Thickness Calculation Sheet

Date: 12-june-2007

Pipe Bend CalculationCode: ASME B31.1Edition: 2007

Design Data:Design Pressure: 39bar (550Psig)Design Temperature: 700FPipe Material: ASTM A106 Gr B, SeamlessPipe Size: 4” (100NB)Corrosion Allowance: 1.6mm (0.062”)

Sample Calculation:Step-IPipe Design Thickness Formula

P = Internal design gauge pressure.Do = Outside Diameter of pipe as listed in tables of standards or specifications or as

measured.S = Allowable Stress Value for material from Table A-1 E = Weld Joint Quality Factor from Table A-1A or A-1BY = Temperature Co-efficient from Table 304.1.1A = Additional allowance

550 x 4.5 tm = 2(15600 + 550 x 0.4) + 0.062

tm = 0.14022Required Thickness

tm tr = 0.875

0.014022= 0.875 tr = 0.16025

From Asme B 36.10 Schedule 30 and thickness = 0.188”When Pipe is ordered by its nominal wall thickness (Pipe size 4” schedule=30)

Step-II To Compensate for Thinning in bendsWall thickness for ordering Pipe prior to bending is according to table Table 102.4.5

Radius of Bend= 5Pipe diameter & thickness tm=1.08tm

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Thickness Calculation Sheet

Thickness 1.08tm= 1.08 x 0.14022(Pipe thickness) = 0.1514

Step-III

WhereP = Internal design gauge pressure, psig [Kpa (gage)]

Do = Outside Diameter of pipe, in (mm) S = Allowable Stress Value for material from Table A-1

E = Weld Joint Quality Factor from Table A-1 I = Thickness of (intrados & extrudes)

Y = Coefficients having the values as given in the tables 104.1.2(A) tm = Min. required thickness including Corrosion Allowance, in (mm) A = Additional Thickness, in (mm)

Step-VI

Thickness of Intrados

550 x 4.5 tm = 2(15600/1.06 + 550 x 0.4) + 0.062

tm = 0.1448Thickness of Extrudes

550 x 4.5 tm = 2(15600/0.9494 + 550 x 0.4) + 0.062

tm = 0.13631

Asme B 36.10 Schedule 30 and thickness = 0.188” this value comparing step II & step VI in this which value come grater this value give for pipe ordering

Code: ASME B31.3Pipe Bend Calculation Page 2 of 3

I = 1.06

I = 0.9494

Thickness Calculation SheetEdition: 2006

Pipe Bend thickness calculations using the Lorenz equation are not available in the standard ASME B31.3 Edition 2006.ASME B31.3 Edition is not available till date.

Pipe thickness from ASME B 36.10 consider as wall thickness for ordering Pipe

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