1) Please read the section on hanger design in Chapter 6 of the Technical Reference Manual. This explained there.

To summarize, the purpose of the spring hanger is to carry part of the "system weight", through all positions of the piping system. Temperature is not part of the weight, hence it is not included in the "restrained weight" case. Temperature affects hanger travel, so it is included in the "free thermal design case".


2) Go through "error checking" and look at the Center of Gravity report.