The weld factor does not apply for seamless pipe (W = 1).
For design temperatures below the creep onset temperature W = 1. The weld factor (W) is only relevant for design temperatures in the creep range. The Y factor is calculated from diameter for thick wall pipe (D/t < 6), or from temperature for thin wall pipe. ASME B31.1 Power Piping Design Factor Calculator ModuleĬalculate ASME B31.1 power piping design factors (Weld factor W, Y factor and thinning allowance B).
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