Occasional Load Factor - CAESAR II - Help

CAESAR II Users Guide (2019 Service Pack 1)

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CAESAR II
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CAESAR II Version
11.0 (2019)

Specifies the occasional load factor. The default value of 0.0 tells CAESAR II to use the value that the active piping code recommends. B31.1 states that the calculated stress may exceed the maximum allowable stress from Appendix A, (Sh), by 15% if the event duration occurs less than 10% of any 24-hour operating period, and by 20% if the event duration occurs less than 1% of any 24-hour operating period. The default for B31.1 applications is 15%. If 20% is more suitable for the system being analyzed, then this option can be used to enter the 20%.

B31.3 states, "The sum of the longitudinal stresses due to pressure, weight, and other sustained loadings (S1) and of the stresses produced by occasional loads such as wind or earthquake may be as much as 1.33 times the allowable stress given in Appendix A. Where the allowable stress value exceeds 2/3 of yield strength at temperature, the allowable stress value must be reduced as specified in Note 3 in 302.3.2." The default for B31.3 applications is 33%. If this is too high for the material and temperature specified, then a smaller occasional load factor could be input.

This configuration option is used to send new job files. After the static load cases have been defined, changing this directive will have no effect for static analysis. For existing static load case definitions, change the occasional load multiplier on the Load Cases tab in the Static Analysis - Load Case Editor. Dynamic analyses will always reference this configuration option.