E In Figure the 4-in pipe mates smoothly with its support so that no stress concentration...

E In Figure the 4-in pipe mates smoothly with its support so that no stress concentration exists at D. At C the 3 ½-in pipe is placed inside the 4-in pipe with a spacer ring to provide a good fit. Then a ¼-in smoothly radiused fillet weld is used to secure the section together. Accounting for the stress concentration at the joint, determine how far out point C must be to limit the stress to 20 000 psi. Use Appendix for the stress concentration factor. Is the 4-in pipe safe at D1

FIGURE