Select this option if the branch pipe passes through a weld seam on the header pipe.
Paragraph 304.3.3 in the ANSI piping code states that if the branch does not penetrate a header weld, the value of 1.0 for the joint efficiency is used in the appropriate wall thickness equation. However, if the branch does penetrate a header weld, the user-defined value of E is used in the thickness equation.