Calculation of Pipe Reinforcement ASME B31.3

PRESSURE DESIGN STRAIGHT PIPE ( RUN PIPE)

GENERAL tm=t+c Where tm

minimum required thickness, including mechanical, corrosion, & erosion allowances, mm. pressure design thickness for internal pressure, mm. sum of th the mec ha hanical al allowanc es es (t (thread or gr groov e depth) pl plus co corrosion & er erosion al lo lowances, mm mm.

t c

10.86 9.36 1.5

STRAIGHT PIPE THICKNESS UNDER INTERNAL PRESSURE

1.

t=(PxD)/2(SxExW+PxY)

9.36

2. t=P(d+2c)/2[SxExW-P(1-Y)]

Where P D S E W Y d

Internal Design Gauge Pressure, N/mm 2. Outside Diameter of Pipe, mm. Stress Value for Material, N/mm2. Quality Factor For Longitudinal We Weld Joints in Pipes. Weld Joint Strength Reduction Factor. Coefficient for Materials. Inside Diameter of Pipe, mm.

REINFORCEMENT OF WELDED BRANCH CONNECTIONS CONNECTIONS

4.2 406.4 88.25 1 1 0.7 364.40

8.87

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h b Th

subs subscr crip iptt ref refer erri ring ng to run run or or hea heade der. r. subs subscr criipt refe referrring ing to to br branch. nch. nominal thickness of run or header.

21

Tb

nominal thickness of branch.

13

d1

effe effect ctiv ive e leng length th rem removed oved from from pipe pipe at bran branch ch,, mm. mm.

199. 199.35 35

d2

"half width" of reinforcement zone, mm.

199.35

L4

heig height ht of of rei reinf nfor orce ceme ment nt zon zone e out outsi side de of of run run pipe pipe,, mm. mm.

42.1 42.19 9

Tb

branch pipe thickness, mm.

11.38

Th

header pipe thickness, mm.

18.38

Tr

minimum thickness of reinforcing pad, mm.

18.4

th

pressure design thickness of run pipe, mm.

9.36

tb

pressure design thickness of branch pipe, mm. smaller angle between axis of branch and run.

5.12 90

β Db Dh

outside diameter of branch pipe, mm.

219.10

outside diameter of run pipe, mm.

406.40

1. d1 = [Db - 2(Tb - c)]/sin β

199.35

2. d2= greater of d1 or (Tb - c) + (Th - c) + d1 /2

126.43 199.35

Therefore d2

3.

L4 = lesser of 2.5(Th - c), mm or

42.19 43.09

2.5(Tb - c) + Tr , mm.

REQUIRED REINFORCEMENT AREA

1. A1 = thd1(2 - sinβ), mm2

1865.70

AVAILABLE AREA

A2 + A3 + A4 >= A1

Where A2

Area resulting from excess thickness in the run pipe wall, mm2.

1498.33

A3

Area resulting from excess thickness in the branch pipe wall, mm2.

401.51

A4

Area of other metal provided by welds & properly attached reinforcement, mm2.

-34.14

Dr

Outside diameter of reinforcement ring, mm.

406.4

Sr

Stress value for reinforcement ring material, N/mm2.

88.25

ha

Height of the fillet weld between run pipe & reinforcement ring, mm.

3.00

hb

Height of the fillet weld between branch pipe & reinforcement ring, mm.

3.00

1. A2 = (2d2 - d1)(Th - th -c)

1498.33

2. A3 = 2L4(Tb - tb - c)/sinβ

401.51

3. A2 + A3

1899.85

Additional reinforcement required A1 - ( A2 + A3 ) <= A 4

NO

-34.14

1. Area of reinforcement ring, mm2. 2. Area of fillet weld, mm 2.

3441.64 18.00





4. d2 in any case shall not be greater than Dh.





PRESSURE DESIGN STRAIGHT PIPE ( BRANCH PIPE)

GENERAL tm=t+c Where tm

minimum required thickness, including mechanical, corrosion, & erosion allowances, mm. pressure design thickness for internal pressure, mm. sum of th the mechanical al allowances (t (thread or gr groove depth) pl plus co corrosion & er erosion allowances, mm mm.

t c

6.62 5.12 1.5

STRAIGHT PIPE THICKNESS UNDER INTERNAL PRESSURE

1.

t=(PxD)/2(SxExW+PxY)

5.12

2. t=P(d+2c)/2[SxExW-P(1-Y)]

Where P D S E W Y d

Internal Design Gauge Pressure, N/mm 2. Outside Diameter of Pipe, mm. Stress Value for Material, N/mm2. Quality Factor For Longitudinal Weld Joints in in Pipes. Weld Joint Strength Reduction Factor. Coefficient for Materials. Inside Diameter of Pipe, mm.

4.20 219.1 88.25 1 1 0.4 193.10

4.80























Calculation of Pipe Reinforcement ASME B31.3

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