ASME B31.3 Process Piping

ASME B31.3 PROCESS PIPING - ALLOWABLE DESIGN PRESSURE Weld Joint Quality Factor (ASME B31.3 Table 302.3.4)

E  j j

1.00 Seamless ASTM A312 A312 TP304

Coefficient Y (ASME B31.3 Table 304.1.1) Design Temperature, °C

Y  T 

0.40 525 975°F

Weld Joint Strength Reduction Factor (ASME B31.3 Cl. 302.3.5(e))

W  S 

Material Allowable Stress, MPa (ASME B31.3 Table A-1M)

0.975 82.68 82.68 12 ksi ksi

Pipe Outside Diameter from Pipe Charts, mm

D

273.2 273.2 10.75" 10.75"

Nominal Wall Thickness from Pipe Charts, mm Manufacturing Tolerance (± %)

t m

12.77 12.5 1 .6 0 .0

Corrosion Allowance, mm Depth of Threading, Grooving or Machining, mm

c

Pressure Design Thickness, mm

t 

9.59

MADP 

5.82

Maximum Allowable Internal Design Gauge Pressure, MPa

 

Manufacturing Tolerances Aust Pipes ± 10%; American Pipes ± 12.5%

ASME B31.3 PROCESS PIPING - REQUIRED PRESSURE DESIGN WALL THICKNESS Weld Joint Quality Factor (ASME B31.3 Table 302.3.4)

E  j

1.00 Seamless ASTM A312 A312 TP304

Coefficient Y (ASME B31.3 Table 304.1.1) Design Temperature, °C

Y  T 

0.40 525 975°F

Weld Joint Strength Reduction Factor (ASME B31.3 Cl. 302.3.5(e)) Material Allowable Stress, MPa (ASME B31.3 Table A-1M)

W 

0.975 82.68 82.68 12 ksi ksi

Pipe Outside Diameter from Pipe Charts, mm Manufacturing Tolerance (± %) Corrosion Allowance, mm Depth of Threading, Grooving or Machining, mm

D

Design Pressure, MPa

 P 

Pressure Design Thickness, mm Minimum Required Thickness (including allowances), mm

S 

G

273.2 273.2 10.75" 10.75" 1 2 .5 1 .6 0 .0

Manufacturing Tolerances Aust Pipes ± 10%; American Pipes ± 12.5%

5.82 5.82 845 psi psi

t 

9.58

t m

12.77

0.377 inches 0.502 in inches Therefore Choose DN250 S/S pipe will a nominal thickness > 12.77 mm