br.angle deg rad A4 = sq in 0.0000 6 6.625 0.280 0.245a = 90 1.5708 sin a = 1.0000 sq mm 0 8 8.625 0.322 0.282

10 10.75 0.365 0.319

12 12.75 0.375 0.328

Basic Maximum Allowable Working Pressure 14 14 0.375 0.328

Main Branch Max Main Max Br   16 16 0.375 0.328

Size Sh Dh Th Size Sb Db Tb JP Pm Pb 18 18 0.375 0.328

in psi in in in psi in in psi 20 20 0.375 0.328

8" 15000 8.625 0.322 4" 15000 4.5 0.237 655.27 1120 1580 24 24 0.375 0.328

Area Check: > 24 0.375 0.328

 A7 S A1 to A4  A1 A2 A3 A4 db

sq in sq in sq in sq in sq in sq in in

0.758 0.757 0.538 0.164 0.055 0.0000 4.026

Schedule o

Dia Outside

No. Dia. mm 5S 10S

Reinforcement:Main Branch 3 10.3 0.09 1.24

Size Sh Dh Th Size Sb Db Tb P A4 Reinf. db 6 13.7 1.24 1.65

in psi in in in psi in in psi sq in 10 17.1 1.65 1.65

8" 15000 8.625 0.322 4" 12800 4.5 0.237 700 0.133 4.026 15 21.3 1.65 2.11

20 26.7 1.65 2.11

25 33.4 1.65 2.77

METRIC UNITS -- SEE ASME B36.10 FOR METRIC DIMENSIONS 30 42.2 1.65 2.77

40 48.3 1.65 2.77

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Branch Connections

50 60.3 1.65 2.77

Size Sh Dh Th Size Sb Db Tb PF Pm Pb 65 73.0 2.11 3.05

DN kPa mm mm DN k/Pa mm mm kPa k/Pa k/Pa 80 88.9 2.11 3.05

200 103425 219.1 8.180 100 88256 114.3 6.020 4463 7723 9297 90 101.6 2.11 3.05

25 6.895 25.4 25.400 25 6.895 25.4 25.400 6.895 6.895 6.895 100 114.3 2.11 3.05

8 15000 8.626 0.322 4 12800 4.5 0.237 647 1120 1348 125 141.3 2.77 3.40

Area Check: 150 168.3 2.77 3.40

 A7 S A1 to A4  A1 A2 A3 A4 db 200 219.1 2.77 3.76

sq mm sq mm sq mm sq mm sq mm mm 250 273.0 3.04 3.96

300 323.8 3.96 3.96

483.465 482.741 353.0 94.204 35.516 0.0000 102.260 350 355.6 3.96 6.35

400 406.4 3.96 6.35

450 457.0 3.96 6.35500 508.0 4.78 6.35

600 601.0 5.54 6.35

> 600

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Branch Connections

pe Sizes and Schedules

US customary Units

40 X 0.875 XS 80 X 0.875 160 XXS

0.068 0.060 0.095 0.095 0.083

0.088 0.077 0.119 0.119 0.104

0.091 0.080 0.126 0.126 0.1100.109 0.095 0.147 0.147 0.129 0.187 0.294

0.113 0.099 0.154 0.154 0.135 0.218 0.308

0.133 0.116 0.179 0.179 0.157 0.250 0.358

0.140 0.123 0.191 0.191 0.167 0.281 0.382

0.145 0.127 0.200 0.200 0.175 0.281 0.400

0.154 0.135 0.218 0.218 0.191 0.344 0.436

0.203 0.178 0.276 0.276 0.242 0.375 0.552

0.216 0.189 0.300 0.300 0.263 0.438 0.600

0.226 0.198 0.318 0.318 0.278 0.636

0.237 0.207 0.337 0.337 0.295 0.531 0.674

0.258 0.226 0.375 0.375 0.328 0.625 0.750

0.280 0.245 0.432 0.432 0.378 0.719 0.864

0.322 0.282 0.500 0.500 0.438 0.906 0.875

0.365 0.319 0.500 0.594 0.520 1.125 1.000

0.406 0.355 0.500 0.688 0.602 1.312 1.000

0.438 0.383 0.500 0.750 0.656 1.406

0.500 0.438 0.500 0.844 0.739 1.594

0.562 0.492 0.500 0.938 0.821 1.781

0.594 0.520 0.500 1.219 1.067 1.969

0.688 0.602 0.500 1.219 1.067 2.3440.000 0.500 0.000

SI Units

r Designation, wall thickness in millimeters

Std 40 X S 80 120 160 XXS

1.73 1.73 2.41 2.41

2.24 2.24 3.02 3.022.31 2.31 3.20 3.20

2.77 2.77 3.73 3.73 4.87 7.47

2.87 2.87 3.91 3.91 5.56 7.82

3.38 3.38 4.55 4.55 6.35 6.35

3.56 3.56 4.85 4.85 6.35 9.70

3.68 3.68 5.08 5.08 7.14 10.15

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Branch Connections

3.91 3.91 5.54 5.54 8.74 11.07

5.16 5.16 7.01 7.01 9.53 14.02

5.49 5.49 7.62 7.62 11.13 15.24

5.74 5.74 8.08 8.08 16.15

6.02 6.02 8.56 8.56 11.13 13.49 17.12

6.55 6.55 9.53 9.53 12.70 15.88 19.05

7.11 7.11 10.97 10.97 14.27 18.26 21.95

8.18 8.18 12.70 12.70 18.26 23.10 22.23

9.27 9.27 12.70 15.09 21.44 28.58 25.40

9.53 10.31 12.70 17.48 25.40 33.23 25.40

9.53 11.13 12.70 19.05 25.40 35.71

9.53 12.70 12.70 21.44 30.96 40.49

9.53 14.27 12.70 23.83 34.93 45.249.53 15.09 12.70 26.19 38.10 50.01

9.53 17.48 12.70 30.96 46.02 59.54

9.53 12.70

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