![]() (T is the combined shell and pad thickness). If using re-pad, you can use the same square root (RxT) and ignore the stress at the edge. Square root (RxT) is the distance the local bending stresses in the vessel dissipate to the point of being negligible.Ģ. R is the vesssel mean radius of curvature, T is the insert plate thickness.īy doing that, you can run the local stress analysis just at the nozzle to shell junction with shell thickness as 0.75". The insret can be square with 2"-3" radius round corner. If using insert plate, which is not uncommon, making sure the width of the insert plate, measured from outside of the nozzle, is not less than: square root (RxT) plus width of the taper section (which in your case will be 1.125" for a 3:1 taper). Don't confuse the pressure requirement per UG-37 vs. Here are our solutions to this problem coming all the time.
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