The global convention system has the benefit of using the global coordinate system also used by other analyses, such as pipe stress analysis. As a result, nozzle or attachment loads from another analysis can be used directly in the WRC 107/537 or FEA analysis.
The following global convention system is used for a cylindrical vessel:
The vessel direction is +Y direction Direction cosines of the vessel are:
Direction cosines of the nozzle are:
|
The following global convention system is used for a spherical vessel:
The direction of a spherical vessel is from points B to A |
The software uses these direction vectors to transfer the global forces and moments from the global convention into the traditional WRC107 convention.