Dear Samuel,

It is my personal experince share with you.

Normally, High pressure steam piping has always very high pressure and temperature. While analysis, even though supports are not lifting and take full loads of piping, please use at your selected Guide locations - Hold Down Guides, means the normal guide + rest locations use "Y" Restraint in CAESAR II Model, instead of "+Y" and normally in each contractor Support STD, there are Hold Down Guide Supports are always available.

AS you had said, no supports lifting, if there is no support lifting, there shall be no impact on Civil loads. But by using the HOLD DOWN GUIDE "Y" In CAESAR, it will help at SITE, the piping vertical expansion will be restricted by such supports.

Lines where Steam Out case or Nitrogen purging lines, this also can help you.

Please check as I had share my experience, it may help you.

Regards
SND