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ASME B16.34-2025 Tools
Valves — Flanged, Threaded, and Welding End
Wall Thickness
Coefficient y
Minimum Wall Thickness Calculation
Appendix VI formula for valve body wall thickness.
t_m = Pd / [2SE + (1-y)P] + c
Unit System:
Metric (mm, MPa)
Imperial (in, psi)
Design Pressure P
MPa
Inside Diameter d
mm
Allowable Stress S
MPa
Weld Joint Factor E
0 < E ≤ 1
Material Coefficient y
0 ≤ y ≤ 1
Corrosion Allowance c
mm
Calculate
Material Coefficient y (Table V-1)
Material Group
--
Group 1.x — Ferritic Steels
Group 2.x — Austenitic Steels
Group 3.x — Nickel Alloys
Operating Temperature
°C
°F
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