Specifies the direction vector or direction cosines which defines the center-line of the vessel. For example, a vertical vessel in a Y-up coordinate system, these entries would read:
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Vessel Centerline Direction Cosine VX - <blank>
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Vessel Centerline Direction Cosine VY - 1.0
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Vessel Centerline Direction Cosine VZ - <blank>
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For WRC 297, API 650, and PD 5500, if the centerlines of the nozzle and vessel are collinear, the software flags this as an error. Only nozzles that are perpendicular to the shell are allowed.
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PD 5500 allows nozzles on cylinders or spheres.
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Fax - Axial (Nozzle) (radial stiffness) Mi - In-plane Bending (longitudinal stiffness) Mo - Out-of-Plane Bending (circumferential stiffness) Mt - Torsional (Nozzle) (torsional stiffness) D - Direction cosine of shell |
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Represents a nozzle on any type of head. |
Fax - Axial (Nozzle) (radial stiffness) Mi - In-plane Bending (longitudinal stiffness) Mo - Out-of-Plane Bending (circumferential stiffness) Mt - Torsional (Nozzle) (torsional stiffness) D - Direction cosine of head |
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For the custom option you are not limited to radial nozzles. For Custom, you can directly define a lateral nozzle, a hillside nozzle, or a nozzle on the vessel head. The nozzle and vessel centerlines may be at varying angles to each other with a minimum angle of 20 degrees. The nozzle and vessel centerlines cannot be colinear.