Resetting Loads on Existing Spring Hangers - CAESAR II - Help

CAESAR II Users Guide

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English
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CAESAR II
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CAESAR II Version
13

If only the spring rate is given, CAESAR II assumes that you want to rerate the spring at the given location. The software reads the old spring rate from the existing hanger and inputs it directly to CAESAR II. Leave the Theoretical Cold Load box blank for the rerate. If more than a single spring exists at the location, then type the total number of springs in the No. of Hangers at Location box in the Design Data section. CAESAR II assumes that the load is distributed evenly among multiple springs at the same point.

CAESAR II goes through its normal hanger design procedure to calculate the load and travel for all proposed hanger locations including the location with springs to be reset. The stiffness of the reset springs is not used for this redesign. After CAESAR II sizes the springs, it makes a comparison with the user-defined spring rates. If the selected spring rate is within 5% of your existing spring rate, CAESAR II lists the spring's figure number and size in the output report. If the selected spring rate is more than 5% of your value, no manufacturer's data is listed. In either case, CAESAR II uses the spring rate that you typed in all following analyses. It is up to you to confirm that the new hot and cold loads are within the existing spring's working range.

The primary use of the rerate capability is to find new installed loads for old springs. Springs might be rerated after the shutdown of a unit that has been operating continuously for a long period, or after mechanical or process changes are made to a piping system.