The local stresses are calculated by some geometric parameters which can be extracted by curves. The nozzle is assumed to be penetrated to a cylindrical or spherical shell.Īs shown in figure 1, local stresses are calculated at 8 points, named as, located on two levels, upper and lower plates. WRC-107 consists of many curves enabling engineers to calculate all types of local stresses caused by external loads exerting on a circular or rectangular nozzle on shell elements. Its limitations, scope and concepts of local stress cause are mentioned here. There are some important items that engineers who use these softwares should be aware. Some well-known softwares such as CAESAR II, PVElit and Compress use this method for nozzle loads checking. This method was developed by Professor B.P.Bijlaard and firstly published by WRC in 1965. Welding research council bulletin 107 which is globally known as WRC-107 introduces one of well-known and important methods for calculation of local stresses in junction of shell and nozzle.
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