In CII file ,the spring hanger was kept as Caesar defined and Free Restraint at the nozzle was used to pass nozzle of blower. The loads on the Springs were then input as user-defined spring to take some of the pipe weight off the blower nozzle so that the nozzle loads are within vendor's allowables In such a case what will happen is, the spring will push up the node at the spring application point and release the load on the blower nozzle.This load released from blower nozzle + what would have come at that point in normal case is then balanced by the higher spring load.

by using free restraint option in CII file springs near blower nozzle taking cold load 2400 kg & 2700 kg respectively. If springs are modelled as Caesar defined ( without free restraint option ) then these springs are taking cold load ( sustained load ) as 1100kg & 1700 kg.

so my question is whether spring will practically work ( take load of 2400 kg & 2700 kg respectively )on site by using free node option as given in CII file. or in reality spring will take cold load of 1100 kg & 1700 kg ( loads getting without free restraint opntion in CII )

i request you all to please advice on this issue.

Mate

The spring will take the designed load based on the spring rate & thermal movement & preset/installed load.

What you do while designing spring using "free restraint at node" option is instructing Caesar to design spring considering no restraint at that particular node (which means this extra load will now be carried by the spring).

The spring designed this way will be different from what the Caesar selects normally (presuming that the spring is not in the vicinity of the node to be freed).By this mean , I mean there may be a change of spring rate &/or installed load. You can check this by using the spring selected using free node as "user defined " spring. It will yield more or less same results as the earlier one.

Spring will behave the way (no doubts in it, provided things are done at site as per design) it is intended to unless there are not too many vagaries at site.

Hope this helps.