hmmm. The temp. for the trunnions are taken as 21 deg. C, as you can see the first large dia loop piping rests very well, this and above near by piping supports cause the adjacent loops to lift slightly. I used Y supports and absorbed there are no significant changes in stress and loads at the trunnion supports as well as near to the nozzle. So, it is not necessary to provide springs on the two trunnion supports. is it Mr. dan ?