*******When I wrote that the expansion case is seeing a +Y load, I was trying to say that the Spring hangers were actually making the expansion case worse. They were being compressed when the pipe thermally grew up. The spring hangers were then pushing on the pipe rather than trying to support it up thus causing and even greater -Y force on the nozzle.*******




Hi Skrif

Yes spring can produce more operating load on nozzle ( Like your case).
You need to check flexibility beyond the spring. Probable case when you put a hold down or anchor support after spring. You may need to add one more spring support or need to add more elbow after first spring.

You may attached sketch or Caesar file so that I can offer your more help.
Mind that cold spring is very difficult & dangerous option, should be avoided as best as possible.

Regards

Habib
habibur21@gmail.com