AS4041 Straight InternalAS4041 PRESSURE PIPING - ALLOWABLE DESIGN PRESSUREWeld Joint Factor (AS4041 Table 3.12.2 or D12)e1.00Product of e x M not less than 0.7Class Design Factor (AS4041 Table 3.12.3)M1.00e x M1Design Temperature, CT525Weld Joint Strength Reduction Factor (AS4041 Table 3.12.5)W0.975Material Design Strength, MPa (AS4041, Appendix D)f82.68Pipe Outside Diameter from Pipe Charts, mmD273.2Nominal Wall Thickness from Pipe Charts, mmtm12.77Manufacturing TolerancesManufacturing Tolerance ( %)12.5Aust Pipes 10%; American Pipes 12.5%Corrosion Allowance, mmG1.6Depth of Threading, Grooving or Machining, mm0.0Pressure Design Wall Thickness, mmtf9.57Maximum Allowable Design Pressure, MPaMADP5.86AS4041 PRESSURE PIPING - REQUIRED PRESSURE DESIGN WALL THICKNESSWeld Joint Factor (AS4041 Table 3.12.2 or D12)e1.00Product of e x M not less than 0.7Class Design Factor (AS4041 Table 3.12.3)M1.00e x M1.0Design Temperature, CT525.00Weld Joint Strength Reduction Factor (AS4041 Table 3.12.5)W0.975Material Design Strength, MPa (AS4041, Appendix D)f82.68Pipe Outside Diameter from Pipe Charts, mmD273.2Manufacturing Tolerance ( %)12.5Manufacturing TolerancesCorrosion Allowance, mmG1.6Aust Pipes 10%; American Pipes 12.5%Depth of Threading, Grooving or Machining, mm0.0Design Pressure, MPap5.82Pressure Design Wall Thickness, mmtf9.51Required Wall Thickness (including allowances), mmtm12.70Therefore Choose DN250 S/S pipe will a nominal thickness > 12.7 mm

ASME B31.3 Straight InternalASME B31.3 PROCESS PIPING - ALLOWABLE DESIGN PRESSUREWeld Joint Quality Factor (ASME B31.3 Table 302.3.4)Ej1.00Seamless ASTM A312 TP304Coefficient Y (ASME B31.3 Table 304.1.1)Y0.40Design Temperature, CT525975FWeld Joint Strength Reduction Factor (ASME B31.3 Cl. 302.3.5(e))W0.975Material Allowable Stress, MPa (ASME B31.3 Table A-1M)S82.6812 ksiPipe Outside Diameter from Pipe Charts, mmD273.210.75"Nominal Wall Thickness from Pipe Charts, mmtm12.77Manufacturing TolerancesManufacturing Tolerance ( %)12.5Aust Pipes 10%; American Pipes 12.5%Corrosion Allowance, mmc1.6Depth of Threading, Grooving or Machining, mm0.0Pressure Design Thickness, mmt9.59Maximum Allowable Internal Design Gauge Pressure, MPaMADP5.82ASME B31.3 PROCESS PIPING - REQUIRED PRESSURE DESIGN WALL THICKNESSWeld Joint Quality Factor (ASME B31.3 Table 302.3.4)Ej1.00Seamless ASTM A312 TP304Coefficient Y (ASME B31.3 Table 304.1.1)Y0.40Design Temperature, CT525975FWeld Joint Strength Reduction Factor (ASME B31.3 Cl. 302.3.5(e))W0.975Material Allowable Stress, MPa (ASME B31.3 Table A-1M)S82.6812 ksiPipe Outside Diameter from Pipe Charts, mmD273.210.75"Manufacturing Tolerance ( %)12.5Manufacturing TolerancesCorrosion Allowance, mmG1.6Aust Pipes 10%; American Pipes 12.5%Depth of Threading, Grooving or Machining, mm0.0Design Pressure, MPaP5.82845 psiPressure Design Thickness, mmt9.580.377inchesMinimum Required Thickness (including allowances), mmtm12.770.5024465582inchesTherefore Choose DN250 S/S pipe will a nominal thickness > 12.77 mm

AS4041 Bend InternalAS4041 PRESSURE PIPING - REQUIRED PRESSURE DESIGN WALL THICKNESS FOR BENDSWeld Joint Factor (AS4041 Table 3.12.2 or D12)e1.00Product of e x M not less than 0.7Class Design Factor (AS4041 Table 3.12.3)M1.00e x M1.0Design Temperature, CT525.00Weld Joint Strength Reduction Factor (AS4041 Table 3.12.5)W0.975Bend Radius, measured to pipe centreline, mmR11270Material Design Strength, MPa (AS4041, Appendix D)f82.68Pipe Outside Diameter from Pipe Charts, mmD273.2Manufacturing Tolerance ( %)12.5Manufacturing TolerancesCorrosion Allowance, mmG1.6Aust Pipes 10%; American Pipes 12.5%Depth of Threading, Grooving or Machining, mm0.0Design Pressure, MPap5.82"I" at the IntradosI1.060"I" at the ExtradosI0.951Pressure Design Wall Thickness @ Intrados, mmtf8.99Problem with AS4041 formula compared to ASME B31.3 formula.Pressure Design Wall Thickness @ Extrados, mmtf9.98The intrados should get thicker and the extrados thinner.Required Wall Thickness @ Intrados, mmtm12.10As thickness is "lost"during the bending process, it would be normalRequired Wall Thickness @ Extrados, mmtm13.24to multiply the required wall thickness at the extrados by a factor of1.1 to 1.125 dependent upon how "tight"the bend radius is. The resultingvalue will give the nominal thickness of pipe required for bending.

ASME B31.3 Bend InternalASME B31.3 PROCESS PIPING - REQUIRED PRESSURE DESIGN WALL THICKNESS FOR BENDSWeld Joint Quality Factor (ASME B31.3 Table 302.3.4)Ej1.00Coefficient Y (ASME B31.3 Table 304.1.1)Y0.40Design Temperature, CT525.00Weld Joint Strength Reduction Factor (ASME B31.3 Cl. 302.3.5(e))W0.975Bend Radius, measured to pipe centreline, mmR11270Material Allowable Stress, MPa (ASME B31.3 Table A-1M)S82.68Pipe Outside Diameter from Pipe Charts, mmD273.2Manufacturing Tolerance ( %)12.5Manufacturing TolerancesCorrosion Allowance, mmG1.6Aust Pipes 10%; American Pipes 12.5%Depth of Threading, Grooving or Machining, mm0.0Internal Gauge Pressure, MPaP5.82"I" at the IntradosI1.060"I" at the ExtradosI0.951Pressure Design Thickness @ Intrados, mmt10.14Pressure Design Thickness @ Extrados, mmt9.13Required Wall Thickness @ Intrados, mmtm13.42As thickness is "lost"during the bending process, it would be normalRequired Wall Thickness @ Extrados, mmtm12.26to multiply the required wall thickness at the extrados by a factor of1.1 to 1.125 dependent upon how "tight"the bend radius is. The resultingvalue will give the nominal thickness of pipe required for bending.

Sheet2

Sheet3