Hello every one,
On the Caesar spreadsheet there are two check boxes one for longitudinal weld joint efficiency( Eff.) and the other is the weld strength reduction factor ( Seam Weld , beneath wall thickness check box).
As my understanding they are both used for the wall thickness calculation, does Caesar calculate the hoop stress using this value?
Let s say my piping is Carbon steel Type E (means ERW, Ej=0.85) how does it affect my input, and ouput as well.
Could you please tell me what s the difference, on inputting the first one rather that the second one .
Thanks,

It depends which code you use for flexibility analysis. E.g. For B31.3, Ej will be used for wall thickness calculations and will be ignored for flexibility calculations. But for B31.1 it is used for allowable stress calculations but will be ignored for wall thickness calculations. Read ASME B31.3-2004/2006 Para 302.3.

For W, Read ASME B31.3-2004/2006 Para 302.3.5(e). It clearly explains when and how W is used. For more detailed explanation for Weld joint Strength Reduction Factor, you may get ASME Paper “New Weld Joint Strength Reduction Factor in the Creep Regime in ASME B31.3 Piping” by Charles Becht IV.

thanks for sharing you knowledge!!!