Nozzle Node - CAESAR II - Help

CAESAR II Users Guide

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CAESAR II
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CAESAR II Version
12

Specifies the node number located at the nozzle intersection with the vessel shell. There should only be a single piping element connected to this node. There should be no restraints acting on the node.

For WRC 297, API 650, and PD 5500, the nozzle element must be perpendicular to the vessel shell. If you want to model hillside nozzles and latrolets, the first (and possibly very short) nozzle element that comes from the vessel must be perpendicular to the vessel to keep the local stiffness properly oriented. The second, longer nozzle element can then go off on the true centerline of the nozzle.

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.

When you type a nozzle node number, CAESAR II scans the current input data for the node and fills the corresponding values in the Nozzle Outer Diameter and Nozzle Wall Thickness boxes.

A valid nozzle node has the following properties:

  • Only a single element connects to the nozzle node.

  • The nozzle node is unrestrained and does not have displacements specified for any of its degrees of freedom.

The software automatically includes nozzle flexibilities in the piping system analysis through software-generated restraints. CAESAR II establishes six restraints for each flexible nozzle input.

If you define a vessel node number, then the vessel node acts like a connecting node for each of the six restraints. Vessel nodes are subject to the same restrictions shown above for nozzle nodes.

You should not put a restraint or an element between the nozzle node and any specified vessel node. CAESAR II creates the required connectivity from the nozzle flexibility data and any additional stiffnesses between these two nodes erroneously add to the nozzle stiffnesses.