SIFs & Tees - CAESAR II - Help

CAESAR II Users Guide

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CAESAR II
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CAESAR II Version
13

Defines SIF and tee data. Select or clear by double-clicking B31J SIFs & Tees on the Classic Piping Input dialog.

  • By default, the software uses ASME B31J calculations. Where B31J is not applicable, such as for FRP codes, the display changes on the Classic Piping Input dialog.

  • You can change how the software applies B31J in the SIFs and Stresses Advanced Settings of the Configuration Editor.

The SIFs/Tees auxiliary panel tab controls options for stress intensification factors (SIFs), or fitting types, for up to two nodes per element. If you select components from the list, the software automatically calculates the SIF values according to the applicable code unless you override this behavior. Certain fittings and certain codes require additional data. Boxes display as appropriate for the selected fitting.

There are two basic component types:

  • Three element intersection components

  • Two element joint components

A fully defined intersection model requires that three pipes frame into the intersection node and that two of them are co-linear. Partial intersection assumptions are made for junctions where you have coded one or two pipes into the intersection node, but these models are not recommended. Two element joint components can be formed equally well with one or two elements framing into the node.

You only need to type the intersection or joint type and properties on one of the elements going to the junction. CAESAR II duplicates the intersection characteristics for all other pipes framing into the intersection.

  • B31J provides directional stress intensification factors and flexibility factors. The software uses the highest in-plane or out-of-plane SIF when the piping code defines a stress equation that uses a single SIF. The software uses the flexibility factors for the specified orientation.

  • See B31J for information on B31J geometric limits.

  • Fully review the warning messages coming from CAESAR II during error checking. These messages detail any assumptions made during the assembly and calculation of the intersection SIFs and flexibilities.

  • To view and change the stress intensification factors calculated by the software, use the Intersection SIF Scratchpad.