Post-Selection Load Case (Optional) – Setting the Actual Installed (Cold) Load - CAESAR II - Help

CAESAR II Users Guide

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

If you need to calculate actual hanger installed loads, the third analysis level combination case defines the weight configuration existing in the field when a spring is installed. Typically, this case includes weight without fluid contents and other live loads. The theoretical cold (installed) load, is the load on the spring when the unbalanced installed load is applied, and the pipe is not allowed to displace vertically (the load will be balanced when the pipe is in the operating or design position). The actual installed load may differ from the theoretical installed load by (K)(d), where (K) is the spring stiffness and (d) is the displacement of the pipe in the installed condition.

To calculate the actual installed load:

  1. Install the hangers.

  2. Apply the theoretical cold load and all other loads (for example, empty weight) that will be present when the springs are set.

  3. Calculate the position of all springs (d).

  4. Set the actual installed spring load based on this installed position (Installed Load = Theoretical Cold Load - (K)(d)).