Relief Load Synthesis - CAESAR II - Help

CAESAR II Users Guide

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CAESAR II
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CAESAR II Version
12

Relief Load Synthesis and Tools > Relief Load Synthesis calculates the magnitudes of relieving thrust forces. Dynamic forces associated with relieving devices can cause considerable mechanical damage to equipment and supports. There are two types of destructive dynamic forces associated with relief devices that must be evaluated:

  • Thrust at the valve/atmosphere interface.

  • Acoustic shock due to the sudden change in fluid momentum and the associated traveling pressure waves.

The first step in performing a relief load analysis is to compute the magnitudes of the relieving thrust forces. For open-type vent systems, use Relief Load Synthesis . Results are calculated for liquids and for gases greater than 15 psig.

This command is only available when Relief Loads (spectrum) and Time History are selected as Analysis Type.

The discussion here concerns only the thrust at the valve/atmosphere interface. Acoustic traveling pressure waves can be addressed similar to water hammer. For more information, see Relief Loads and Water Hammer/Slug Flow Spectra Analysis.