Load Case 2 – Setting Hanger Deflection through the Operating Case - CAESAR II - Help

CAESAR II Users Guide

Language
English
Product
CAESAR II
Search by Category
Help
CAESAR II Version
13

After the restrained weight case, CAESAR II runs an operating analysis. If there are multiple operating conditions, the software recommends the load cases it thinks you should run. This is a linear or a nonlinear analysis, as discussed below.

To find the hanger displacement, the software runs a linear analysis:

  1. Removes the Y-restraints at any anchors.

  2. Uses the calculated load from the restrained weight analysis and applies it as an upward force at each hanger location.

  3. Calculates the expected travel and additional load on the hanger.

    The vertical displacement of the operating case at a hanger location defines the travel of the hanger.

  4. Selects a hanger from the catalog meeting the calculated load and travel values.

If the analysis results in single directional restraints or gaps in the system and a changed status in the operating case, then the software redistributes the hanger loads. For example, as the temperature of a pipe increases, the pipe may lift from a single-direction restraint, such as the support shown in the following graphic. When this occurs, the hanger sees additional load.

.

For a nonlinear status change, such as a pipe lifting off a restraint, the software designs the hanger for Maximum Load:

  1. Reruns the restrained weight case with the restraints left as they were at the end of the operating case.

  2. Recalculates the new restraint loads.

  3. Runs another operating case.